Gentoo Archives: gentoo-performance

From: lnxg33k <lnxg33k@×××××.com>
To: gentoo-performance@l.g.o
Subject: Re: [gentoo-performance] More portage questions
Date: Wed, 25 Jan 2006 02:38:40
In Reply to: Re: [gentoo-performance] More portage questions by Alec Warner
Alec Warner wrote:
> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > lnxg33k wrote: >> I added the metadata/some-cat to the rsync_exclude list by prefacing >> every entry with an '*'. Vastly increased the 2nd phase of sync'ing and >> cleared up some storage. I gather that the the cached files end up in > *laughs* > >> "/var/cache/edb/dep/usr/portage/". Would purging the rsync_exclude >> entries here cause any problems? I'm guessing that `emerge -S` searches >> would be faster as there are less entries to check. There's also the >> storage issue as well. Thanks > > Maybe the benifit is good for you. Those metadata directories in the > tree are important because generating portage metadata is costly in > terms of time. Thats WHY we do it. > > When you exclude those directories ( or all of metadata/ ) you are > merely moving the cache time from emerge --sync to emerge <blar>. > Portage will notice the stale cache and regenerate the metadata on the > fly. As noted earlier, this generation is SLOW. Maybe you notice, > maybe you do not. It really depends on whether the queries you run > against portage hit the areas that lack on-disk metadata. > > For extra fun, try rm -rf /var/cache/edb/dep/usr, then an emerge --regen > and tell me it's fast ;) > > As for the emerge -S bit, it won't be any faster. It still iterates > over the whole tree, and once again, portage will generate the metadata > locally = slower. Use another tool, ( eix,esearch ) they are better for > this IMHO. Sorry it doesn't come all built into one tool, we are > working on it. > > Alec Warner (antarus)
<snip> Heh heh. I should hit the books or something. ;) Actually, I rarely search and haven't emerged anything so I haven't had the chance to see the effects of my "insight". I keep thinking "less files = faster 'x' because nothing to do". I had eix installed until today when I realized I never searched. Anyway, thanks once again for the err in thinking. -- gentoo-performance@g.o mailing list