memcached not using allocated memory
marcus at synchromedia.co.uk
Fri Apr 20 07:18:57 UTC 2007
On 19 Apr 2007, at 22:15, Lewis, Bill wrote:
> Why does a "SERVER_ERROR out of memory" error occur when stats say
> there is plenty of memory available? I am loading objects that are
> all 16394 bytes and using the default growth factor of 1.25.
> According to the stats the cache is only 55% full. Where is the
> other 45%? Relevant stats below.
I'm not familiar with the internals, but I believe that memory chunks
are allocated in power-of-2 sized chunks. 16394 is 10 bytes over
16384, which is 2^14, so your 16394 bytes will be stored in a 32768
size chunk (2^15), hence the wastage. It's just unfortunate that your
data is that size - it couldn't get much less efficient! That's my
theory anyway, could be completely wrong of course!
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