Posted by technicalknockout on November 2, 2012 at 5:07pm
Just recently setup new relic for a site and was surprised to see how much of the server's response time is being spent on memcache reads/writes. On a sample response, the breakdown is something like this:
PHP: 312 ms
Database: 143 ms
Memcache: 201 ms
External Web Service: 17 ms
Am I correct in thinking the memcache time is way too high? Or is this similar to other people's experience?
Thanks in advance for your thoughts.
Categories: high performance, memcache
Comments
How many requests to memcache
How many requests to memcache are made per page load?
Is memcache on the same server, or do the requests go out over the network?
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Dave Hansen-Lange
Director of Technical Strategy, Advomatic.com
Pronouns: he/him/his
looks roughly around 60
looks roughly around 60 requests per page load from the 'memcache statistics' and the requests go over a LAN
Which makes 3.35ms per
Which makes 3.35ms per request. What's your ping time between the web heads and the memcache server?
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Dave Hansen-Lange
Director of Technical Strategy, Advomatic.com
Pronouns: he/him/his
just got on and did a quick
just got on and did a quick ping and got:
37 packets transmitted, 37 received, 0% packet loss, time 35999ms
min/avg/max/mdev = 0.316/0.500/0.897/0.096 ms
so with the averages and a little arithmetic ...
3.35 ms memcache avg
- 0.50 ms avg network latency based on ping avg
2.85 ms memcache processing per request
Does that sound about right or does it sound like it's lagging?