2011/4/14 Florian Weimer <fweimer@xxxxxx>: > * Jesper Krogh: > >> If you have a 1 socket system, all of your data can be fetched from >> "local" ram seen from you cpu, on a 2 socket, 50% of your accesses >> will be "way slower", 4 socket even worse. > > There are non-NUMA multi-socket systems, so this doesn't apply in all > cases. (The E5320-based system is likely non-NUMA.) > > Speaking about NUMA, do you know if there are some non-invasive tools > which can be used to monitor page migration and off-node memory > accesses? I am unsure it is exactly what you are looking for, but linux do provide access to counters in: /sys/devices/system/node/node*/numastat I also find usefull to check meminfo per node instead of via /proc -- Cédric Villemain 2ndQuadrant http://2ndQuadrant.fr/ ; PostgreSQL : Expertise, Formation et Support -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
