[gpfsug-discuss] tuning parameters question

Aaron Knister aaron.s.knister at nasa.gov
Mon Sep 11 01:43:56 BST 2017


Hi All (but mostly Sven),

I stumbled across this great gem:

files.gpfsug.org/presentations/2014/UG10_GPFS_Performance_Session_v10.pdf

and I'm wondering which, if any, of those tuning parameters are still 
relevant with the 4.2.3 code. Specifically for a CNFS cluster. I'm 
exporting a gpfs fs as an NFS root to 1k nodes. The boot storm is 
particularly ugly and the storage doesn't appear to be bottlenecked.

I see a lot of waiters like these:

Waiting 0.0009 sec since 20:41:31, monitored, thread 2881 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 26231 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 26146 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 18637 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 25013 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 27879 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 26553 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 25334 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'
Waiting 0.0009 sec since 20:41:31, monitored, thread 25337 
InodePrefetchWorkerThread: on ThCond 0x1800635A120 (LkObjCondvar), 
reason 'waiting for LX lock'

and I'm wondering if there's anything immediate one would suggest to 
help with that.

-Aaron

-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776



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