On Fri, 28 Jan 2005, Oleg Bartunov wrote:
On Thu, 27 Jan 2005, Tom Lane wrote:
Oleg Bartunov <oleg@sai.msu.su> writes:Day ago we run 'vacuum verbose analyze;' and now we're observing strange output (see below). We see many repeated passes through the table 'usno' and all indices (2).
Nothing strange about it: that's how vacuum deals with large tables. You can reduce the number of passes over the indexes by increasing maintenance_work_mem (aka vacuum_mem). It looks like you have that set to 16MB, which is enough to hold about 2.79M 6-byte CTIDs. When that fills up, we have to go and clean out the corresponding index entries before we resume scanning the heap.
I've increased maintenance_work_mem to 65536 (4x default value) and now I see postmaster eats more than 1Gb memory !
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20458 postgres 15 0 1350m 522m 204m D 8.0 51.6 1:08.26 postmaster
Is this normal ? I've also increased checkpoint_segments to 12, but it shouldn't affect to memory.
Memory growth stoped at 1.8Gb
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20458 postgres 15 0 1902m 503m 204m D 5.9 49.7 13:59.61 postmaster
Regards, Oleg _____________________________________________________________ Oleg Bartunov, sci.researcher, hostmaster of AstroNet, Sternberg Astronomical Institute, Moscow University (Russia) Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/ phone: +007(095)939-16-83, +007(095)939-23-83
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