From: Aleksander Alekseev <a.alekseev@postgrespro.ru>
To: Teodor Sigaev <teodor@sigaev.ru>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Subject: Re: Patch: fix lock contention for HASHHDR.mutex
Date: Fri, 18 Dec 2015 17:19:33 +0300
Message-ID: <20151218171933.500845f6@fujitsu> (raw)
In-Reply-To: <56740E41.4010708@sigaev.ru>
References: <20151211170001.78ded9d7@fujitsu>
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<CA+TgmoavsNuBNQf6ROn020F6g9gXJjtMrSkSFZ=RL1t2eJHQ5Q@mail.gmail.com>
<20151217151418.GB2224@awork2.anarazel.de>
<20151217190342.07e4533a@fujitsu>
<CA+Tgmob1-7=Bh21LyLXk7Yst1nzcA1P=rv0UKq1zH+A9PVehrg@mail.gmail.com>
<56740E41.4010708@sigaev.ru>
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> Could we split one freelist in hash to NUM_LOCK_PARTITIONS freelists?
> Each partition will have its own freelist and if freelist is empty
> then partition should search an entry in freelists of other
> partitions. To prevent concurrent access it's needed to add one
> LWLock to hash, each partition should lock LWlock in share mode to
> work with its own freelist and exclusive to work with other freelists.
>
> Actually, I'd like to improve all partitioned hashes instead of
> improve only one case.
It seems to be a most promising direction of research for now. I will
send a patch and benchmark results soon.
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To: pgsql-hackers@postgresql.org
Cc: a.alekseev@postgrespro.ru, teodor@sigaev.ru, robertmhaas@gmail.com, andres@anarazel.de, amit.kapila16@gmail.com
Subject: Re: Patch: fix lock contention for HASHHDR.mutex
In-Reply-To: <20151218171933.500845f6@fujitsu>
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