On 05/04/2011 10:10 AM, Mitsuru IWASAKI wrote:
> Hi,
>
> I am working on new feature `Buffer Cache Hibernation' which enables
> postgres to keep higher cache hit ratio even just started.
>
> Postgres usually starts with ZERO buffer cache. By saving the buffer
> cache data structure into hibernation files just before shutdown, and
> loading them at startup, postgres can start operations with the saved
> buffer cache as the same condition as just before the last shutdown.
>
> Here is the patch for 9.0.3 (also tested on 8.4.7)
> http://people.freebsd.org/~iwasaki/postgres/buffer-cache-hibernation-postgresql-9.0.3.patch
>
> The patch includes the following.
> - At shutdown, buffer cache data structure (such as BufferDescriptors,
> BufferBlocks and StrategyControl) is saved into hibernation files.
> - At startup, buffer cache data structure is loaded from hibernation
> files and buffer lookup hashtable is setup based on buffer descriptors.
> - Above functions are enabled by specifying `enable_buffer_cache_hibernation=on'
> in postgresql.conf.
>
> Any comments are welcome and I would very much appreciate merging the
> patch in source tree.
>
>
That sounds cool.
Please a) make sure your patch is up to data against the latest source
in git and b) submit it to the next commitfest at
<https://commitfest.postgresql.org/action/commitfest_view?id=10>
We don't backport features, and 9.1 is closed for features now, so the
earliest release this could be used in is 9.2.
cheers
andrew
