|From:||Heikki Linnakangas <hlinnaka(at)iki(dot)fi>|
|Cc:||Peter Geoghegan <pg(at)bowt(dot)ie>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>|
|Subject:||Re: Polyphase merge is obsolete|
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On 22/10/2020 14:48, Heikki Linnakangas wrote:
> On 11/09/2017 13:37, Tomas Vondra wrote:
>> I planned to do some benchmarking on this patch, but apparently the
>> patch no longer applies. Rebase please?
> Here's a rebase of this. Sorry to keep you waiting :-).
Here's an updated version that fixes one bug:
The CFBot was reporting a failure on the FreeBSD system . It turned
out to be an out-of-memory issue caused by an underflow bug in the
calculation of the size of the tape read buffer size. With a small
work_mem size, the memory left for tape buffers was negative, and that
wrapped around to a very large number. I believe that was not caught by
the other systems, because the other ones had enough memory for the
incorrectly-sized buffers anyway. That was the case on my laptop at
least. It did cause a big slowdown in the 'tuplesort' regression test
though, which I hadn't noticed.
The fix for that bug is here as a separate patch for easier review, but
I'll squash it before committing.
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