From: Stefan Beller <sbeller@google.com>
To: Jeff King <peff@peff.net>
Cc: gennady.kupava@gmail.com, git <git@vger.kernel.org>,
Gennady Kupava <gkupava@bloomberg.net>
Subject: Re: [PATCH] Reduce performance penalty for turned off traces
Date: Wed, 15 Nov 2017 11:14:20 -0800 [thread overview]
Message-ID: <CAGZ79kb4Eo0AC4Z42_ks5_+Pcy4DrDCufNb=5J=g8L6pMnHd7A@mail.gmail.com> (raw)
In-Reply-To: <20171112141737.nmnsygm4wrhtkqwb@sigill.intra.peff.net>
On Sun, Nov 12, 2017 at 6:17 AM, Jeff King <peff@peff.net> wrote:
> On Sat, Nov 11, 2017 at 07:28:58PM +0000, gennady.kupava@gmail.com wrote:
>
>> From: Gennady Kupava <gkupava@bloomberg.net>
>>
>> Signed-off-by: Gennady Kupava <gkupava@bloomberg.net>
>
> Thanks, and welcome to the list.
Welcome to the list!
> I did manually disable HAVE_VARIADIC_MACROS and confirmed that the
> result builds and passes the test suite (though I suspect that GIT_TRACE
> is not well exercised by the suite).
GIT_TRACE is exercised in the test suite (though I am not sure if it counts
as well-exercised) in t7406-submodule-update.sh for example, which uses
GIT_TRACE to obtain information about thread parallelism used by Git, as
that is not observable otherwise, if we assume that performance tests in the
standard test suite are not feasible.
> I tried timing a simple loop like:
> ....
> Without your patch, the times for GIT_TRACE=1 and GIT_TRACE=0 are about
> 500ms and 9ms respectively.
>
> After your patch, the GIT_TRACE=1 time remains the same but GIT_TRACE=0
> drops to 1ms.
So does that mean we can use a lot more tracing now?
Thanks,
Stefan
next prev parent reply other threads:[~2017-11-15 19:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-11 19:28 [PATCH] Reduce performance penalty for turned off traces gennady.kupava
2017-11-12 14:17 ` Jeff King
2017-11-12 23:24 ` Gennady Kupava
2017-11-17 22:12 ` Jeff King
2017-11-15 19:14 ` Stefan Beller [this message]
2017-11-17 22:16 ` Jeff King
2017-11-19 0:42 ` [PATCH 1/2] Simplify tracing code by removing trace key normalization concept gennady.kupava
2017-11-19 0:42 ` [PATCH 2/2] Reduce performance cost of the trace if trace category is disabled gennady.kupava
2017-11-19 8:27 ` Johannes Sixt
2017-11-19 13:18 ` Gennady Kupava
2017-11-19 2:19 ` [PATCH 1/2] Simplify tracing code by removing trace key normalization concept Junio C Hamano
2017-11-19 13:16 ` Gennady Kupava
2017-11-20 0:24 ` Junio C Hamano
2017-11-20 4:59 ` Junio C Hamano
2017-11-26 20:11 ` [PATCH 1/2] trace: remove trace key normalization gennady.kupava
2017-11-26 20:11 ` [PATCH 2/2] trace: improve performance while category is disabled gennady.kupava
2017-11-27 1:21 ` Junio C Hamano
2017-11-27 1:32 ` Junio C Hamano
2017-11-27 3:25 ` Junio C Hamano
2017-11-27 10:12 ` Gennady Kupava
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