Re: [HACKERS] FWD: fastlock+lazyvzid patch performance
On Fri, Jun 24, 2011 at 3:31 PM, karave...@mail.bg wrote: I post this results because they somehow contradict with previous results posted on the list. In my case the patches does not only improve peak performance but also improve the performance under load - without patches the performance with 256 clients is 53% of the peak performance that is obtained with 8 clients, with patches the performance with 256 client is 79% of the peak with 8 clients. I think this is strongly related to core count. The spinlock contention problems don't become really bad until you get up above 32 CPUs... at least from what I can tell so far. So I'm not surprised it was just a straight win on your machine... but thanks for verifying. It's helpful to have more data points. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] FWD: fastlock+lazyvzid patch performance
On Fri, Jun 24, 2011 at 3:31 PM, karave...@mail.bg wrote: clients beta2 +fastlock +lazyvzid local socket 8 76064 92430 92198 106734 16 64254 90788 90698 105097 32 56629 88189 88269 101202 64 51124 84354 84639 96362 128 45455 79361 79724 90625 256 40370 71904 72737 82434 I'm having trouble interpreting this table. Column 1: # of clients Column 2: TPS using 9.1beta2 unpatched Column 3: TPS using 9.1beta2 + fastlock patch Column 4: TPS using 9.1beta2 + fastlock patch + vxid patch Column 5: ??? At any rate, that is a big improvement on a system with only 8 cores. I would have thought you would have needed ~16 cores to get that much speedup. I wonder if the -M prepared makes a difference ... I wasn't using that option. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] FWD: fastlock+lazyvzid patch performance
- Цитат от Robert Haas (robertmh...@gmail.com), на 25.06.2011 в 00:16 - On Fri, Jun 24, 2011 at 3:31 PM, wrote: clients beta2 +fastlock +lazyvzid local socket 8 76064 92430 92198 106734 16 64254 90788 90698 105097 32 56629 88189 88269 101202 64 51124 84354 84639 96362 128 45455 79361 79724 90625 256 40370 71904 72737 82434 I'm having trouble interpreting this table. Column 1: # of clients Column 2: TPS using 9.1beta2 unpatched Column 3: TPS using 9.1beta2 + fastlock patch Column 4: TPS using 9.1beta2 + fastlock patch + vxid patch Column 5: ??? 9.1beta2 + fastlock patch + vxid patch , pgbench run on unix domain socket, the other tests are using local TCP connection. At any rate, that is a big improvement on a system with only 8 cores. I would have thought you would have needed ~16 cores to get that much speedup. I wonder if the -M prepared makes a difference ... I wasn't using that option. Yes, it does make some difference, Using unpatched beta2, 8 clients with simple protocol I get 57059 tps. With all patches and simple protocol I get 60707 tps. So the difference between patched/stock is not so big. I suppose the system gets CPU bound on parsing and planning every submitted request. With -M extended I get even slower results. Luben -- Perhaps, there is no greater love than that of a revolutionary couple where each of the two lovers is ready to abandon the other at any moment if revolution demands it. Zizek
