p23 schrieb:
Hi,
I've 3 server running apache,MySQL and memcached.
i monitor the CPU+Memory usage of MySQL.
it show when i'm using MySQL with memcached (dedicated server), the
cpu usage is very low but the memory quite higher a little bit. It's
not much, but i'm wonder why it goes higher (than MySQL with memcached
disabled) since items are already cached and memcached reside in
dedicated server. I run it many times and it shows the same result.
MySQL + query cache:
Mem: 45.0 %
Cpu: 19.0 %
MySQL + memcached:
Mem: 47.0 %
Cpu: 2 %
Thanks in advance :)
I don't know, how you are using memcached exactly, but if you are using memcached as an
object-cache for your application ist quite obvious, that a memcached needs more memory to
store needed informations.
In general I would advice you to be very carefull running multiple instances of memory and
connection (yes, a connection to localhost is still a connection) consuming entities on
one machine. In various scenarios this will produce unpredictable behavior.
Kind regards,
Jérôme
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