Tom Lane wrote:

Hmmm ... AFAICS this must mean that flushing the WAL data to disk
at transaction commit time takes (most of) 20 msec on your hardware.
Which still seems high --- on most modern disks that'd be at least two
disk revolutions, maybe more.  What's the disk hardware you're testing
on, particularly its RPM spec?
I actually ran the test on my laptop. It has an Ultra ATA/100 drive (5400 rpm). The test was just a quickie to show some data from the probes. I'll collect and share data from the T2000 server later.


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