| To: | Linux fs XFS <xfs@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: xfs - high CPU usage when removing files |
| From: | Stefan Ring <stefanrin@xxxxxxxxx> |
| Date: | Tue, 14 May 2013 13:11:02 +0200 |
| Cc: | Radoslaw Garbacz <radoslaw.garbacz@xxxxxxxxxxxxxxxxx> |
| Delivered-to: | xfs@xxxxxxxxxxx |
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| In-reply-to: | <20130514004751.GQ32675@dastard> |
| References: | <CAHBw7oSxcTYEEFzzhpZfH_EshyYXOsRBpf=S+bLEgCyQZkLFsA@xxxxxxxxxxxxxx> <20130514004751.GQ32675@dastard> |
>> I noticed a high CPU usage when removing files from XFS partition on Linux,
>> CentOS (always close to 100%).
>> Is it a known issue, or is it more likely to be attributed to my testing
>> methodology ('time' command)?
>
> If you are removing extremely fragmented files, then 100% CPU will
> be seen. If you are removing tens of thousands of small files, then
> 100% CPU will be seen,
>
> IOWs, if there's enough work to be done, removing files will use all
> the available CPU. There's no problem with that.
Also, removing huge files which are completely in cache (recently
written, for example) will use considerable CPU time.
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