Re: git-svn metadata commands performance issue

From: David Kastrup <dak@gnu.org>
Date: Jan 15, 2015, 11:53 UTC
Message-ID: <87sifcdzul.fsf@fencepost.gnu.org>
In-Reply-To: <20150114203012.GA26023@dcvr.yhbt.net>

Eric Wong <normalperson@yhbt.net> writes:

> How big is the parent process which forks the git commands?  On Linux at
> least, fork() performance is negatively impacted by parent process
> memory size.

Huh. I thought with the advent of demand-paging, at the very least with copy-on-write, this was supposed to be sort of a non-issue.

The old original UNIX version, in contrast, consisted of swapping out the current process without removing the in-memory copy. But since the in-memory copy then did the exec call and since usually the exec call was happy about every page of free memory (we _are_ talking about something like 64kB of total available memory here), that tended to work reasonably well.

-- 
David Kastrup