* syncfs slower than without syncfs
@ 2012-11-07 9:41 Stefan Priebe - Profihost AG
2012-11-07 13:31 ` Stefan Priebe - Profihost AG
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Priebe - Profihost AG @ 2012-11-07 9:41 UTC (permalink / raw)
To: ceph-devel@vger.kernel.org
Hello list,
syncfs is much slower than without syncfs to me.
If i compile latest ceph master with wip-rbd-read:
with syncfs:
rand 4K:
write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec
read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec
seq 4M:
write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec
read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec
without syncfs:
rand 4K:
write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec
read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec
seq 4M:
write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec
read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec
I thought syncfs should boost the performance.
Greets,
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: syncfs slower than without syncfs
2012-11-07 9:41 syncfs slower than without syncfs Stefan Priebe - Profihost AG
@ 2012-11-07 13:31 ` Stefan Priebe - Profihost AG
2012-11-07 15:04 ` Mark Nelson
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Priebe - Profihost AG @ 2012-11-07 13:31 UTC (permalink / raw)
To: ceph-devel@vger.kernel.org
Am 07.11.2012 10:41, schrieb Stefan Priebe - Profihost AG:
> Hello list,
>
> syncfs is much slower than without syncfs to me.
>
> If i compile latest ceph master with wip-rbd-read:
>
> with syncfs:
> rand 4K:
> write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec
> read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec
> seq 4M:
> write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec
> read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec
>
> without syncfs:
> rand 4K:
> write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec
> read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec
> seq 4M:
> write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec
> read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec
>
> I thought syncfs should boost the performance.
Fixed - my chroot env with glibc syncfs support didn't had the libcrypto
installed and it isn't in the control dependencies. Now with libcrypto i
get the same results as without syncfs.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: syncfs slower than without syncfs
2012-11-07 13:31 ` Stefan Priebe - Profihost AG
@ 2012-11-07 15:04 ` Mark Nelson
2012-11-07 16:26 ` Stefan Priebe
0 siblings, 1 reply; 6+ messages in thread
From: Mark Nelson @ 2012-11-07 15:04 UTC (permalink / raw)
To: Stefan Priebe - Profihost AG; +Cc: ceph-devel@vger.kernel.org
Whew, glad you found the problem Stefan! I was starting to wonder what
was going on. :) Do you mind filling a bug about the control dependencies?
Mark
On 11/07/2012 07:31 AM, Stefan Priebe - Profihost AG wrote:
> Am 07.11.2012 10:41, schrieb Stefan Priebe - Profihost AG:
>> Hello list,
>>
>> syncfs is much slower than without syncfs to me.
>>
>> If i compile latest ceph master with wip-rbd-read:
>>
>> with syncfs:
>> rand 4K:
>> write: io=1133MB, bw=12853KB/s, iops=3213, runt= 90277msec
>> read : io=1239MB, bw=14046KB/s, iops=3511, runt= 90325msec
>> seq 4M:
>> write: io=37560MB, bw=423874KB/s, iops=103, runt= 90738msec
>> read : io=103852MB, bw=1151MB/s, iops=287, runt= 90237msec
>>
>> without syncfs:
>> rand 4K:
>> write: io=3733MB, bw=42459KB/s, iops=10614, runt= 90039msec
>> read : io=6018MB, bw=68446KB/s, iops=17111, runt= 90038msec
>> seq 4M:
>> write: io=51204MB, bw=577328KB/s, iops=140, runt= 90820msec
>> read : io=150320MB, bw=1666MB/s, iops=416, runt= 90228msec
>>
>> I thought syncfs should boost the performance.
>
> Fixed - my chroot env with glibc syncfs support didn't had the libcrypto
> installed and it isn't in the control dependencies. Now with libcrypto i
> get the same results as without syncfs.
>
> Stefan
> --
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-11-08 8:52 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-11-07 9:41 syncfs slower than without syncfs Stefan Priebe - Profihost AG
2012-11-07 13:31 ` Stefan Priebe - Profihost AG
2012-11-07 15:04 ` Mark Nelson
2012-11-07 16:26 ` Stefan Priebe
2012-11-08 3:09 ` Josh Durgin
2012-11-08 8:52 ` Stefan Priebe - Profihost AG
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