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Re: [Monotone-devel] [PATCH] pre-cache database file to improve response
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From: |
Ulrich Drepper |
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Subject: |
Re: [Monotone-devel] [PATCH] pre-cache database file to improve response time |
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Date: |
Sat, 18 Mar 2006 18:16:44 -0800 |
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User-agent: |
Thunderbird 1.5 (X11/20060313) |
Joe Wilson wrote:
> Here's a patch to improve the speed of many database-intensive monotone
> commands.
>
> It can shave 70% of the time off of a (cold) checkout, for example.
It might, but it does so violently. It's forcing other data out of the
caches.
Modern OSes have support for hints to the OS. For mmap() calls on
Linux, there is the MAP_POPULATE flag. For all file operations, there
is posix_fadvise().
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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