Massive CPU spike on cache server
We're running two Membase memcache servers in our dev environment at the moment using Amazon EC2 instances, and over the weekend one of the servers' CPU just shot up from close to zero to 100% in an instant, under very little load (we had a few bots running but the load is consistent throughout).
I've attached a snapshot of the CPU graph and the diagnostic output on that server.
This is the second time we have seen this in about a week and having read through a similar thread:
I checked the history and this is a different server to the one which spiked the last time..
Strange though, the average response time from the cache cluster (of these two servers) are only slightly higher than what we were seeing before the server spiked.
I'm just wondering if any of you guys managed to get to the bottom of why this sudden spikes in CPU happens and what we could do to stabilize the server without restarting the memcache.exe process?