Thanks David...
2009/5/28 David Rees <dree...@gmail.com> > On Thu, May 28, 2009 at 11:50 AM, Fabrix <fabrix...@gmail.com> wrote: > > Monitoring (nmon, htop, vmstat) see that everything is fine (memory, HD, > > eth, etc) except that processors regularly climb to 100%. > > What kind of load are you putting the server under when this happens? > I have many windows clients connecting to the database for odbc, they do select, insert and update data. All these operations are all answer very quickly in less than 1 second are well optimized, but when processors go up to 100% All queries go up from 10 to 18 seconds, and are the same type of operations when this happends. > > I can see that the processes are waiting for CPU time: > > > > procs -----------memory---------- ---swap-- -----io---- --system-- > -----cpu------ > > r b swpd free buff cache si so bi bo in cs us sy > id wa st > > 0 0 0 47119688 117420 17142044 0 0 0 200 1545 1810 1 > 1 98 0 0 > > 318 0 0 47116464 117440 17142052 0 0 0 532 1416 2396 1 > 0 99 0 0 > > 500 0 0 47115224 117440 17142052 0 0 0 0 1118 322144 > 91 5 4 0 0 > > 440 0 0 47114728 117440 17142044 0 0 0 0 1052 333137 > 90 5 5 0 0 > > 339 0 0 47114484 117440 17142048 0 0 0 0 1061 337528 > 85 4 11 0 0 > > 179 0 0 47114112 117440 17142048 0 0 0 0 1066 312873 > 71 4 25 0 0 > > 5 1 0 47122180 117468 17142028 0 0 192 3128 1958 136804 > 23 2 75 1 0 > > 3 0 0 47114264 117476 17142968 0 0 608 5828 2688 4684 7 > 2 89 2 0 > > Wow, that's some serious context-switching right there - 300k context > switches a second mean that the processors are spending a lot of their > time fighting for CPU time instead of doing any real work. > > It appears that you have the server configured with a very high number > of connections as well? My first suggestion would be to look at a way > to limit the number of active connections to the server at a time > (pgPool or similar). yes, i have max_connections = 5000 can lower, but at least i need 3500 connections > > > -Dave >
