> 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