On 04/08/10 03:53, Craig Ringer wrote:
> BTW, When I suggested that greater write concurrency would be desirable
> and should be easier, Phil Stracchino raised some concerns about
> concurrent writes to a file system increasing fragmentation and hurting
> overall performance. Rather than just wave my hands about that I've put
> together a testing tool for concurrently writing big files from multiple
> threads that optionally uses posix_fallocate to pre-allocate ahead in
> chunks up to total file size. It tracks per-thread and total runtime and
> time spent in write() and posix_fallocate() calls. I'm doing some tests
> with it now and will post it to the bacula-devel list too. I'm planning
> on testing the real effects of various levels of concurrent writes on
> common file systems with it using a controlling shell script and will
> report back when that eventually finishes.
I'll be interested to see those results. Which filesystems are you testing?
--
Phil Stracchino, CDK#2 DoD#299792458 ICBM: 43.5607, -71.355
ala...@caerllewys.net ala...@metrocast.net p...@co.ordinate.org
Renaissance Man, Unix ronin, Perl hacker, Free Stater
It's not the years, it's the mileage.
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