On Thu, Jan 8, 2015 at 11:59 PM, Rahila Syed <rahilasyed...@gmail.com> wrote: > Below are performance numbers in case of synchronous replication with and > without fpw compression using latest version of patch(version 14). The patch > helps improve performance considerably. > Both master and standby are on the same machine in order to get numbers > independent of network overhead. So this test can be used to evaluate how shorter records influence performance since the master waits for flush confirmation from the standby, right?
> The compression patch helps to increase tps by 10% . It also helps reduce > I/O to disk , latency and total runtime for a fixed number of transactions > as shown below. > The compression of WAL is quite high around 40%. > > Compression on > off > > WAL generated 23037180520(~23.04MB) > 38196743704(~38.20MB) Isn't that GB and not MB? > TPS 264.18 239.34 > > Latency average 60.541 ms 66.822 > ms > > Latency stddev 126.567 ms 130.434 > ms > > Total writes to disk 145045.310 MB 192357.250MB > Runtime 15141.0 s 16712.0 s How many FPWs have been generated and how many dirty buffers have been flushed for the 3 checkpoints of each test? Any data about the CPU activity? -- Michael -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
