How to prevent using more threads than cores in Gurobi Cloud
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I'm evaluating Gurobi Instant Cloud (to make it transparent to my current installation with local license), but I'm wondering whether we are starting too many/too few threads on the cloud servers.
Our cloud environment is currently configured as:
Compute Servers = 1
Job Limit = 1
And our C code looks like this:
status = GRBsetintparam(GRBgetenv(m_model), GRB_INT_PAR_THREADS, 0);
Considering those settings:
- How many threads will be effectively run (suppose we use a c5.4xlarge machine, 8 cores/16 threads according to the specs)? What about if we set N instead of 0 (N <= 8)?
- Do those threads will be run in a single processor (understading as processor each execution thread in the CPU, not each core) (we certainly want to avoid this situation)? Or each thread will be run in a separate processor?
Thanks for your help.
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1) Gurobi will use up to 16 threads on on a c5.4xlarge machine. If you set a thread count less than 16, Threads=N, Gurobi will use up to N threads.
2) In hyper-threaded machines such as a c5.4xlarge machine, there are two threads per core, managed by the operating system.
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