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From: Mathieu Othacehe <othacehe@gnu.org>
To: Ricardo Wurmus <rekado@elephly.net>
Cc: 51787@debbugs.gnu.org
Subject: bug#51787: Disk performance on ci.guix.gnu.org
Date: Mon, 20 Dec 2021 17:59:33 +0100	[thread overview]
Message-ID: <87o85bjjpm.fsf@gnu.org> (raw)
In-Reply-To: <875yrjpi1y.fsf@elephly.net> (Ricardo Wurmus's message of "Mon, 20 Dec 2021 13:32:33 +0100")


Hey,

> This is still pretty bad, but better than the <1M performance suggested
> by previous runs.

Mmh interesting, I also have a x10 speed up on sdb by increasing the
block size from 4k to 512k. I'm not sure what conclusion should we draw
from this observation.

In particular for our most urging matter, /gnu/store/trash
removal. Moving to a faster hard drive would definitely help here, but I
still don't understand if that disk performance regression comes from
Linux, the file-system fragmentation, or the disk itself.

>    READ: bw=1547MiB/s (1622MB/s), 1547MiB/s-1547MiB/s (1622MB/s-1622MB/s), io=3055MiB (3203MB), run=1975-1975msec
>   WRITE: bw=527MiB/s (553MB/s), 527MiB/s-527MiB/s (553MB/s-553MB/s), io=1042MiB (1092MB), run=1975-1975msec

Wooh that's fast! On test could be to copy the /gnu/store/trash content
to the SAN an observe how long that it takes for this operating to
complete.

Thanks for your support on that complex topic :)

Mathieu




       reply	other threads:[~2021-12-20 18:02 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <875yrjpi1y.fsf@elephly.net>
2021-12-20 16:59 ` Mathieu Othacehe [this message]
2021-12-20 17:05   ` bug#51787: Disk performance on ci.guix.gnu.org Ricardo Wurmus
2021-12-20 21:53     ` Mathieu Othacehe
2021-12-21 17:26       ` Ricardo Wurmus
2021-12-21 17:51         ` Leo Famulari
2021-12-21 18:23         ` Mathieu Othacehe
2021-12-21 23:20         ` Bengt Richter
2021-12-22  0:27         ` Thiago Jung Bauermann via Bug reports for GNU Guix
2021-12-25 22:19         ` Ricardo Wurmus
2021-12-26  8:53           ` Mathieu Othacehe
2021-12-30 10:44             ` Ricardo Wurmus
2021-12-20 18:36   ` Bengt Richter

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