From: Sébastien Cantos (scantos@technodiva.com)
Date: Tue Mar 30 2004 - 10:46:38 EST
Hello, Is there any tuning expert that can help me analyse this output from
lockstat ?
I've been told that spending 174455370 ns in ufs_dirlook is very long.
Have you any experience with this ?
I have a performance problem with this box and I'm trying to find where it
is.
Thanks in advance for your answers.
bash-2.00# lockstat -e 4,5,6,7 sleep 10
R/W writer blocked by writer: 15 events
Count indv cuml rcnt nsec Lock Caller
----------------------------------------------------------------------------
---
8 53% 53% 1.00 178582005 0x7b784de0 write+0x88
6 40% 93% 1.00 174140796 0x79289cd0 ufs_remove+0x11c
1 7% 100% 1.00 156451713 0x796e5918 ufs_rename+0x2c4
----------------------------------------------------------------------------
---
R/W writer blocked by readers: 9 events
Count indv cuml rcnt nsec Lock Caller
----------------------------------------------------------------------------
---
4 44% 44% 1.00 39398 kas+0x1c as_map+0x44
2 22% 67% 1.00 45546 kas+0x1c as_unmap+0x40
1 11% 78% 1.00 51352620 0x7b784de0 write+0x88
1 11% 89% 1.00 35207 0x700da7cc mir_wsrv+0x1b4
1 11% 100% 1.00 76729 0x796e5918 ufs_rename+0x2c4
----------------------------------------------------------------------------
---
R/W reader blocked by writer: 30 events
Count indv cuml rcnt nsec Lock Caller
----------------------------------------------------------------------------
---
12 40% 40% 1.00 125038 0x700da7cc mir_wsrv+0x14
6 20% 60% 1.00 174455370 0x79289cd0 ufs_dirlook+0xc4
3 10% 70% 1.00 36545477 0x78e6ac28 ufs_dirlook+0xc4
2 7% 77% 1.00 8064859 0x79bf03c0 ufs_dirlook+0xc4
2 7% 83% 1.00 4756371 0x796e5918 ufs_dirlook+0xc4
1 3% 87% 1.00 256200053 0x79289cd4 ufs_getattr+0x50
1 3% 90% 1.00 34608171 0x7b784de0 readv+0xec
1 3% 93% 1.00 20729 kas+0x1c as_pagelock+0x10
1 3% 97% 1.00 568432 0x717a301c ufs_getpage+0x280
1 3% 100% 1.00 757174098 0x796e5918 getdents64+0xbc
----------------------------------------------------------------------------
---
--
Sibastien Cantos <scantos@technodiva.com>
Responsable riseau et systhmes
Neopost DIVA
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