markdown/gh_discussions/Runtime/5273.md

Different results locally(laptop, say 32 threads) and on the server(128 threads)

Tool: Global Placement

Subcategory: Parallelization issues

Conversation

oharboe

Q: what happens if we have different number of cores? Should we expect different results after make place even if we use manual placement?

I suppose OpenROAD can use all available CPUs and not heed NUM_CORES in ORFS, so even if I set NUM_CORES to the same, that might not help me get the exact same results?

I would expect partitioning to affect the results, is this true?

If so, can I choose the same partitioning even if NUM_CORES differ?

Any thoughts on different results locally and on the server in terms of what is expected behavior?

QuantamHD

It might be this issue https://github.com/The-OpenROAD-Project/OpenROAD/pull/5234

oharboe

For now my assumption is a PEBCAK: that I am running two different versions of OpenROAD in CI and locally(multiple levels of docker hell).

I tried locally with a single level of docker and got the same results on two machines and varying NUM_CORES.

maliberty

fwiw https://github.com/The-OpenROAD-Project/OpenROAD/pull/5234 is merged