| From: | "Mikheev, Vadim" <vmikheev(at)SECTORBASE(dot)COM> |
|---|---|
| To: | "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Alfred Perlstein <bright(at)wintelcom(dot)net>, Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>, peter_e(at)gmx(dot)net, pgsql-hackers(at)postgresql(dot)org |
| Subject: | RE: RE: [COMMITTERS] pgsql/src/backend/access/transam ( xact.c xlog.c) |
| Date: | 2000-11-15 18:50:56 |
| Message-ID: | 8F4C99C66D04D4118F580090272A7A234D317E@sectorbase1.sectorbase.com |
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| Lists: | pgsql-hackers |
> Earlier, Vadim was talking about arranging to share fsyncs of the WAL
> log file across transactions (after writing your commit record to the
> log, sleep a few milliseconds to see if anyone else fsyncs before you
> do; if not, issue the fsync yourself). That would offer less-than-
> one-fsync-per-transaction performance without giving up any
> guarantees.
> If people feel a compulsion to have a tunable parameter, let 'em tune
> the length of the pre-fsync sleep ...
Already implemented (without ability to tune this parameter -
xact.c:CommitDelay, - yet). Currently CommitDelay is 5, so
backend sleeps 1/200 sec before checking/forcing log fsync.
Vadim
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