On Fri, Aug 30, 2013 at 11:55 AM, Fujii Masao <masao.fu...@gmail.com> wrote: > My idea is very simple, just compress FPW because FPW is > a big part of WAL. I used pglz_compress() as a compression method, > but you might think that other method is better. We can add > something like FPW-compression-hook for that later. The patch > adds new GUC parameter, but I'm thinking to merge it to full_page_writes > parameter to avoid increasing the number of GUC. That is, > I'm thinking to change full_page_writes so that it can accept new value > 'compress'. Instead of a generic 'compress', what about using the name of the compression method as parameter value? Just to keep the door open to new types of compression methods.
> * Result > [tps] > 1386.8 (compress_backup_block = off) > 1627.7 (compress_backup_block = on) > > [the amount of WAL generated during running pgbench] > 4302 MB (compress_backup_block = off) > 1521 MB (compress_backup_block = on) > > At least in my test, the patch could reduce the WAL size to one-third! Nice numbers! Testing this patch with other benchmarks than pgbench would be interesting as well. -- Michael -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
