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List:       kde-optimize
Subject:    Re: Dynamic symbol table
From:       Oswald Buddenhagen <ossi () kde ! org>
Date:       2004-07-16 15:57:33
Message-ID: 20040716155733.GA25073 () ugly ! local
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On Fri, Jul 16, 2004 at 03:45:30PM +0200, Lubos Lunak wrote:
> And I did a test as well and it took somewhat shorter than demand
> paging the libs. Makes sense given that seeking is much slower than
> the actual reading. 
> 
please do another test: instead of calling madvise, immediately read one
byte from each mapped page. i.e., don't let the kernel load the pages if
it thinks disks are idle, but enforce synchronous loading. i know for
sure that forced read-ahead improves memcpy behaviour more than cache
prefetch instructions. i wouldn't be surprised if a similar effect could
be observed with disk io - after all, with your current implementation
the program is running concurrently to madvise's effect and thus causes
trashing (theoretically).

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