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Clarify "gtile" in the bsub -gpu option for affinity job

Question & Answer


Question

When specify LSB_GPU_NEW_SYNTAX=extend in the lsf.conf file, you can specify "gtile" in bsub -gpu option. The gtile option is to specify the number of GPUs to use per socket. 

Using "gtile" option with -gpu resources requirement for an affinity job, the CPU affinity should be same as after removing "-gpu" resource requirement, that means using "gtile" option will not has any impact about CPU affinity. 

For example:

The two jobs below will get the same CPU affinity.

bsub -R "affinity[thread(1,exclusive=(core,injob|intask))*2:cpubind=thread:distribute=pack]span[ptile=4]" -n4 -gpu "gtile='!':j_exclusive=no:mode=shared:mps=no:num=4" job_app

bsub -R "affinity[thread(1,exclusive=(core,injob|intask))*2:cpubind=thread:distribute=pack]span[ptile=4]" -n4  job_app

 

More information about "gtile" option please refer the following URL.

https://www.ibm.com/support/knowledgecenter/SSWRJV_10.1.0/lsf_command_ref/bsub.gpu.1.html

 

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Document Information

Modified date:
25 December 2018

UID

ibm10787715

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