Large MILP problem

Answered

Ritesh Bhalerao

August 15, 2023 04:18 Edited

• 
• 
• 

Gurobi Optimizer version 10.0.2 build v10.0.2rc0 (win64) CPU model: 12th Gen Intel(R) Core(TM) i5-12450H, instruction set [SSE2|AVX|AVX2]

Thread count: 8 physical cores, 12 logical processors, using up to 12 threads 
Optimize a model with 12094 rows, 11707957 columns and 35094853 nonzeros 
Model fingerprint: 0x2c2ebb25 
Model has 14508 general constraints 
Variable types: 11700703 continuous, 7254 integer (7254 binary) 
Coefficient statistics: 
 Matrix range [1e+00, 1e+00] 
 Objective range [2e-01, 1e+09]
 Bounds range [3e-03, 1e+00]
 RHS range [2e-04, 3e+05]
 GenCon const rng [1e+00, 1e+00]
Presolve removed 0 rows and 0 columns (presolve time = 6s) ... 
Presolve added 17569188 rows and 35109360 columns 
Presolve time: 30.17s 
Explored 0 nodes (0 simplex iterations) in 33.21 seconds (7.01 work units) 
Thread count was 1 (of 12 available processors) 
Solution count 0 
Best objective -, best bound -, gap - 
--------------------------------------------------------------------------- 
GurobiError Traceback (most recent call last) Input In [47], 
in <cell line: 1>() ----> 1 m.optimize() File src\gurobipy\model.pxi:878, 
in gurobipy.Model.optimize() GurobiError: Out of memory

Is it even possible to solve this. If yes how do I proveed 

Related to

• Memory

0

• 

  Simranjit Kaur

  • Gurobi Staff

  August 15, 2023 07:21

  Please have a look at our Knowledge base article on tips to avoid an out-of-memory problem with Gurobi: How do I avoid an out-of-memory condition?

  0
• 

  Ritesh Bhalerao

  August 15, 2023 12:15

  • 
  • 
  • 

  Thank you for your response,
  I just need to ask can the following system specs be able to handle this problem
  GPU Card: NVIDIA 10800 Pytorch
  SSD Memory: 1500 GB
  GPU Memory: 80 GB
  Ram : 115 GB
  OS: Ubuntu 20.04
  vCPU : 16

  0
• 

  Silke Horn

  • Gurobi Staff

  August 15, 2023 13:00

  Hi Ritesh,

  From the log snippet you posted above, it is impossible to predict how difficult it is to solve the model, but many of our users are solving models of similar sizes.

  115 GB of memory sounds like a good amount to give this model a try.
  (As I've mentioned in your other post, Gurobi does not use the GPU; see here for details.)

  - Silke

  0

Please sign in to leave a comment.