Hi Evan,
On Mon, Jul 27, 2009 at 12:36 PM, Evan Felix<evan.fe...@pnl.gov> wrote:
> Can someone give me a run down of the memory needs of running a cosd? I?m
> trying to build a largeish test filesystem using virtual machines, and just
> starting the first cosd seems to take over a gig of memory. This makes it
> fairly hard to make a lot of VM?s on a single box. Is there a way to reduce
> the memory footprint.
>
> In my looking it seems I have over 38000 PG?s allocated, does this seem like
> a reasonable number?
The memory use you're seeing is proportional to the number of PGs. For a
default mkfs, it's the number of OSDs you specify * 64... did you specify
~600 osds?
The memory usage on the first OSD(s) will be higher because all of the pgs
will initially be allocated and created there. Once other osds start up
they'll get redistributed, so your memory usage per-osd will fall off
dramatically. Steady state should be under 100mb (assuming no active
recovery, etc. is going on).
Let me know if it's causing you problems as the other OSDs start up and
I'll see what I can do about memory consumption. It does sound like it's
higher than it should be.
sage
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