Make bgwriter sleep longer when it has no work to do, to save electricity. To make it wake up promptly when activity starts again, backends nudge it by setting a latch in MarkBufferDirty(). The latch is kept set while bgwriter is active, so there is very little overhead from that when the system is busy. It is only armed before going into longer sleep.
Peter Geoghegan, with some changes by me. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/6d90eaaa89a007e0d365f49d6436f35d2392cfeb Modified Files -------------- src/backend/postmaster/bgwriter.c | 144 +++++++++++++++++++++++++++++++---- src/backend/storage/buffer/bufmgr.c | 41 ++++++++--- src/include/storage/bufmgr.h | 2 +- src/include/storage/proc.h | 2 + 4 files changed, 163 insertions(+), 26 deletions(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
