Date: Tue, 18 Oct 2022 12:09:31 -0500
From: Justin Pryzby <pryzby@telsasoft.com>
To: Andres Freund <andres@anarazel.de>
Cc: Peter Eisentraut <peter.eisentraut@enterprisedb.com>,
	Peter Geoghegan <pg@bowt.ie>, wangw.fnst@fujitsu.com,
	Tom Lane <tgl@sss.pgh.pa.us>,
	Nathan Bossart <nathandbossart@gmail.com>,
	Andrew Dunstan <andrew@dunslane.net>,
	Thomas Munro <thomas.munro@gmail.com>,
	samay sharma <smilingsamay@gmail.com>,
	Nazir Bilal Yavuz <byavuz81@gmail.com>,
	pgsql-hackers@postgresql.org
Subject: Re: [RFC] building postgres with meson - v13
Message-ID: <20221018170930.GA16921@telsasoft.com>
References: <20220922150550.pscsjv4nwnslupeg@awork3.anarazel.de>
 <20220922200533.GA697326@nathanxps13>
 <20220922202809.4touie37lfafyabw@awork3.anarazel.de>
 <20220922223729.GA721620@nathanxps13>
 <2298281.1664041949@sss.pgh.pa.us>
 <20220924180955.2hevwoniwsj2q2tm@awork3.anarazel.de>
 <c5736f70-bb6d-8d25-e35c-e3d886e4e905@enterprisedb.com>
 <20220926163516.ftxjmoljjwyy4m2q@awork3.anarazel.de>
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> From 680ff3f7b4da1dbf21d0c7cd87af9bb5ee8b230c Mon Sep 17 00:00:00 2001
> From: Andres Freund <andres@anarazel.de>
> Date: Wed, 21 Sep 2022 20:36:36 -0700
> Subject: [PATCH v17 01/23] meson: ci: wip: move compilerwarnings task to meson
> 
> ---
>  .cirrus.yml                            | 92 +++++++++++++-------------
>  src/tools/ci/linux-mingw-w64-64bit.txt | 13 ++++
>  2 files changed, 59 insertions(+), 46 deletions(-)
>  create mode 100644 src/tools/ci/linux-mingw-w64-64bit.txt
> 
> diff --git a/.cirrus.yml b/.cirrus.yml
> index 7b5cb021027..eb33fdc4855 100644
> --- a/.cirrus.yml
> +++ b/.cirrus.yml
> @@ -465,6 +465,10 @@ task:
>    ccache_cache:
>      folder: $CCACHE_DIR
>  
> +  ccache_stats_start_script:
> +    ccache -s
> +    ccache -z

I realized that ccache -z clears out not only the global stats, but the
per-file cache stats (from which the global stats are derived) - which
obviously makes the cache work poorly.

Newer ccache has CCACHE_STATSLOG, and --show-log-stats, which I think
can do what's wanted.  I'll update my ci branch with that.