On Thu, Jun 14, 2018 at 6:14 PM, Robert Haas <robertmh...@gmail.com> wrote: > On Wed, Jun 13, 2018 at 11:45 PM, Amit Kapila <amit.kapil...@gmail.com> wrote: >>> I have tested wal_prefetch at two powerful servers with 24 cores, 3Tb NVME >>> RAID 10 storage device and 256Gb of RAM connected using InfiniBand. >>> The speed of synchronous replication between two nodes is increased from 56k >>> TPS to 60k TPS (on pgbench with scale 1000). >> >> That's a reasonable improvement. > > Somehow I would have expected more. That's only a 7% speedup. >
It might be due to the reason that there is already a big overhead of synchronous mode of replication that it didn't show a big speedup. We might want to try recovery (PITR) or maybe async replication to see if we see any better numbers. -- With Regards, Amit Kapila. EnterpriseDB: http://www.enterprisedb.com
