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Re: notification output bottleneck

From: Branko ─îibej <brane_at_wandisco.com>
Date: Thu, 30 Aug 2012 09:45:50 +0200

On 30.08.2012 09:40, Daniel Shahaf wrote:
> Johan Corveleyn wrote on Thu, Aug 30, 2012 at 09:11:08 +0200:
>> On Wed, Aug 29, 2012 at 4:22 AM, Justin Erenkrantz
>> <justin_at_erenkrantz.com> wrote:
>>> On Tue, Aug 28, 2012 at 7:22 PM, Johan Corveleyn <jcorvel_at_gmail.com> wrote:
>>>> Yep, redirecting to a file eliminates the bottleneck (almost the same
>>>> as redirecting to NUL) (I ran it a couple of times to make sure the
>>>> server cache was hot):
>>> FWIW, I've historically seen similar behavior on Unix platforms as
>>> well - especially on machines with SSDs and a fast local network as
>>> the stdout I/O to emit the notifications is the slowest part of the
>>> system by far. -- justin
>> Hmz, so contrary to what I thought it seems it's not only a problem on
>> Windows. Is is as severe on *nix as on Windows? My export (w/ fast
>> server over a LAN) was twice as fast when redirecting notifications to
>> a file. Can somebody get some numbers on some unixy platform?
>>
>> But more to the point: anybody have a solution in mind? If it's not
>> Windows-only then some Windows defines wont help of course.
> Does not follow. Windows defines won't fix the Unix problem but might
> fix the Windows problem.

And it would definitely complicate the build, because these functions
are in libsvn_subr and you for sure do not want to compile a separate
version of that for use by the cmdline client and other single-threaded
apps, just because we already know that output to terminal windows is
horribly slow on modern systems (compared to other bits).

-- Brane

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Received on 2012-08-30 09:46:26 CEST

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