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Out of Memory Problem

Answered

Comments

12 comments

  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    Hi Vida,

    Please note that the NodefileStart parameter applies only if the out-of-memory error happens during the B&B tree. If your machine runs out of memory already before entering the B&B tree, i.e., before the root node has been solved, then a different workaround is needed.

    Please note that a model with ~140 million nonzeros is expected to require a lot of memory. How much memory does your machine have? Do you have the possibility to switch the a different machine, e.g., to a Cloud machine?

    Could you please share the full log output until the OOM error occurs?

    Best regards, 
    Jaromił

    0
  • Vida Yousefi Nezhad
    Curious
    Conversationalist

    Hi Jaromil,

    Thank you for your reply.

    The installed RAM is 8 GB, and the processor is 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz   2.61 GHz.  

    Also, the full log before the error is as follows:

    Gurobi Optimizer version 11.0.1 build v11.0.1rc0 (win64 - Windows 10.0 (19045.2))
    
    CPU model: 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz, instruction set [SSE2|AVX|AVX2|AVX512]
    Thread count: 4 physical cores, 8 logical processors, using up to 2 threads
    
    Optimize a model with 2048794 rows, 3263023 columns and 139451032 nonzeros
    Model fingerprint: 0xaf8ac214
    Model has 407694 general constraints
    Variable types: 3250528 continuous, 12495 integer (12495 binary)
    Coefficient statistics:
      Matrix range     [1e+00, 1e+03]
      Objective range  [1e+00, 3e+01]
      Bounds range     [1e+00, 1e+02]
      RHS range        [1e+00, 1e+03]
    Presolve removed 0 rows and 0 columns (presolve time = 49s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 64s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 76s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 89s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 127s) ...
    Presolve removed 968812 rows and 1908112 columns (presolve time = 133s) ...
    Presolve removed 1164580 rows and 1908112 columns (presolve time = 140s) ...
    Presolve removed 1165058 rows and 1908112 columns (presolve time = 140s) ...
    Presolve removed 1165058 rows and 2067497 columns (presolve time = 147s) ...
    Presolve removed 1166815 rows and 2067497 columns (presolve time = 151s) ...
    Presolve removed 1180389 rows and 2081071 columns (presolve time = 157s) ...
    Presolve removed 1188252 rows and 2338352 columns (presolve time = 167s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 181s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 205s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 213s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 222s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 225s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 231s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 265s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 270s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 276s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 280s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 285s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 290s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 295s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 300s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 305s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 310s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 315s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 347s) ...
    Presolve removed 1712084 rows and 2827962 columns (presolve time = 350s) ...
    Presolve removed 1720662 rows and 2827962 columns (presolve time = 355s) ...
    Presolve removed 1840235 rows and 2834975 columns (presolve time = 360s) ...
    Presolve removed 1845007 rows and 2845501 columns (presolve time = 365s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 370s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 375s) ...
    Presolve removed 1845045 rows and 2859064 columns (presolve time = 381s) ...
    Presolve removed 1845045 rows and 2878919 columns (presolve time = 387s) ...
    Presolve removed 1845045 rows and 2891932 columns (presolve time = 391s) ...
    Presolve removed 1845045 rows and 2911151 columns (presolve time = 397s) ...
    Presolve removed 1845045 rows and 2923588 columns (presolve time = 401s) ...
    Presolve removed 1845045 rows and 2941990 columns (presolve time = 407s) ...
    Presolve removed 1845045 rows and 2953930 columns (presolve time = 410s) ...
    Presolve removed 1845045 rows and 2971367 columns (presolve time = 416s) ...
    Presolve removed 1845045 rows and 2988364 columns (presolve time = 421s) ...
    Presolve removed 1845045 rows and 3004724 columns (presolve time = 426s) ...
    Presolve removed 1845045 rows and 3020267 columns (presolve time = 431s) ...
    Presolve removed 1845045 rows and 3035300 columns (presolve time = 436s) ...
    Presolve removed 1845045 rows and 3053545 columns (presolve time = 441s) ...
    Presolve removed 1845045 rows and 3065855 columns (presolve time = 445s) ...
    Presolve removed 1845045 rows and 3083591 columns (presolve time = 451s) ...
    Presolve removed 1845045 rows and 3098410 columns (presolve time = 455s) ...
    Presolve removed 1845045 rows and 3102111 columns (presolve time = 460s) ...
    Presolve removed 2103121 rows and 3106082 columns (presolve time = 465s) ...
    Presolve removed 2409305 rows and 3412266 columns (presolve time = 470s) ...
    Presolve removed 2674864 rows and 3675668 columns (presolve time = 475s) ...
    Presolve removed 878741 rows and 2136167 columns
    Presolve time: 475.65s
    Presolved: 1170053 rows, 1126856 columns, 9696825 nonzeros
    Variable types: 866643 continuous, 260213 integer (260213 binary)
    Deterministic concurrent LP optimizer: dual simplex and barrier
    Showing barrier log only...
    
    Root barrier log...
    
    Elapsed ordering time = 5s
    Elapsed ordering time = 10s
    Elapsed ordering time = 14s
    Elapsed ordering time = 15s
    Elapsed ordering time = 20s
    Ordering time: 22.12s
    
    Barrier statistics:
     Dense cols : 15
     Free vars  : 45
     AA' NZ     : 1.098e+07
     Factor NZ  : 1.037e+08 (roughly 1.6 GB of memory)
     Factor Ops : 1.004e+11 (roughly 3 seconds per iteration)
     Threads    : 1
    
                      Objective                Residual
    Iter       Primal          Dual         Primal    Dual     Compl     Time
       0   1.83775338e+08 -6.15473769e+08  1.97e+04 1.80e+03  1.51e+04   557s
       1   1.55390416e+08 -8.16831571e+08  1.69e+04 4.94e+02  1.28e+04   565s
       2   3.20182804e+07 -8.14414961e+08  3.50e+03 5.79e+01  2.87e+03   570s
       3   8.27115527e+06 -5.73148218e+08  8.72e+02 1.12e-02  8.01e+02   576s
       4   2.24820085e+06 -2.85363223e+08  1.87e+02 1.11e-03  2.16e+02   582s
       5   1.39919581e+06 -1.04191211e+08  9.03e+01 2.76e-04  7.53e+01   587s
       6   8.47649907e+05 -3.98578660e+07  3.46e+01 6.98e-05  2.62e+01   593s
       7   5.78132640e+05 -1.38941783e+07  1.05e+01 1.79e-05  8.28e+00   599s
       8   4.58973089e+05 -3.75018769e+06  1.67e+00 4.07e-06  2.10e+00   606s
       9   4.15132964e+05 -1.89983136e+06  6.26e-01 2.69e-06  1.10e+00   612s
      10   3.49963928e+05 -2.38882886e+05  1.63e-01 3.04e-06  2.69e-01   620s
      11   3.05654611e+05 -3.88577274e+03  7.11e-02 2.75e-06  1.40e-01   627s
      12   2.75467294e+05  1.21166127e+05  3.84e-02 2.17e-06  6.94e-02   634s
      13   2.48368514e+05  1.72641031e+05  1.72e-02 1.76e-06  3.39e-02   641s
      14   2.30878017e+05  1.90621514e+05  5.37e-03 1.37e-06  1.79e-02   647s
      15   2.26909277e+05  2.06599047e+05  3.54e-03 8.82e-07  9.07e-03   653s
      16   2.23936015e+05  2.14313984e+05  2.16e-03 4.73e-07  4.30e-03   658s
      17   2.22858838e+05  2.15381496e+05  1.72e-03 4.13e-07  3.35e-03   663s
      18   2.21462647e+05  2.17447689e+05  1.09e-03 2.67e-07  1.80e-03   669s
      19   2.20997675e+05  2.18014808e+05  8.85e-04 2.18e-07  1.34e-03   674s
      20   2.20300944e+05  2.18204067e+05  5.74e-04 2.53e-07  9.40e-04   679s
      21   2.19946753e+05  2.18569131e+05  4.18e-04 3.01e-07  6.19e-04   684s
      22   2.19614026e+05  2.18833510e+05  2.73e-04 3.01e-07  3.51e-04   689s
      23   2.19331164e+05  2.18926725e+05  1.55e-04 2.17e-07  1.82e-04   694s
      24   2.19108686e+05  2.18940424e+05  6.01e-05 2.85e-07  7.58e-05   700s
      25   2.18983385e+05  2.18959596e+05  1.04e-05 6.83e-08  1.08e-05   705s
      26   2.18968063e+05  2.18964772e+05  1.51e-06 5.60e-09  1.49e-06   711s
      27   2.18965430e+05  2.18965226e+05  4.66e-07 1.44e-09  9.17e-08   717s
      28   2.18965387e+05  2.18965252e+05  1.43e-06 6.68e-10  6.06e-08   723s
      29   2.18965384e+05  2.18965252e+05  3.64e-06 6.83e-10  5.94e-08   728s
      30   2.18965384e+05  2.18965252e+05  5.77e-06 6.84e-10  5.94e-08   734s
      31   2.18965384e+05  2.18965252e+05  1.02e-05 1.13e-09  5.92e-08   740s
      32   2.18965382e+05  2.18965251e+05  1.00e-05 3.26e-09  5.88e-08   745s
      33   2.18965363e+05  2.18965253e+05  8.44e-06 2.79e-09  4.94e-08   751s
      34   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08   757s
      35   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08   763s
      36   2.18965362e+05  2.18965253e+05  1.51e-05 2.88e-09  4.89e-08   769s
      37   2.18965362e+05  2.18965253e+05  2.31e-05 2.89e-09  4.89e-08   774s
      38   2.18965361e+05  2.18965252e+05  2.28e-05 6.45e-09  4.90e-08   780s
      39   2.18965347e+05  2.18965253e+05  1.97e-05 5.50e-09  4.23e-08   786s
      40   2.18965346e+05  2.18965253e+05  1.94e-05 5.42e-09  4.17e-08   792s
    
    Barrier performed 40 iterations in 792.31 seconds (408.59 work units)
    Barrier solve interrupted - model solved by another algorithm
    
    Concurrent spin time: 0.29s
    
    Solved with dual simplex
    
    Root simplex log...
    
    Iteration    Objective       Primal Inf.    Dual Inf.      Time
      789900    2.1896526e+05   0.000000e+00   0.000000e+00    795s
    Extra simplex iterations after uncrush: 2108
    
    Root relaxation: objective 2.189653e+05, 789900 iterations, 272.83 seconds (159.45 work units)
    Total elapsed time = 795.57s (DegenMoves)
    Total elapsed time = 810.34s (DegenMoves)
    
        Nodes    |    Current Node    |     Objective Bounds      |     Work
     Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time
    
         0     0 218965.260    0 1966          - 218965.260      -     -  816s
         0     0 221753.681    0 2400          - 221753.681      -     -  912s
         0     0 221757.817    0 2393          - 221757.817      -     -  943s
         0     0 221757.896    0 2392          - 221757.896      -     -  947s
         0     0 222976.728    0 1971          - 222976.728      -     - 1038s
         0     0 222976.728    0 1968          - 222976.728      -     - 1039s
         0     0 222977.005    0 1942          - 222977.005      -     - 1058s
         0     0 222999.565    0 1850          - 222999.565      -     - 1125s
         0     0 223000.315    0 1852          - 223000.315      -     - 1155s
         0     0 223000.315    0 1856          - 223000.315      -     - 1158s
         0     0 223011.508    0 1809          - 223011.508      -     - 1193s
         0     0 223011.779    0 1828          - 223011.779      -     - 1214s
         0     0 223012.826    0 1834          - 223012.826      -     - 1261s
         0     0 223012.826    0 1837          - 223012.826      -     - 1278s
         0     0 223013.282    0 1844          - 223013.282      -     - 1296s
         0     0 223013.282    0 1843          - 223013.282      -     - 1297s
         0     0 223013.359    0 1825          - 223013.359      -     - 1322s
         0     0 223013.373    0 1835          - 223013.373      -     - 1334s
         0     0 223013.399    0 1836          - 223013.399      -     - 1350s
         0     0 223013.579    0 1836          - 223013.579      -     - 1365s
         0     0 223013.673    0 1829          - 223013.673      -     - 1380s
         0     0 223013.849    0 1801          - 223013.849      -     - 1394s
         0     0 223013.849    0 1355          - 223013.849      -     - 1452s
         0     2 223013.849    0 1314          - 223013.849      -     - 1702s
         1     5 223013.849    1 1313          - 223013.849      -  2289 1706s
         3     6 223016.658    2 1342          - 223013.849      -  2986 1720s
         5     8 223013.849    2 1311          - 223013.849      -  1946 1725s
        11    14 223013.849    4 1313          - 223013.849      -  1126 1730s
        23    32 223013.849    9 1309          - 223013.849      -   637 1740s
        31    48 223013.849   11 1311          - 223013.849      -   655 1757s
        47    65 223013.849   19 1301          - 223013.849      -   589 1788s
    
    Cutting planes:
      Learned: 1
      Gomory: 16
      Lift-and-project: 12
      Implied bound: 124
      MIR: 1854
      Flow cover: 1997
      Flow path: 52
      RLT: 173
      Relax-and-lift: 236
    
    Explored 64 nodes (1324513 simplex iterations) in 1799.80 seconds (952.30 work units)
    Thread count was 2 (of 8 available processors)
    
    Solution count 0
    
    Solve interrupted (error code 10001)
    Best objective -, best bound 2.230138490788e+05, gap -
    0
  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    Thank you for sharing the output.

    I cannot see that the parameter NodefileStart has been actually set. Is this output just missing in your post?

    Do you have writing permissions on this machine? You can specify a particular location for the node files via the NodefileDir parameter.

    You could try setting Method=1 to use the Dual Simplex only.

    If you are setting the NodefileStart parameter, you could set it to a lower value. It is possible that already the root node takes most of the RAM and the B&B tree actually never reaches the 0.5GB threshold set by the NodefileStart parameter.

    Best regards, 
    Jaromił

    0
  • Vida Yousefi Nezhad
    Curious
    Conversationalist

    Sorry for the inconvenience. You can see the output in the following again. 

    What do you mean by writing permission? I guess you are asking about license. I am using academic license. 

    Set parameter NodefileStart to value 0.5
    Set parameter PreSparsify to value 1
    Set parameter Threads to value 2
    p: 365
    Length of dummy_matrix columns: 7
    Gurobi Optimizer version 11.0.1 build v11.0.1rc0 (win64 - Windows 10.0 (19045.2))
    
    CPU model: 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz, instruction set [SSE2|AVX|AVX2|AVX512]
    Thread count: 4 physical cores, 8 logical processors, using up to 2 threads
    
    Optimize a model with 2048794 rows, 3263023 columns and 139451032 nonzeros
    Model fingerprint: 0xaf8ac214
    Model has 407694 general constraints
    Variable types: 3250528 continuous, 12495 integer (12495 binary)
    Coefficient statistics:
      Matrix range     [1e+00, 1e+03]
      Objective range  [1e+00, 3e+01]
      Bounds range     [1e+00, 1e+02]
      RHS range        [1e+00, 1e+03]
    Presolve removed 0 rows and 0 columns (presolve time = 49s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 64s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 76s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 89s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 127s) ...
    Presolve removed 968812 rows and 1908112 columns (presolve time = 133s) ...
    Presolve removed 1164580 rows and 1908112 columns (presolve time = 140s) ...
    Presolve removed 1165058 rows and 1908112 columns (presolve time = 140s) ...
    Presolve removed 1165058 rows and 2067497 columns (presolve time = 147s) ...
    Presolve removed 1166815 rows and 2067497 columns (presolve time = 151s) ...
    Presolve removed 1180389 rows and 2081071 columns (presolve time = 157s) ...
    Presolve removed 1188252 rows and 2338352 columns (presolve time = 167s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 181s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 205s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 213s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 222s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 225s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 231s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 265s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 270s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 276s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 280s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 285s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 290s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 295s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 300s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 305s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 310s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 315s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 347s) ...
    Presolve removed 1712084 rows and 2827962 columns (presolve time = 350s) ...
    Presolve removed 1720662 rows and 2827962 columns (presolve time = 355s) ...
    Presolve removed 1840235 rows and 2834975 columns (presolve time = 360s) ...
    Presolve removed 1845007 rows and 2845501 columns (presolve time = 365s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 370s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 375s) ...
    Presolve removed 1845045 rows and 2859064 columns (presolve time = 381s) ...
    Presolve removed 1845045 rows and 2878919 columns (presolve time = 387s) ...
    Presolve removed 1845045 rows and 2891932 columns (presolve time = 391s) ...
    Presolve removed 1845045 rows and 2911151 columns (presolve time = 397s) ...
    Presolve removed 1845045 rows and 2923588 columns (presolve time = 401s) ...
    Presolve removed 1845045 rows and 2941990 columns (presolve time = 407s) ...
    Presolve removed 1845045 rows and 2953930 columns (presolve time = 410s) ...
    Presolve removed 1845045 rows and 2971367 columns (presolve time = 416s) ...
    Presolve removed 1845045 rows and 2988364 columns (presolve time = 421s) ...
    Presolve removed 1845045 rows and 3004724 columns (presolve time = 426s) ...
    Presolve removed 1845045 rows and 3020267 columns (presolve time = 431s) ...
    Presolve removed 1845045 rows and 3035300 columns (presolve time = 436s) ...
    Presolve removed 1845045 rows and 3053545 columns (presolve time = 441s) ...
    Presolve removed 1845045 rows and 3065855 columns (presolve time = 445s) ...
    Presolve removed 1845045 rows and 3083591 columns (presolve time = 451s) ...
    Presolve removed 1845045 rows and 3098410 columns (presolve time = 455s) ...
    Presolve removed 1845045 rows and 3102111 columns (presolve time = 460s) ...
    Presolve removed 2103121 rows and 3106082 columns (presolve time = 465s) ...
    Presolve removed 2409305 rows and 3412266 columns (presolve time = 470s) ...
    Presolve removed 2674864 rows and 3675668 columns (presolve time = 475s) ...
    Presolve removed 878741 rows and 2136167 columns
    Presolve time: 475.65s
    Presolved: 1170053 rows, 1126856 columns, 9696825 nonzeros
    Variable types: 866643 continuous, 260213 integer (260213 binary)
    Deterministic concurrent LP optimizer: dual simplex and barrier
    Showing barrier log only...
    
    Root barrier log...
    
    Elapsed ordering time = 5s
    Elapsed ordering time = 10s
    Elapsed ordering time = 14s
    Elapsed ordering time = 15s
    Elapsed ordering time = 20s
    Ordering time: 22.12s
    
    Barrier statistics:
     Dense cols : 15
     Free vars  : 45
     AA' NZ     : 1.098e+07
     Factor NZ  : 1.037e+08 (roughly 1.6 GB of memory)
     Factor Ops : 1.004e+11 (roughly 3 seconds per iteration)
     Threads    : 1
    
                      Objective                Residual
    Iter       Primal          Dual         Primal    Dual     Compl     Time
       0   1.83775338e+08 -6.15473769e+08  1.97e+04 1.80e+03  1.51e+04   557s
       1   1.55390416e+08 -8.16831571e+08  1.69e+04 4.94e+02  1.28e+04   565s
       2   3.20182804e+07 -8.14414961e+08  3.50e+03 5.79e+01  2.87e+03   570s
       3   8.27115527e+06 -5.73148218e+08  8.72e+02 1.12e-02  8.01e+02   576s
       4   2.24820085e+06 -2.85363223e+08  1.87e+02 1.11e-03  2.16e+02   582s
       5   1.39919581e+06 -1.04191211e+08  9.03e+01 2.76e-04  7.53e+01   587s
       6   8.47649907e+05 -3.98578660e+07  3.46e+01 6.98e-05  2.62e+01   593s
       7   5.78132640e+05 -1.38941783e+07  1.05e+01 1.79e-05  8.28e+00   599s
       8   4.58973089e+05 -3.75018769e+06  1.67e+00 4.07e-06  2.10e+00   606s
       9   4.15132964e+05 -1.89983136e+06  6.26e-01 2.69e-06  1.10e+00   612s
      10   3.49963928e+05 -2.38882886e+05  1.63e-01 3.04e-06  2.69e-01   620s
      11   3.05654611e+05 -3.88577274e+03  7.11e-02 2.75e-06  1.40e-01   627s
      12   2.75467294e+05  1.21166127e+05  3.84e-02 2.17e-06  6.94e-02   634s
      13   2.48368514e+05  1.72641031e+05  1.72e-02 1.76e-06  3.39e-02   641s
      14   2.30878017e+05  1.90621514e+05  5.37e-03 1.37e-06  1.79e-02   647s
      15   2.26909277e+05  2.06599047e+05  3.54e-03 8.82e-07  9.07e-03   653s
      16   2.23936015e+05  2.14313984e+05  2.16e-03 4.73e-07  4.30e-03   658s
      17   2.22858838e+05  2.15381496e+05  1.72e-03 4.13e-07  3.35e-03   663s
      18   2.21462647e+05  2.17447689e+05  1.09e-03 2.67e-07  1.80e-03   669s
      19   2.20997675e+05  2.18014808e+05  8.85e-04 2.18e-07  1.34e-03   674s
      20   2.20300944e+05  2.18204067e+05  5.74e-04 2.53e-07  9.40e-04   679s
      21   2.19946753e+05  2.18569131e+05  4.18e-04 3.01e-07  6.19e-04   684s
      22   2.19614026e+05  2.18833510e+05  2.73e-04 3.01e-07  3.51e-04   689s
      23   2.19331164e+05  2.18926725e+05  1.55e-04 2.17e-07  1.82e-04   694s
      24   2.19108686e+05  2.18940424e+05  6.01e-05 2.85e-07  7.58e-05   700s
      25   2.18983385e+05  2.18959596e+05  1.04e-05 6.83e-08  1.08e-05   705s
      26   2.18968063e+05  2.18964772e+05  1.51e-06 5.60e-09  1.49e-06   711s
      27   2.18965430e+05  2.18965226e+05  4.66e-07 1.44e-09  9.17e-08   717s
      28   2.18965387e+05  2.18965252e+05  1.43e-06 6.68e-10  6.06e-08   723s
      29   2.18965384e+05  2.18965252e+05  3.64e-06 6.83e-10  5.94e-08   728s
      30   2.18965384e+05  2.18965252e+05  5.77e-06 6.84e-10  5.94e-08   734s
      31   2.18965384e+05  2.18965252e+05  1.02e-05 1.13e-09  5.92e-08   740s
      32   2.18965382e+05  2.18965251e+05  1.00e-05 3.26e-09  5.88e-08   745s
      33   2.18965363e+05  2.18965253e+05  8.44e-06 2.79e-09  4.94e-08   751s
      34   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08   757s
      35   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08   763s
      36   2.18965362e+05  2.18965253e+05  1.51e-05 2.88e-09  4.89e-08   769s
      37   2.18965362e+05  2.18965253e+05  2.31e-05 2.89e-09  4.89e-08   774s
      38   2.18965361e+05  2.18965252e+05  2.28e-05 6.45e-09  4.90e-08   780s
      39   2.18965347e+05  2.18965253e+05  1.97e-05 5.50e-09  4.23e-08   786s
      40   2.18965346e+05  2.18965253e+05  1.94e-05 5.42e-09  4.17e-08   792s
    
    Barrier performed 40 iterations in 792.31 seconds (408.59 work units)
    Barrier solve interrupted - model solved by another algorithm
    
    Concurrent spin time: 0.29s
    
    Solved with dual simplex
    
    Root simplex log...
    
    Iteration    Objective       Primal Inf.    Dual Inf.      Time
      789900    2.1896526e+05   0.000000e+00   0.000000e+00    795s
    Extra simplex iterations after uncrush: 2108
    
    Root relaxation: objective 2.189653e+05, 789900 iterations, 272.83 seconds (159.45 work units)
    Total elapsed time = 795.57s (DegenMoves)
    Total elapsed time = 810.34s (DegenMoves)
    
        Nodes    |    Current Node    |     Objective Bounds      |     Work
     Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time
    
         0     0 218965.260    0 1966          - 218965.260      -     -  816s
         0     0 221753.681    0 2400          - 221753.681      -     -  912s
         0     0 221757.817    0 2393          - 221757.817      -     -  943s
         0     0 221757.896    0 2392          - 221757.896      -     -  947s
         0     0 222976.728    0 1971          - 222976.728      -     - 1038s
         0     0 222976.728    0 1968          - 222976.728      -     - 1039s
         0     0 222977.005    0 1942          - 222977.005      -     - 1058s
         0     0 222999.565    0 1850          - 222999.565      -     - 1125s
         0     0 223000.315    0 1852          - 223000.315      -     - 1155s
         0     0 223000.315    0 1856          - 223000.315      -     - 1158s
         0     0 223011.508    0 1809          - 223011.508      -     - 1193s
         0     0 223011.779    0 1828          - 223011.779      -     - 1214s
         0     0 223012.826    0 1834          - 223012.826      -     - 1261s
         0     0 223012.826    0 1837          - 223012.826      -     - 1278s
         0     0 223013.282    0 1844          - 223013.282      -     - 1296s
         0     0 223013.282    0 1843          - 223013.282      -     - 1297s
         0     0 223013.359    0 1825          - 223013.359      -     - 1322s
         0     0 223013.373    0 1835          - 223013.373      -     - 1334s
         0     0 223013.399    0 1836          - 223013.399      -     - 1350s
         0     0 223013.579    0 1836          - 223013.579      -     - 1365s
         0     0 223013.673    0 1829          - 223013.673      -     - 1380s
         0     0 223013.849    0 1801          - 223013.849      -     - 1394s
         0     0 223013.849    0 1355          - 223013.849      -     - 1452s
         0     2 223013.849    0 1314          - 223013.849      -     - 1702s
         1     5 223013.849    1 1313          - 223013.849      -  2289 1706s
         3     6 223016.658    2 1342          - 223013.849      -  2986 1720s
         5     8 223013.849    2 1311          - 223013.849      -  1946 1725s
        11    14 223013.849    4 1313          - 223013.849      -  1126 1730s
        23    32 223013.849    9 1309          - 223013.849      -   637 1740s
        31    48 223013.849   11 1311          - 223013.849      -   655 1757s
        47    65 223013.849   19 1301          - 223013.849      -   589 1788s
    
    Cutting planes:
      Learned: 1
      Gomory: 16
      Lift-and-project: 12
      Implied bound: 124
      MIR: 1854
      Flow cover: 1997
      Flow path: 52
      RLT: 173
      Relax-and-lift: 236
    
    Explored 64 nodes (1324513 simplex iterations) in 1799.80 seconds (952.30 work units)
    Thread count was 2 (of 8 available processors)
    
    Solution count 0
    
    Solve interrupted (error code 10001)
    Best objective -, best bound 2.230138490788e+05, gap -
    0
  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    What do you mean by writing permission? I guess you are asking about license. I am using academic license. 

    I mean whether you have permissions to generate and write into new files on the machine you are using. It is not correlated to your Gurobi license. If this is not your machine you are running on, then it is possible that you do have only reading permissions.

    You could try setting NodefileStart=0. This should start writing the node files as soon as the optimization reaches the B&B tree.

    Best regards, 
    Jaromił

    0
  • Vida Yousefi Nezhad
    Curious
    Conversationalist

    Dear Jaromil,

    Thank you for your help.

    I am using Jupyter Notebook on my laptop with an academic license. I tried setting NodefileStart = 0, but it did not work. I have got the same error. You can see below for more information. 

    Set parameter NodefileStart to value 0
    Set parameter PreSparsify to value 1
    Set parameter Threads to value 2
    p: 365
    Length of dummy_matrix columns: 7
    Gurobi Optimizer version 11.0.1 build v11.0.1rc0 (win64 - Windows 10.0 (19045.2))
    
    CPU model: 11th Gen Intel(R) Core(TM) i5-1145G7 @ 2.60GHz, instruction set [SSE2|AVX|AVX2|AVX512]
    Thread count: 4 physical cores, 8 logical processors, using up to 2 threads
    
    Optimize a model with 2048794 rows, 3263023 columns and 139451032 nonzeros
    Model fingerprint: 0xaf8ac214
    Model has 407694 general constraints
    Variable types: 3250528 continuous, 12495 integer (12495 binary)
    Coefficient statistics:
      Matrix range     [1e+00, 1e+03]
      Objective range  [1e+00, 3e+01]
      Bounds range     [1e+00, 1e+02]
      RHS range        [1e+00, 1e+03]
    Presolve removed 0 rows and 0 columns (presolve time = 71s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 92s) ...
    Presolve removed 0 rows and 0 columns (presolve time = 112s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 130s) ...
    Presolve removed 407670 rows and 1353006 columns (presolve time = 185s) ...
    Presolve removed 968812 rows and 1908112 columns (presolve time = 192s) ...
    Presolve removed 1164580 rows and 1908112 columns (presolve time = 223s) ...
    Presolve removed 1165058 rows and 1908590 columns (presolve time = 249s) ...
    Presolve removed 1165058 rows and 2067497 columns (presolve time = 258s) ...
    Presolve removed 1166815 rows and 2067497 columns (presolve time = 267s) ...
    Presolve removed 1166815 rows and 2067497 columns (presolve time = 283s) ...
    Presolve removed 1180389 rows and 2081071 columns (presolve time = 311s) ...
    Presolve removed 1180419 rows and 2081071 columns (presolve time = 327s) ...
    Presolve removed 1180419 rows and 2081071 columns (presolve time = 343s) ...
    Presolve removed 1180419 rows and 2081071 columns (presolve time = 346s) ...
    Presolve removed 1180419 rows and 2081071 columns (presolve time = 357s) ...
    Presolve removed 1188252 rows and 2338352 columns (presolve time = 368s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 385s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 385s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 412s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 423s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 429s) ...
    Presolve removed 1192582 rows and 2338352 columns (presolve time = 432s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 435s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 452s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 486s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 490s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 495s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 500s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 505s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 510s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 515s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 520s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 525s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 530s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 535s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 540s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 545s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 551s) ...
    Presolve removed 1237646 rows and 2353524 columns (presolve time = 606s) ...
    Presolve removed 1712084 rows and 2827962 columns (presolve time = 610s) ...
    Presolve removed 1720662 rows and 2827962 columns (presolve time = 615s) ...
    Presolve removed 1840235 rows and 2834975 columns (presolve time = 621s) ...
    Presolve removed 1844983 rows and 2839723 columns (presolve time = 625s) ...
    Presolve removed 1845006 rows and 2839723 columns (presolve time = 630s) ...
    Presolve removed 1845007 rows and 2845501 columns (presolve time = 635s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 640s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 645s) ...
    Presolve removed 1845045 rows and 2845539 columns (presolve time = 650s) ...
    Presolve removed 1845045 rows and 2859064 columns (presolve time = 658s) ...
    Presolve removed 1845045 rows and 2865669 columns (presolve time = 661s) ...
    Presolve removed 1845045 rows and 2878919 columns (presolve time = 668s) ...
    Presolve removed 1845045 rows and 2885484 columns (presolve time = 672s) ...
    Presolve removed 1845045 rows and 2898384 columns (presolve time = 678s) ...
    Presolve removed 1845045 rows and 2904757 columns (presolve time = 682s) ...
    Presolve removed 1845045 rows and 2911151 columns (presolve time = 685s) ...
    Presolve removed 1845045 rows and 2923588 columns (presolve time = 692s) ...
    Presolve removed 1845045 rows and 2935948 columns (presolve time = 698s) ...
    Presolve removed 1845045 rows and 2941990 columns (presolve time = 701s) ...
    Presolve removed 1845045 rows and 2953930 columns (presolve time = 708s) ...
    Presolve removed 1845045 rows and 2959803 columns (presolve time = 711s) ...
    Presolve removed 1845045 rows and 2971367 columns (presolve time = 717s) ...
    Presolve removed 1845045 rows and 2982784 columns (presolve time = 722s) ...
    Presolve removed 1845045 rows and 2988364 columns (presolve time = 725s) ...
    Presolve removed 1845045 rows and 2999435 columns (presolve time = 731s) ...
    Presolve removed 1845045 rows and 3010002 columns (presolve time = 736s) ...
    Presolve removed 1845045 rows and 3020267 columns (presolve time = 742s) ...
    Presolve removed 1845045 rows and 3030349 columns (presolve time = 747s) ...
    Presolve removed 1845045 rows and 3039998 columns (presolve time = 752s) ...
    Presolve removed 1845045 rows and 3049152 columns (presolve time = 757s) ...
    Presolve removed 1845045 rows and 3057801 columns (presolve time = 762s) ...
    Presolve removed 1845045 rows and 3065855 columns (presolve time = 766s) ...
    Presolve removed 1845045 rows and 3076997 columns (presolve time = 772s) ...
    Presolve removed 1845045 rows and 3083591 columns (presolve time = 776s) ...
    Presolve removed 1845045 rows and 3092074 columns (presolve time = 780s) ...
    Presolve removed 1845045 rows and 3101750 columns (presolve time = 785s) ...
    Presolve removed 1845045 rows and 3102111 columns (presolve time = 790s) ...
    Presolve removed 1845045 rows and 3102111 columns (presolve time = 795s) ...
    Presolve removed 2102221 rows and 3105182 columns (presolve time = 800s) ...
    Presolve removed 2103121 rows and 3106082 columns (presolve time = 805s) ...
    Presolve removed 2409305 rows and 3412266 columns (presolve time = 810s) ...
    Presolve removed 2409422 rows and 3412266 columns (presolve time = 815s) ...
    Presolve removed 878741 rows and 2136167 columns
    Presolve time: 819.81s
    Presolved: 1170053 rows, 1126856 columns, 9696825 nonzeros
    Variable types: 866643 continuous, 260213 integer (260213 binary)
    Deterministic concurrent LP optimizer: dual simplex and barrier
    Showing barrier log only...
    
    Root barrier log...
    
    Elapsed ordering time = 5s
    Elapsed ordering time = 10s
    Elapsed ordering time = 15s
    Elapsed ordering time = 20s
    Elapsed ordering time = 23s
    Elapsed ordering time = 25s
    Elapsed ordering time = 30s
    Elapsed ordering time = 35s
    Ordering time: 38.00s
    
    Barrier statistics:
     Dense cols : 15
     Free vars  : 45
     AA' NZ     : 1.098e+07
     Factor NZ  : 1.037e+08 (roughly 1.6 GB of memory)
     Factor Ops : 1.004e+11 (roughly 3 seconds per iteration)
     Threads    : 1
    
                      Objective                Residual
    Iter       Primal          Dual         Primal    Dual     Compl     Time
       0   1.83775338e+08 -6.15473769e+08  1.97e+04 1.80e+03  1.51e+04   960s
       1   1.55390416e+08 -8.16831571e+08  1.69e+04 4.94e+02  1.28e+04   974s
       2   3.20182804e+07 -8.14414961e+08  3.50e+03 5.79e+01  2.87e+03   983s
       3   8.27115527e+06 -5.73148218e+08  8.72e+02 1.12e-02  8.01e+02   992s
       4   2.24820085e+06 -2.85363223e+08  1.87e+02 1.11e-03  2.16e+02  1001s
       5   1.39919581e+06 -1.04191211e+08  9.03e+01 2.76e-04  7.53e+01  1011s
       6   8.47649907e+05 -3.98578660e+07  3.46e+01 6.98e-05  2.62e+01  1020s
       7   5.78132640e+05 -1.38941783e+07  1.05e+01 1.79e-05  8.28e+00  1031s
       8   4.58973089e+05 -3.75018769e+06  1.67e+00 4.07e-06  2.10e+00  1042s
       9   4.15132964e+05 -1.89983136e+06  6.26e-01 2.69e-06  1.10e+00  1053s
      10   3.49963928e+05 -2.38882886e+05  1.63e-01 3.04e-06  2.69e-01  1067s
      11   3.05654611e+05 -3.88577274e+03  7.11e-02 2.75e-06  1.40e-01  1079s
      12   2.75467294e+05  1.21166127e+05  3.84e-02 2.17e-06  6.94e-02  1091s
      13   2.48368514e+05  1.72641031e+05  1.72e-02 1.76e-06  3.39e-02  1102s
      14   2.30878017e+05  1.90621514e+05  5.37e-03 1.37e-06  1.79e-02  1113s
      15   2.26909277e+05  2.06599047e+05  3.54e-03 8.82e-07  9.07e-03  1123s
      16   2.23936015e+05  2.14313984e+05  2.16e-03 4.73e-07  4.30e-03  1132s
      17   2.22858838e+05  2.15381496e+05  1.72e-03 4.13e-07  3.35e-03  1141s
      18   2.21462647e+05  2.17447689e+05  1.09e-03 2.67e-07  1.80e-03  1149s
      19   2.20997675e+05  2.18014808e+05  8.85e-04 2.18e-07  1.34e-03  1157s
      20   2.20300944e+05  2.18204067e+05  5.74e-04 2.53e-07  9.40e-04  1165s
      21   2.19946753e+05  2.18569131e+05  4.18e-04 3.01e-07  6.19e-04  1173s
      22   2.19614026e+05  2.18833510e+05  2.73e-04 3.01e-07  3.51e-04  1182s
      23   2.19331164e+05  2.18926725e+05  1.55e-04 2.17e-07  1.82e-04  1190s
      24   2.19108686e+05  2.18940424e+05  6.01e-05 2.85e-07  7.58e-05  1199s
      25   2.18983385e+05  2.18959596e+05  1.04e-05 6.83e-08  1.08e-05  1208s
      26   2.18968063e+05  2.18964772e+05  1.51e-06 5.60e-09  1.49e-06  1218s
      27   2.18965430e+05  2.18965226e+05  4.66e-07 1.44e-09  9.17e-08  1228s
      28   2.18965387e+05  2.18965252e+05  1.43e-06 6.68e-10  6.06e-08  1238s
      29   2.18965384e+05  2.18965252e+05  3.64e-06 6.83e-10  5.94e-08  1248s
      30   2.18965384e+05  2.18965252e+05  5.77e-06 6.84e-10  5.94e-08  1257s
      31   2.18965384e+05  2.18965252e+05  1.02e-05 1.13e-09  5.92e-08  1267s
      32   2.18965382e+05  2.18965251e+05  1.00e-05 3.26e-09  5.88e-08  1277s
      33   2.18965363e+05  2.18965253e+05  8.44e-06 2.79e-09  4.94e-08  1287s
      34   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08  1297s
      35   2.18965363e+05  2.18965253e+05  8.41e-06 2.78e-09  4.92e-08  1308s
      36   2.18965362e+05  2.18965253e+05  1.51e-05 2.88e-09  4.89e-08  1318s
      37   2.18965362e+05  2.18965253e+05  2.31e-05 2.89e-09  4.89e-08  1327s
      38   2.18965361e+05  2.18965252e+05  2.28e-05 6.45e-09  4.90e-08  1337s
    
    Barrier performed 38 iterations in 1338.06 seconds (398.93 work units)
    Barrier solve interrupted - model solved by another algorithm
    
    Concurrent spin time: 0.93s
    
    Solved with dual simplex
    
    Root simplex log...
    
    Iteration    Objective       Primal Inf.    Dual Inf.      Time
      789900    2.1896526e+05   0.000000e+00   0.000000e+00   1342s
    Extra simplex iterations after uncrush: 2108
    
    Root relaxation: objective 2.189653e+05, 789900 iterations, 441.77 seconds (159.45 work units)
    Total elapsed time = 1343.24s (DegenMoves)
    Total elapsed time = 1369.31s (DegenMoves)
    Total elapsed time = 1377.06s (DegenMoves)
    
        Nodes    |    Current Node    |     Objective Bounds      |     Work
     Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time
    
         0     0 218965.260    0 1966          - 218965.260      -     - 1380s
         0     0 221753.681    0 2400          - 221753.681      -     - 1544s
         0     0 221757.817    0 2393          - 221757.817      -     - 1596s
         0     0 221757.896    0 2392          - 221757.896      -     - 1602s
         0     0 222976.728    0 1971          - 222976.728      -     - 1758s
         0     0 222976.728    0 1968          - 222976.728      -     - 1759s
         0     0 222977.005    0 1942          - 222977.005      -     - 1791s
         0     0 222999.565    0 1850          - 222999.565      -     - 1911s
         0     0 223000.315    0 1852          - 223000.315      -     - 1963s
         0     0 223000.315    0 1856          - 223000.315      -     - 1967s
         0     0 223011.508    0 1809          - 223011.508      -     - 2029s
         0     0 223011.779    0 1828          - 223011.779      -     - 2063s
         0     0 223012.826    0 1834          - 223012.826      -     - 2150s
         0     0 223012.826    0 1837          - 223012.826      -     - 2178s
         0     0 223013.282    0 1844          - 223013.282      -     - 2210s
         0     0 223013.282    0 1843          - 223013.282      -     - 2211s
         0     0 223013.359    0 1825          - 223013.359      -     - 2253s
         0     0 223013.373    0 1835          - 223013.373      -     - 2276s
         0     0 223013.399    0 1836          - 223013.399      -     - 2303s
         0     0 223013.579    0 1836          - 223013.579      -     - 2330s
         0     0 223013.673    0 1829          - 223013.673      -     - 2354s
         0     0 223013.849    0 1801          - 223013.849      -     - 2377s
         0     0 223013.849    0 1355          - 223013.849      -     - 2477s
         0     2 223013.849    0 1314          - 223013.849      -     - 2899s
         1     5 223013.849    1 1313          - 223013.849      -  2289 2905s
         3     6 223016.658    2 1342          - 223013.849      -  2986 2928s
         5     8 223013.849    2 1311          - 223013.849      -  1946 2935s
        11    14 223013.849    4 1313          - 223013.849      -  1126 2943s
        15    18 223013.849    6 1310          - 223013.849      -   924 2947s
        17    24 223013.849    7 1311          - 223013.849      -   828 2950s
        23    32 223013.849    9 1309          - 223013.849      -   637 2959s
        31    48 223013.849   11 1311          - 223013.849      -   655 2987s
    
    Cutting planes:
      Learned: 1
      Gomory: 16
      Lift-and-project: 12
      Implied bound: 124
      MIR: 1854
      Flow cover: 1997
      Flow path: 52
      RLT: 173
      Relax-and-lift: 236
    
    Explored 47 nodes (1302946 simplex iterations) in 3010.43 seconds (922.96 work units)
    Thread count was 2 (of 8 available processors)
    
    Solution count 0
    
    Solve interrupted (error code 10001)
    Best objective -, best bound 2.230138490788e+05, gap -

    Regards,

    Vida

    0
  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    Hi Vida,

    You could try setting Method=0 or 1 and reducing the Threads parameter to 1. If this also does not help, then I think that unfortunately the only option remaining is to switch to a machine with more memory.

    Alternatively, you could try to reduce the model size. Depending on the application, this may not be possible.

    Best regards, 
    Jaromił

    0
  • Vida Yousefi Nezhad
    Curious
    Conversationalist

    Hi Jaromil,

    Thanks for your comment and sorry for my late response. 

    I have to change my machine. Could you please guide me on choosing the best machine that suits my optimization problem? 

    Regards,

    Vida

    0
  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    Hi Vida,

    For you models I would recommend at least 64GB RAM. You can find more information in the Knowledge Base article How does Gurobi perform on different computer hardware?

    You could use a cloud machine. Those are usually very strong with enough RAM and you might get some discount as a student.

    Best regards, 
    Jaromił

    0
  • Vida Yousefi Nezhad
    Curious
    Conversationalist

    Hi Jaromil,

    Thank you for your response. Could you please guide me on using cloud machine service? I am using Python. Now, I am using the following CPU on another machine, but I am not sure if it will be helpful or not. 

    CPU model: Intel(R) Xeon(R) Platinum 8488C, instruction set [SSE2|AVX|AVX2|AVX512]
    Thread count: 16 physical cores, 32 logical processors, using up to 32 threads

    Regards,

    Vida

    0
  • Jaromił Najman
    Gurobi Staff Gurobi Staff

    Hi Vida,

    The Knowledge Base article How do I switch to using Gurobi Instant Cloud? provides the steps to use Gurobi in an Instant Cloud. I would only recommend switching to a Cloud machine if you do not have access to a different machine with enough RAM.

    Now, I am using the following CPU on another machine, but I am not sure if it will be helpful or not. 

    The CPU looks fine. For your application it is important to have enough memory. How much RAM does the machine have? As mentioned before, 64GB should be enough for you. Anything more than that cannot hurt either.

    Best regards, 
    Jaromił

    0
  • Gwyneth Butera
    Gurobi Staff Gurobi Staff

    For users with academic licenses, please see What are the options for using an academic license on the cloud?

    0

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