Re: file system performance in linux

["Mulyadi Santosa" <mulyadi.santosa@xxxxxxxxx>]

Hi..

On Mon, Oct 27, 2008 at 8:22 PM, pradeepkumar soman
<pradeep2481@xxxxxxxxx> wrote:
> Hi,
>    I am using the iozone tool for measuring the file system performance. but
> when I use the auto mode in iozone the read performance is very low in some
> cases(getting 32MB/s for record  length > 128kb, for iGB file size) compared
> to throughput mode(70MB/sec irrespective of the record or file size). What
> is the reason for this difference.

That could happen for many reasons:
1. single reader/writer versus multiple readers/writers

2. effectiveness of readahead algorithm implemented in your running kernel

3. hard disk's cache size

4. the way read/write is done

5. sync versus async

and so on.

regards,

Mulyadi.

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