Messages in this thread | | | Subject | Postal 56% waits for flock_lock_file_wait | Date | Fri, 29 Sep 2006 19:36:05 +0400 | From | "Ananiev, Leonid I" <> |
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A benchmark 'postal -p 16 localhost list_of_1000_users' 56% of run time waits for flock_lock_file_wait; Vmstat reports that 66% cpu is idle and vmstat bi+bo=3600 (far from max). Postfix server with FD_SETSIZE=2048 was used. Similar results got for sendmail. Wchan is counted by while :; do ps -o user,wchan=WIDE-WCHAN-COLUMN,comm; sleep 1; done | awk '/ postfix /{a[$2]++}END{for (i in a) print a[i]"\t"i}' If ext2 fs is used the Postal throughput is twice more and bi+bo by 50% less while flock_lock_file_wait 60% still.
Is flock_lock_file_wait considered as a performance limiting waiting for similar applications in smp?
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