| From: | Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
|---|---|
| To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Andres Freund <andres(at)anarazel(dot)de> |
| Subject: | Re: Different compression methods for FPI |
| Date: | 2021-06-14 09:47:08 |
| Message-ID: | 390DF859-3362-4299-88FC-130161950C0D@yandex-team.ru |
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| Lists: | pgsql-hackers |
Thanks for benchmarks, Justin!
> 14 июня 2021 г., в 06:24, Justin Pryzby <pryzby(at)telsasoft(dot)com> написал(а):
>
> The GUC is PGC_USERSET
Oh, wow, that's neat. I did not realize that we can tune this for each individual client connection. Cool!
> pglz writes ~half as much, but takes twice as long as uncompressed:
> |Time: 3362.912 ms (00:03.363)
> |wal_bytes | 11644224
>
> zlib writes ~4x less than ncompressed, and still much faster than pglz
> |Time: 2167.474 ms (00:02.167)
> |wal_bytes | 5611653
>
> lz4 is as fast as uncompressed, and writes a bit more than pglz:
> |Time: 1612.874 ms (00:01.613)
> |wal_bytes | 12397123
>
> zstd(6) is slower than lz4, but compresses better than anything but zlib.
> |Time: 1808.881 ms (00:01.809)
> |wal_bytes | 6395993
I was wrong about zlib: it has its point on Pareto frontier. At least for this test.
Thanks!
Best regards, Andrey Borodin.
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