Subject: Re: Issues with the wrappers
To: Krister Walfridsson <email@example.com>
From: Ignatios Souvatzis <firstname.lastname@example.org>
Date: 07/31/2006 07:56:37
On Sun, Jul 30, 2006 at 02:47:16PM +0200, Krister Walfridsson wrote:
> I have noticed some issues with the wrappers while doing work on a package
> that compiles quite a lot of files (lang/ghc).
> 1. Too much is cached in the wrapper cache
> Ghc use absolute paths to the files during compilation, with the
> result that all those input/output-filenames are added to the cache,
> and the cache has 65879 lines at end of compilation. This is bad
> because /bin/sh does not handle big case statements efficiently [a],
> and each lookup consumes 0.2 seconds on my AMD Athlon 3500+ machine.
> This adds up, and hours are spent in this case-statement during the
> build of the package.
> I would assume that most filenames provided to the compiler are only
> used once, and do not need to be cached. My suggestion is that
> we should not add the -o options or filenames that are used as input
> (or expressed differently, we should only add arguments that start
> with an '-' and their arguments, unless they are the '-o' option). [b]
> 2. Too much is logged in the .wrapper.log
> The wrappers log quite a lot of detailed information by default,
> with the result that my .work.log file is 176236028 bytes.
> The wrapper functionality is mature, so this detailed information
> is seldom needed, and you can in general determine what happened
> by looking at the input/output-lines (i.e. those lines marked as "[*]"
> and "<.>" in the .work.log). I would therefore like to change the
> default behavior to only log the input/output-lines.
Whatever speeds up building of ghc is good.
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