Re: lgwr/dbw0 did not issue pwrite64 sys call

From: Sidney Chen <huanshengchen_at_gmail.com>
Date: Sun, 27 Nov 2011 10:59:05 +0800
Message-ID: <CAM_ddu_8qc+j3MobVQ1vSqSUmj4wM2av0P-TD+7ntLsWyfOLVA_at_mail.gmail.com>

Freek,
There is no AIO system call, io_submit and io_getevents. I wonder if there any way to identify which process is actually take care the Physical IO.

oracle 16376 1 0 Nov14 ? 00:16:36 ora_lgwr_testsid $ strace -c -f -S time -p 16376
Process 16376 attached - interrupt to quit Process 16376 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------

 73.72    0.116262         222       523           read
 20.97    0.033069         109       304        59 semtimedop
  2.24    0.003530          14       260           kill
  1.89    0.002981           2      1199           times
  1.06    0.001674           8       203           semctl
  0.04    0.000068           1        58           getrusage
  0.03    0.000054          14         4           semop
  0.02    0.000036          12         3           open
  0.01    0.000009           9         1           sendmsg
  0.00    0.000005           2         3           close
  0.00    0.000003           1         4           rt_sigprocmask
  0.00    0.000003           3         1         1 rt_sigreturn
  0.00    0.000003           2         2           setitimer


------ ----------- ----------- --------- --------- ----------------

100.00    0.157697                  2565        60 total

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Regards
Sidney Chen

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http://www.freelists.org/webpage/oracle-l Received on Sat Nov 26 2011 - 20:59:05 CST