Re: [HPDD-discuss] Large number of sync requests
by Dilger, Andreas
What does strace of the application show? The clients also keep track of sync operations:
lctl get_param {osc,mdc}.*.stats | grep sync
and also the time it takes these operations to complete. For my OSTs it is about 25ms (SATA HDD), and the MDT it is about 3ms (old SSD).
If the application is issuing a lot of sync requests, not much that can be done about it except fix the app.
Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel High Performance Data Division
On 2016/02/17, 09:16, "HPDD-discuss on behalf of Kumar, Amit" <hpdd-discuss-bounces(a)lists.01.org<mailto:hpdd-discuss-bounces@lists.01.org> on behalf of ahkumar(a)mail.smu.edu<mailto:ahkumar@mail.smu.edu>> wrote:
Dear All,
I am noticing large number of sync requests originating from the jobs. And I am trying to understand the numbers.
I handpicked a few below from the output of “lctl get_param mdt.scratch-MDT0000.job_stats” from MDS. Strangely when I run try to get job_stats from all OSS for all OST’s I don’t see these high sync requests, rather it is 0.
My question why would I see these many sync requests, even if it is cumulative it is high for a job that runs for couple of hours at the most.
Can any body please shed some light on what I am seeing here?
Thank you,
Amit
- job_id: 7819402
snapshot_time: 1455722134
open: { samples: 632, unit: reqs }
close: { samples: 484, unit: reqs }
mknod: { samples: 0, unit: reqs }
link: { samples: 0, unit: reqs }
unlink: { samples: 0, unit: reqs }
mkdir: { samples: 0, unit: reqs }
rmdir: { samples: 0, unit: reqs }
rename: { samples: 0, unit: reqs }
getattr: { samples: 58, unit: reqs }
setattr: { samples: 0, unit: reqs }
getxattr: { samples: 0, unit: reqs }
setxattr: { samples: 0, unit: reqs }
statfs: { samples: 0, unit: reqs }
sync: { samples: 1183934, unit: reqs }
samedir_rename: { samples: 0, unit: reqs }
crossdir_rename: { samples: 0, unit: reqs }
- job_id: 7819409
snapshot_time: 1455722644
open: { samples: 738, unit: reqs }
close: { samples: 572, unit: reqs }
mknod: { samples: 0, unit: reqs }
link: { samples: 0, unit: reqs }
unlink: { samples: 0, unit: reqs }
mkdir: { samples: 0, unit: reqs }
rmdir: { samples: 0, unit: reqs }
rename: { samples: 0, unit: reqs }
getattr: { samples: 66, unit: reqs }
setattr: { samples: 0, unit: reqs }
getxattr: { samples: 0, unit: reqs }
setxattr: { samples: 0, unit: reqs }
statfs: { samples: 0, unit: reqs }
sync: { samples: 1396655, unit: reqs }
samedir_rename: { samples: 0, unit: reqs }
crossdir_rename: { samples: 0, unit: reqs }
5 years, 8 months
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5 years, 8 months
Large number of sync requests
by Kumar, Amit
Dear All,
I am noticing large number of sync requests originating from the jobs. And I am trying to understand the numbers.
I handpicked a few below from the output of "lctl get_param mdt.scratch-MDT0000.job_stats" from MDS. Strangely when I run try to get job_stats from all OSS for all OST's I don't see these high sync requests, rather it is 0.
My question why would I see these many sync requests, even if it is cumulative it is high for a job that runs for couple of hours at the most.
Can any body please shed some light on what I am seeing here?
Thank you,
Amit
- job_id: 7819402
snapshot_time: 1455722134
open: { samples: 632, unit: reqs }
close: { samples: 484, unit: reqs }
mknod: { samples: 0, unit: reqs }
link: { samples: 0, unit: reqs }
unlink: { samples: 0, unit: reqs }
mkdir: { samples: 0, unit: reqs }
rmdir: { samples: 0, unit: reqs }
rename: { samples: 0, unit: reqs }
getattr: { samples: 58, unit: reqs }
setattr: { samples: 0, unit: reqs }
getxattr: { samples: 0, unit: reqs }
setxattr: { samples: 0, unit: reqs }
statfs: { samples: 0, unit: reqs }
sync: { samples: 1183934, unit: reqs }
samedir_rename: { samples: 0, unit: reqs }
crossdir_rename: { samples: 0, unit: reqs }
- job_id: 7819409
snapshot_time: 1455722644
open: { samples: 738, unit: reqs }
close: { samples: 572, unit: reqs }
mknod: { samples: 0, unit: reqs }
link: { samples: 0, unit: reqs }
unlink: { samples: 0, unit: reqs }
mkdir: { samples: 0, unit: reqs }
rmdir: { samples: 0, unit: reqs }
rename: { samples: 0, unit: reqs }
getattr: { samples: 66, unit: reqs }
setattr: { samples: 0, unit: reqs }
getxattr: { samples: 0, unit: reqs }
setxattr: { samples: 0, unit: reqs }
statfs: { samples: 0, unit: reqs }
sync: { samples: 1396655, unit: reqs }
samedir_rename: { samples: 0, unit: reqs }
crossdir_rename: { samples: 0, unit: reqs }
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5 years, 8 months