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From: Christian Couder <>
To: Jeff King <>
Cc: git <>, "Junio C Hamano" <>,
	"Thomas Rast" <>,
	"Ævar Arnfjörð Bjarmason" <>,
	"Christian Couder" <>
Subject: Re: [PATCH v1 0/4] Teach 'run' perf script to read config files
Date: Wed, 26 Jul 2017 17:58:09 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, Jul 14, 2017 at 8:27 AM, Christian Couder
<> wrote:
> On Thu, Jul 13, 2017 at 10:55 PM, Jeff King <> wrote:
>> On Thu, Jul 13, 2017 at 08:57:01PM +0200, Christian Couder wrote:
>>> >> We want to make it possible to store the parameters to the 'run'
>>> >> script in a config file. This will make it easier to store, reuse,
>>> >> share and compare parameters.
>>> >
>>> > Because perf-lib is built on test-lib, it already reads
>>> Actually the 'run' script also sources GIT-BUILD-OPTIONS, so maybe
>>> this is not necessary.
>> Ah, right. The one that comes via perf-lib gets the variables into the
>> test scripts themselves. But anything "run" would need itself would come
>> from the source it does itself. And that's where GIT_PERF_MAKE_OPTS has
>> an effect.
>>> Also are the variables in GIT-BUILD-OPTIONS exported already?
>> No, I don't think so. But because both "run" and the scripts themselves
>> source them, they're available more or less everywhere, except for
>> sub-processes inside the scripts.
> Ok, I see.

Actually after taking another look at that, it looks like the following happens:

1) the run script sources the original GIT-BUILD-OPTIONS file from
../.. relative to its location
2) a git version is built in "build/$rev" using GIT_PERF_MAKE_OPTS
which generates a new GIT-BUILD-OPTIONS file in "build/$rev/"
3) when the actual perf scripts are run they source the original
GIT-BUILD-OPTIONS file (through which sources

I wonder how useful 1) is, as the variables sourced from original
GIT-BUILD-OPTIONS are not used inside the "run" script and not
available to its child processes as they are not exported.
Is it just so that if people add GIT_PERF_* variables to their
config.mak before building they can then have those variables used by
the run script?

I also wonder if it would be better at step 3) to source the
GIT-BUILD-OPTIONS file generated at step 2) instead of the original
one, because they can be different as the options in
$GIT_PERF_MAKE_OPTS will be baked into the new GIT-BUILD-OPTIONS file.
(Of course if $GIT_PERF_MAKE_OPTS was added to config.mak before
building, then they will be in the original one too. But
$GIT_PERF_MAKE_OPTS should work without that.)

  parent reply	other threads:[~2017-07-26 15:58 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-13  6:50 [PATCH v1 0/4] Teach 'run' perf script to read config files Christian Couder
2017-07-13  6:50 ` [PATCH v1 1/4] perf/run: add '--config' option to the 'run' script Christian Couder
2017-07-13  6:50 ` [PATCH v1 2/4] perf/run: add get_var_from_env_or_config() Christian Couder
2017-07-13  6:50 ` [PATCH v1 3/4] perf/run: add GIT_PERF_DIRS_OR_REVS Christian Couder
2017-07-13  6:50 ` [PATCH v1 4/4] perf/run: add calls to get_var_from_env_or_config() Christian Couder
2017-07-13 16:58 ` [PATCH v1 0/4] Teach 'run' perf script to read config files Jeff King
2017-07-13 18:29   ` Junio C Hamano
2017-07-13 18:40     ` Jeff King
2017-07-13 19:21       ` Junio C Hamano
2017-07-13 19:45       ` Christian Couder
2017-07-13 18:57   ` Christian Couder
2017-07-13 20:55     ` Jeff King
2017-07-14  6:27       ` Christian Couder
2017-07-14  8:05         ` Jeff King
2017-07-26 15:58         ` Christian Couder [this message]
2017-07-26 16:54           ` Jeff King

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