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From: Linus Torvalds <torvalds@osdl.org>
To: Carl Baldwin <cnb@fc.hp.com>
Cc: git@vger.kernel.org
Subject: Re: Revisiting large binary files issue.
Date: Mon, 10 Jul 2006 16:28:24 -0700 (PDT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0607101623230.5623@g5.osdl.org> (raw)
In-Reply-To: <20060710230132.GA11132@hpsvcnb.fc.hp.com>



On Mon, 10 Jul 2006, Carl Baldwin wrote:
> 
> When I set the window to 0 I one more issue.  Even though the blobs are
> already compressed on disk I still seem to pay the penalty of inflating
> them into memory and then deflating them into the pack.  When the window
> size is 0 this is just wasted cycles.  With large binary files these
> wasted cycles slow down the push/fetch operation considerably.  Couldn't
> the compressed blobs be copied into the pack without first deflating
> them in this 0 window case?

The problem is that the individual object disk format isn't actually the 
same as the pack-file object format for one object. The header is 
different: a pack-file uses a very dense bit packing, while the individual 
object format is a bit less dense.

Sad, really, but it means that right now you can only re-use data that was 
already packed (when the format matches).

		Linus

  parent reply	other threads:[~2006-07-10 23:34 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-10 23:01 Revisiting large binary files issue Carl Baldwin
2006-07-10 23:14 ` Junio C Hamano
2006-07-11  6:20   ` Peter Baumann
2006-07-10 23:28 ` Linus Torvalds [this message]
2006-07-11  9:40   ` [RFC]: Pack-file object format for individual objects (Was: Revisiting large binary files issue.) sf
2006-07-11 18:00     ` Linus Torvalds
2006-07-11 21:45       ` sf
2006-07-11 22:17         ` Linus Torvalds
2006-07-11 22:26           ` Linus Torvalds
2006-07-11 14:55   ` Revisiting large binary files issue Carl Baldwin
2006-07-11 17:09     ` Linus Torvalds
2006-07-11 17:10       ` [PATCH 1/3] Make the unpacked object header functions static to sha1_file.c Linus Torvalds
2006-07-11 17:12       ` [PATCH 2/3] sha1_file: add the ability to parse objects in "pack file format" Linus Torvalds
2006-07-11 18:40         ` Johannes Schindelin
2006-07-11 18:58           ` Linus Torvalds
2006-07-11 19:20             ` Johannes Schindelin
2006-07-11 19:48               ` Linus Torvalds
2006-07-11 21:25                 ` Johannes Schindelin
2006-07-11 21:47                 ` Junio C Hamano
2006-07-11 21:24         ` sf
2006-07-11 22:09           ` Linus Torvalds
2006-07-11 22:25             ` sf
2006-07-11 23:03             ` Junio C Hamano
2006-07-12  0:03               ` Linus Torvalds
2006-07-12  0:39                 ` Johannes Schindelin
2006-07-12  3:45                   ` Linus Torvalds
2006-07-12  4:31                     ` Linus Torvalds
2006-07-12  6:35                     ` Junio C Hamano
2006-07-12 16:29                       ` Linus Torvalds
2006-07-12  0:46                 ` Junio C Hamano
2006-07-12  3:42                   ` Linus Torvalds
2006-07-12  6:49                 ` Peter Baumann
2006-07-12  7:16                   ` Junio C Hamano
2006-07-12  8:28                     ` Peter Baumann
2006-07-12 15:13                   ` Linus Torvalds
2006-07-12 15:27                     ` Junio C Hamano
2006-07-11 17:16       ` [PATCH 3/3] Enable the new binary header format for unpacked objects Linus Torvalds

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