That is not normal. I would guess that you have some network issues on
your server(s). Why are you running 3 instances of memcached per server?
That seems a bit silly.
Brian.
http://brian.moonspot.net
On 7/25/11 6:57 AM, benjabcn wrote:
Using : Nginx + PHP-FPM on Gentoo.
PHP 5.4.3 with PECL:Memcache 3.0.5
40 Web servers and 2 memcache servers (3 instances of memcached on
each) with plenty of CPU and RAM, they are not loaded at all. Each
memcached instance receives about 3,000 GET/s.
I'm using both APC and Memcached. I had to setup a "two-layers"
caching system. First I'm caching into Memcached and then caching into
APC. I guess it's pretty dirty but that's the only solution I found to
reduce significantly the amount of GET to Memcache.
APC is local to each web obviously and Memcache is going through
network, so I assumed it was normal that APC would be much faster. But
somehow I feel something's wrong because Memcache sometimes is really
slow, and eventully even hit the 1s timeout.
I have done a small and stupid benchmark :
---------------
Testing 1000 GETs.
Value size : 149780 Bytes
Memcache Testing...
Value size : 149780 Bytes
Time: 13.78 seconds.
APC Testing...
Value size : 149780 Bytes
Time: 0.31 seconds.
---------------
Would you say this is normal response time? And normal to see APC that
much faster?
I'm not even sure how to debug this.
I tested this script but not sure if this is useful :
./mc_conn_tester.pl 10.0.0.23:11211 1000 1
Averages: (conn: 0.00050306) (set: 0.00057981) (get: 0.00046550)
Any help is welcome.
