On Wed, Jul 13, 2011 at 3:41 PM, lars <lhofhansl@yahoo.com> wrote:
> On 07/13/2011 11:42 AM, Kevin Grittner wrote:
>>
>> So transactions without an XID *are* sensitive to
>> synchronous_commit. That's likely a useful clue.
>>
>> How much did it help the run time of the SELECT which followed the
>> UPDATE?
>
> It has surprisingly little impact on the SELECT side:
If your fsync is truly fsyncing, it seems like it should have
considerable effect.
Could you strace with both -ttt and -T, with and without synchronous commit?
Cheers,
Jeff