Re: Help in avoiding a query 'Warm-Up' period/shared buffer
От | Jim C. Nasby |
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Тема | Re: Help in avoiding a query 'Warm-Up' period/shared buffer |
Дата | |
Msg-id | 20060106031421.GM43311@pervasive.com обсуждение исходный текст |
Ответ на | Re: Help in avoiding a query 'Warm-Up' period/shared buffer (David Lang <dlang@invendra.net>) |
Список | pgsql-performance |
On Thu, Jan 05, 2006 at 06:50:22PM -0800, David Lang wrote: > On Thu, 5 Jan 2006, Mark Liberman wrote: > > >Obviously, I will be testing this - but it might take a few days, as I > >haven't > >figure out how to simulate the "period of inactivity" to get the data > >flushed > >out of the cache ... so I have to run this each morning. > > cat large_file >/dev/null > > will probably do a pretty good job of this (especially if large_file is > noticably larger then the amount of ram you have) The following C code is much faster... /* * $Id: clearmem.c,v 1.1 2003/06/29 20:41:33 decibel Exp $ * * Utility to clear out a chunk of memory and zero it. Useful for flushing disk buffers */ int main(int argc, char *argv[]) { if (!calloc(atoi(argv[1]), 1024*1024)) { printf("Error allocating memory.\n"); } } Compile it and then pass in the number of MB of memory to allocate on the command line. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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