Re: Free WAL caches on switching segments

Mark Kirkwood <markir@paradise.net.nz> writes:
> Thinking about this, presumably any write intensive, multi-user
> benchmark would seem to be suitable, so would something like OSDL's
> DBT-2 actually be better to try?

I'm certainly not wedded to pgbench, give it a try.

BTW, I forgot to mention that it would be useful to try different
wal_sync_methods along with this.  The reason why it seems unlikely
the patch is useful on Linux is that the sync methods that use O_DIRECT
probably dominate using the patch anyway.  There may or may not be
a similar dependence on sync method on other kernels ...

            regards, tom lane