Introduce QMC_DISABLE_HIP_HOST_REGISTER. ON by default. #4674
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prckent
previously approved these changes
Jul 14, 2023
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It will be interesting to see if this helps or hinders the full range of system sizes run in the nightlies. |
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Test this please |
ye-luo
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ye-luo
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Test this please |
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Proposed changes
Since rocm 5.6. hipHostRegister becomes terribly slow https://github.com/ye-luo/miniqmc/wiki/hip-hsa-issues.
Introduce QMC_DISABLE_HIP_HOST_REGISTER. which can be used to make hipHostRegister no-op.
I set it ON by default for now. Will go through a few nights of performance test runs.
My guess is that it makes runs slower because we lose more from not using pinned memory than slower hipHostRegister in close to production benchmarks.
What type(s) of changes does this code introduce?
Does this introduce a breaking change?
What systems has this change been tested on?
epyc-server
Checklist