Almost everything I see/hear about huge pages in Linux lend credence to why it's probably never to be used. Is there any particular scenario where it actually helps? Genuine question.pic.twitter.com/qRVpiqc81O
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Postgres developer, working at Microsoft. Also: politics nerd, expat German in the US. Account for tech related things. For politics: @AndresFreundPol
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Almost everything I see/hear about huge pages in Linux lend credence to why it's probably never to be used. Is there any particular scenario where it actually helps? Genuine question.pic.twitter.com/qRVpiqc81O
Huge/super pages seem to help a lot with PostgreSQL on FreeBSD (code, main shm area, parallel query shm segments). I suspect that on Linux the problem is the "transparent" part doesn't work well yet, and it doesn't work at all for some classes of memory we care about.
AFAIK it's actually recommended to use regular Huge Pages for Postgres on Linux - its just the transparent part that causes issues. @AndresFreundTec has done benchmarking on this, I believe.
Indeed. And it's not just performance in workloads that touch a lot of pages in short order - they can very significantly reduce memory overhead for each connection too.
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