Florian Weimer <f...@deneb.enyo.de> writes: > * Tom Lane: >> On Linux (RHEL6, 2.4GHz x86_64), I find that gettimeofday(), >> clock_gettime(CLOCK_MONOTONIC), and clock_gettime(CLOCK_REALTIME) >> all take about 40ns. Of course gettimeofday() only has 1us resolution, >> but the other two have perhaps 10ns resolution (I get no duplicate >> readings in a tight loop).
> Isn't this very specific to kernel and glibc versions, depending on > things like CONFIG_HZ settings and what level of vDSO support has been > backported? No doubt, but I have yet to find a platform where clock_gettime() exists but performs worse than gettimeofday(). Do you know of one? regards, tom lane -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers