Details
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Bug
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Resolution: Unresolved
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Minor
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None
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Lustre 2.15.2
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None
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Rocky linux 8.7-ib, Lustre 15.2.2, 1 OSS / 4 OST , single client
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3
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9223372036854775807
Description
Lustre is configured with small configuration 1 OSS /4 OST
During single threaded buffered test with IOR I noticed high system CPU usage and spinlock contention at between IOR and ptlrpcd.
buffered ior executed like below:
ior -F -w -b 64g -t 256m -e -o /lustre/
This seems expected that during the buffered test there is high pressure on pagecache but I wonder if this spinlock contention between IOR and ptlrpcd can be somehow avoided.
Additionally I did direct IO test and as expected I do not see any lock contention but
direct io test:
ior -b 64g -t 256m -e -w -r -o /lustre/iorfile --posix.odirect
During direct IO test there is no contention (as expected) but IOR still consumes a lot of CPU time due to memory operations.
