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Re: Proposal: new fsfs.conf properties

From: Branko ─îibej <brane_at_apache.org>
Date: Fri, 14 Jul 2017 14:18:09 +0200

On 14.07.2017 13:59, Paul Hammant wrote:
> I'd like to weigh in with some perf stats on that ever-changing 15GB
> file, but I can't:
>
> With TMPDIR same drive as Svn's root dir: sometime 6mins, sometimes
> 14 mins for the PUT.
> With TMPDIR different drive as Svn's root dir: sometime 6mins,
> sometimes 14 mins for the PUT.
> I can't prove or disprove the benefit of that env var setting.
>
> I have compression-level = 0 at the moment, and have filled the drive
> to the 3.4TB level (now full) which isn't pertinent to the question
> posed, I guess.

In fact it might be. A full filesystem may have a harder time finding
contiguous empty space, which may translate to more separate
(non-contiguous) writes for the same amount of data, which will have a
measurable effect even on an SSD where seek time is effectively zero,
but IOPS are not free.

-- Brane
Received on 2017-07-14 14:18:14 CEST

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