On 7/14/05, Jeffrey W. Baker <[EMAIL PROTECTED]> wrote:
> [reposted due to delivery error -jwb]
> I just took delivery of a new system, and used the opportunity to
> benchmark postgresql 8.0 performance on various filesystems.  The system
> in question runs Linux 2.6.12, has one CPU and 1GB of system memory, and
> 5 7200RPM SATA disks attached to an Areca hardware RAID controller
> having 128MB of cache.  The caches are all write-back.
> I ran pgbench with a scale factor of 1000 and a total of 100,000
> transactions per run.  I varied the number of clients between 10 and
> 100.  It appears from my test JFS is much faster than both ext3 and XFS
> for this workload.  JFS and XFS were made with the mkfs defaults.  ext3
> was made with -T largefile4 and -E stride=32.  The deadline scheduler
> was used for all runs (anticipatory scheduler is much worse).
> Here's the result, in transactions per second.
>               ext3  jfs  xfs
> -----------------------------
>  10 Clients     55   81   68
> 100 Clients     61  100   64
> ----------------------------

If you still have a chance, could you do tests with other journaling
options for ext3 (journal=writeback, journal=data)?  And could you
give figures about performace of other IO elevators?  I mean, you
wrote that anticipatory is much wore -- how much worse? :)  Could
you give numbers for deadline,anticipatory,cfq elevators? :)

And, additionally would it be possible to give numbers for bonnie++
results?  To see how does pgbench to bonnie++ relate?


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