From: Bradley W. Settlemyer <settlemyerbw@ornl.gov>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] max_dirty_mb and fsync
Date: Fri, 16 Oct 2009 11:37:16 -0400 [thread overview]
Message-ID: <4AD8932C.9070602@ornl.gov> (raw)
In-Reply-To: <4AD76F52.4040706@ornl.gov>
Obviously, when I write 32MB in the second paragraph I mean 4MB. Sorry
for the error.
Cheers
Brad
On 10/15/2009 02:52 PM, Bradley W. Settlemyer wrote:
> Hello
>
> What is the difference between setting the max_dirty_mb setting in
> /proc to 4 and making sure that all of my applications fsync every 4MBs
> of data that are transmitted?
>
> I would guess that one difference is the 32MB is a filesystem-wide
> setting rather than a per file setting -- so the sync occurs regardless
> of the number of files receiving data. But are there any other
> differences with regards to the interaction with the file system.
>
> More to the point perhaps, does an fsync have additional side effects
> beyond those that occur for the max_dirty_mb threshhold being exceeded?
>
> Cheers,
> Brad
>
> _______________________________________________
> Lustre-devel mailing list
> Lustre-devel at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-devel
>
next prev parent reply other threads:[~2009-10-16 15:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-15 18:52 [Lustre-devel] max_dirty_mb and fsync Bradley W. Settlemyer
2009-10-16 15:37 ` Bradley W. Settlemyer [this message]
2009-10-17 17:53 ` Andreas Dilger
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