Re: Load Distributed Checkpoints test results

On 6/15/07, Gregory Stark <stark@enterprisedb.com> wrote:
> While in theory spreading out the writes could have a detrimental effect I
> think we should wait until we see actual numbers. I have a pretty strong
> suspicion that the effect would be pretty minimal. We're still doing the same
> amount of i/o total, just with a slightly less chance for the elevator
> algorithm to optimize the pattern.

..and the sort patching suggests that the OS's elevator isn't doing a
great job for large flushes in any case. I wouldn't be shocked to see
load distributed checkpoints cause an unconditional improvement since
they may do better at avoiding the huge burst behavior that is
overrunning the OS elevator in any case.