From: Andi Kleen <andi@firstfloor.org>
To: Nicolas Pitre <nico@cam.org>
Cc: Ken Pratt <ken@kenpratt.net>, Andi Kleen <andi@firstfloor.org>,
"Shawn O. Pearce" <spearce@spearce.org>,
git@vger.kernel.org
Subject: Re: pack operation is thrashing my server
Date: Wed, 13 Aug 2008 04:50:27 +0200 [thread overview]
Message-ID: <20080813025027.GG1366@one.firstfloor.org> (raw)
In-Reply-To: <alpine.LFD.1.10.0808122220500.9984@xanadu.home>
> If you have only 256 MB of RAM, I'm afraid the machine dives into swap
> the moment it attempts to process that single 150-MB object during
> repacking. Objects are always allocated entirely, including the
> deflated and inflated copy at some point. Making git handle partial
> objects in memory would add complexity all over the map so I don't think
> it'll ever be implemented nor be desirable.
If the access pattern is sequential and not much reuse it might be possible
to madvise() strategically to do prefetch and early unmap of not used
anymore data. I used that successfully in a few programs in the past that did
aggressive mmap on very large files.
-Andi
next prev parent reply other threads:[~2008-08-13 2:50 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-10 19:47 pack operation is thrashing my server Ken Pratt
2008-08-10 23:06 ` Martin Langhoff
2008-08-10 23:12 ` Ken Pratt
2008-08-10 23:30 ` Martin Langhoff
2008-08-10 23:34 ` Ken Pratt
2008-08-11 3:04 ` Shawn O. Pearce
2008-08-11 7:43 ` Ken Pratt
2008-08-11 15:01 ` Shawn O. Pearce
2008-08-11 15:40 ` Avery Pennarun
2008-08-11 15:59 ` Shawn O. Pearce
2008-08-11 19:13 ` Ken Pratt
2008-08-11 19:10 ` Andi Kleen
2008-08-11 19:15 ` Ken Pratt
2008-08-13 2:38 ` Nicolas Pitre
2008-08-13 2:50 ` Andi Kleen [this message]
2008-08-13 2:57 ` Shawn O. Pearce
2008-08-11 19:22 ` Shawn O. Pearce
2008-08-11 19:29 ` Ken Pratt
2008-08-11 19:34 ` Shawn O. Pearce
2008-08-11 20:10 ` Andi Kleen
2008-08-13 3:12 ` Geert Bosch
2008-08-13 3:15 ` Shawn O. Pearce
2008-08-13 3:58 ` Geert Bosch
2008-08-13 14:37 ` Nicolas Pitre
2008-08-13 14:56 ` Jakub Narebski
2008-08-13 15:04 ` Shawn O. Pearce
2008-08-13 15:26 ` David Tweed
2008-08-13 23:54 ` Martin Langhoff
2008-08-14 9:04 ` David Tweed
2008-08-13 16:10 ` Johan Herland
2008-08-13 17:38 ` Ken Pratt
2008-08-13 17:57 ` Nicolas Pitre
2008-08-13 14:35 ` Nicolas Pitre
2008-08-13 14:59 ` Shawn O. Pearce
2008-08-13 15:43 ` Nicolas Pitre
2008-08-13 15:50 ` Shawn O. Pearce
2008-08-13 17:04 ` Nicolas Pitre
2008-08-13 17:19 ` Shawn O. Pearce
2008-08-14 6:33 ` Andreas Ericsson
2008-08-14 10:04 ` Thomas Rast
2008-08-14 10:15 ` Andreas Ericsson
2008-08-14 22:33 ` Shawn O. Pearce
2008-08-15 1:46 ` Nicolas Pitre
2008-08-14 14:01 ` Nicolas Pitre
2008-08-14 17:21 ` Linus Torvalds
2008-08-14 17:58 ` Linus Torvalds
2008-08-14 19:04 ` Nicolas Pitre
2008-08-14 19:44 ` Linus Torvalds
2008-08-14 21:30 ` Andi Kleen
2008-08-15 16:15 ` Linus Torvalds
2008-08-14 21:50 ` Nicolas Pitre
2008-08-14 23:14 ` Linus Torvalds
2008-08-14 23:39 ` Björn Steinbrink
2008-08-15 0:06 ` Linus Torvalds
2008-08-15 0:25 ` Linus Torvalds
2008-08-16 12:47 ` Björn Steinbrink
2008-08-16 0:34 ` Linus Torvalds
2008-09-07 1:03 ` Junio C Hamano
2008-09-07 1:46 ` Linus Torvalds
2008-09-07 2:33 ` Junio C Hamano
2008-09-07 17:11 ` Nicolas Pitre
2008-09-07 17:41 ` Junio C Hamano
2008-09-07 2:50 ` Jon Smirl
2008-09-07 3:07 ` Linus Torvalds
2008-09-07 3:43 ` Jon Smirl
2008-09-07 4:50 ` Linus Torvalds
2008-09-07 13:58 ` Jon Smirl
2008-09-07 17:08 ` Nicolas Pitre
2008-09-07 20:33 ` Jon Smirl
2008-09-08 14:17 ` Nicolas Pitre
2008-09-08 15:12 ` Jon Smirl
2008-09-08 16:01 ` Jon Smirl
2008-09-07 8:18 ` Andreas Ericsson
2008-09-07 7:45 ` Mike Hommey
2008-08-14 18:38 ` Nicolas Pitre
2008-08-14 18:55 ` Linus Torvalds
2008-08-13 16:01 ` Geert Bosch
2008-08-13 17:13 ` Dana How
2008-08-13 17:26 ` Nicolas Pitre
2008-08-13 12:43 ` Jakub Narebski
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