John R Pierce <pierce@xxxxxxxxxxxx> wrote: > On 10/9/2014 1:13 PM, Dennis wrote: >> Hi, a little off the general topic but I am just wondering if the “tar >> -cf - pgdata | wc -c” trick can be used as general trick to pre-warm >> the cache? > > I wouldn't do this if your pgdata is larger than about 50% of your > physical ram. Nor would I do this if pgdata is anywhere near the size of a memory segment on a NUMA machine. I have seen cache pre-warming through a single process on NUMA absolutely kill performance. -- Kevin Grittner EDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
