Re: [RFC PATCH 0/4] name-rev: improve memory usage
- Date: Fri, 1 Mar 2019 20:14:26 +0100
- From: Alban Gruin <alban.gruin@xxxxxxxxx>
- Subject: Re: [RFC PATCH 0/4] name-rev: improve memory usage
Le 01/03/2019 à 19:42, Jeff King a écrit :
> On Fri, Mar 01, 2019 at 06:50:20PM +0100, Alban Gruin wrote:
>> rafasc reported on IRC that on a repository with a lot of branches,
>> tags, remotes, and commits, name-rev --stdin could use a massive amount
>> of memory (more than 2GB of RAM) to complete.
>> This patch series tries to improve name-rev’s memory usage.
> Have you tried this?
> diff --git a/builtin/name-rev.c b/builtin/name-rev.c
> index f1cb45c227..7aaa86f1c0 100644
> --- a/builtin/name-rev.c
> +++ b/builtin/name-rev.c
> @@ -431,6 +431,8 @@ int cmd_name_rev(int argc, const char **argv, const char *prefix)
> + save_commit_buffer = 0;
> git_config(git_default_config, NULL);
> argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
> It seems to lower heap usage of:
> git name-rev 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
> in linux.git (that commit is the final one reported by "git log", so
> it's traversing all of history) from ~1GB to ~300MB.
Unfortunately this does not work in all cases, apparently. On my git
copy, I have 3 origins. If I run this:
git log --graph --oneline --abbrev=-1 -5 | git name-rev --stdin
With or without your change, it uses 3GB of RAM. With this series, it
uses 25MB of RAM.
With the first git commit:
git name-rev e83c5163316f89bfbde7d9ab23ca2e25604af290
It also uses 3GB of RAM. With this series, it uses around 350MB of RAM.
Which makes me think that I should adapt 4/4 to arguments.
Sorry, I should have specified this in the cover letter.