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From: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
To: "Daniel P. Berrangé" <berrange@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>
Cc: "Kyle Evans" <kevans@freebsd.org>,
	qemu-devel@nongnu.org,
	"Wainer dos Santos Moschetta" <wainersm@redhat.com>,
	"Willian Rampazzo" <willianr@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Warner Losh" <imp@bsdimp.com>
Subject: Re: [PATCH v3 4/6] gitlab-ci: Add ccache in $PATH and display statistics
Date: Fri, 21 May 2021 14:27:26 +0200	[thread overview]
Message-ID: <c7f01111-bada-49b1-ebce-03e6eff96aae@amsat.org> (raw)
In-Reply-To: <YKefRcVrr9Gtehlk@redhat.com>

On 5/21/21 1:53 PM, Daniel P. Berrangé wrote:
> On Fri, May 21, 2021 at 01:02:51PM +0200, Thomas Huth wrote:
>> On 21/05/2021 12.50, Daniel P. Berrangé wrote:
>>> On Fri, May 21, 2021 at 12:48:21PM +0200, Thomas Huth wrote:
>>>> On 20/05/2021 13.27, Philippe Mathieu-Daudé wrote:
>>>>> +Stefan/Daniel
>>>>>
>>>>> On 5/20/21 10:02 AM, Thomas Huth wrote:
>>>>>> On 19/05/2021 20.45, Philippe Mathieu-Daudé wrote:
>>>>>>> If a runner has ccache installed, use it and display statistics
>>>>>>> at the end of the build.
>>>>>>>
>>>>>>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>>>>>>> ---
>>>>>>>     .gitlab-ci.d/buildtest-template.yml | 5 +++++
>>>>>>>     1 file changed, 5 insertions(+)
>>>>>>>
>>>>>>> diff --git a/.gitlab-ci.d/buildtest-template.yml
>>>>>>> b/.gitlab-ci.d/buildtest-template.yml
>>>>>>> index f284d7a0eec..a625c697d3b 100644
>>>>>>> --- a/.gitlab-ci.d/buildtest-template.yml
>>>>>>> +++ b/.gitlab-ci.d/buildtest-template.yml
>>>>>>> @@ -6,13 +6,18 @@
>>>>>>>           then
>>>>>>>             JOBS=$(sysctl -n hw.ncpu)
>>>>>>>             MAKE=gmake
>>>>>>> +        PATH=/usr/local/libexec/ccache:$PATH
>>>>>>>             ;
>>>>>>>           else
>>>>>>>             JOBS=$(expr $(nproc) + 1)
>>>>>>>             MAKE=make
>>>>>>> +        PATH=/usr/lib/ccache:/usr/lib64/ccache:$PATH
>>>>>>
>>>>>> That does not make sense for the shared runners yet. We first need
>>>>>> something to enable the caching there - see my series "Use ccache in the
>>>>>> gitlab-CI" from April (which is currently stalled unfortunately).
>>>>>
>>>>> TL;DR: I don't think we should restrict our templates to shared runners.
>>>>
>>>> I'm certainly not voting for restricting ourselves to only use shared
>>>> runners here - but my concern is that this actually *slows* down the shared
>>>> runners even more! (sorry, I should have elaborated on that in my previous
>>>> mail already)
>>>>
>>>> When I was experimenting with ccache in the shared runners, I saw that the
>>>> jobs are running even slower with ccache enabled as long as the cache is not
>>>> populated yet. You only get a speedup afterwards. So if you add this now
>>>> without also adding the possibility to store the cache persistently, the
>>>> shared runners will try to populate the cache each time just to throw away
>>>> the results afterwards again. Thus all the shared runners only get slower
>>>> without any real benefit here.
>>>>
>>>> Thus we either need to get ccache working properly for the shared runners
>>>> first, or you have to think of a different way of enabling ccache for the
>>>> non-shared runners, so that it does not affect the shared runners
>>>> negatively.
>>>
>>> Is there anything functional holding up your previous full cccache support
>>> series from last month ? Or is it just lack of reviews ?
>>
>> It's basically the problems mentioned in the cover letter and Stefan's
>> comment here:
>>
>>  https://lists.gnu.org/archive/html/qemu-devel/2021-04/msg02219.html
> 
> I'm not sure I understand why Stefan thinks gitlab's caching doesn't
> benefit ccache. We add ccache for libvirt GitLab CI, and AFAIR it
> sped up our builds significantly.

I think Stefan is referring to a comment I made, when using both
shared runners and dedicated runners (what I'm currently testing)
various jobs are stuck transferring artifacts/cache {FROM, TO}
{shared, dedicated} runners at the same time, which is sub-optimal
because it saturate the dedicated runner network link.

If we want to use pool of runners to restrict transfer between
runners from the same physical pool, then it because a maintenance
headache.


  reply	other threads:[~2021-05-21 12:30 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 18:45 [PATCH v3 0/6] gitlab-ci: Allow using FreeBSD runners Philippe Mathieu-Daudé
2021-05-19 18:45 ` [PATCH v3 1/6] gitlab-ci: Extract &environment_variables template Philippe Mathieu-Daudé
2021-05-19 19:12   ` Willian Rampazzo
2021-05-20 18:00   ` Wainer dos Santos Moschetta
2021-05-19 18:45 ` [PATCH v3 2/6] gitlab-ci: Adapt JOBS variable for FreeBSD runners Philippe Mathieu-Daudé
2021-05-19 19:11   ` Willian Rampazzo
2021-05-20  5:50   ` Thomas Huth
2021-05-20 18:18   ` Wainer dos Santos Moschetta
2021-05-20 20:02     ` Warner Losh
2021-05-19 18:45 ` [PATCH v3 3/6] gitlab-ci: Run GNU make via the $MAKE variable Philippe Mathieu-Daudé
2021-05-19 19:10   ` Willian Rampazzo
2021-05-20  7:56   ` Thomas Huth
2021-05-20 18:26   ` Wainer dos Santos Moschetta
2021-05-19 18:45 ` [PATCH v3 4/6] gitlab-ci: Add ccache in $PATH and display statistics Philippe Mathieu-Daudé
2021-05-19 19:14   ` Willian Rampazzo
2021-05-20  8:02   ` Thomas Huth
2021-05-20 11:27     ` Philippe Mathieu-Daudé
2021-05-21 10:48       ` Thomas Huth
2021-05-21 10:50         ` Daniel P. Berrangé
2021-05-21 11:02           ` Thomas Huth
2021-05-21 11:53             ` Daniel P. Berrangé
2021-05-21 12:27               ` Philippe Mathieu-Daudé [this message]
2021-05-21 12:52                 ` Daniel P. Berrangé
2021-05-21 14:21                   ` Philippe Mathieu-Daudé
2021-05-25  5:49                     ` Philippe Mathieu-Daudé
2021-05-24 13:51                   ` Stefan Hajnoczi
2021-05-25  5:50                     ` Philippe Mathieu-Daudé
2021-05-21 12:36             ` Willian Rampazzo
2021-05-21 13:02               ` Thomas Huth
2021-05-19 18:45 ` [PATCH v3 5/6] gitlab-ci: Simplify before/after script for Avocado based jobs Philippe Mathieu-Daudé
2021-05-19 19:42   ` Willian Rampazzo
2021-05-20  8:04   ` Thomas Huth
2021-05-19 18:45 ` [PATCH v3 6/6] gitlab-ci: Add FreeBSD jobs Philippe Mathieu-Daudé
2021-05-19 19:43   ` Willian Rampazzo

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