| From: | Aleksander Alekseev <a(dot)alekseev(at)postgrespro(dot)ru> |
|---|---|
| To: | Teodor Sigaev <teodor(at)sigaev(dot)ru> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Subject: | Re: Patch: fix lock contention for HASHHDR.mutex |
| Date: | 2015-12-18 14:19:33 |
| Message-ID: | 20151218171933.500845f6@fujitsu |
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| Thread: | |
| Lists: | pgsql-hackers |
> 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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