It is not, but its on my TODO list, and I have also observed similar behavior at...

derekcollison on Dec 7, 2012 | parent | context | favorite | on: ~2M msgs/second messaging system written in Go

It is not, but its on my TODO list, and I have also observed similar behavior at times. I have taken care to make sure the synchronization is efficient, but running the test is needed to get the real results.