We're using Unicorn to serve a Rails app on a few app servers built on Amazon EC2 instances. Each of the xlarge EC2 instances have the equivalent of 8 CPUs, but it seems like our Unicorn master and 8 workers are only utilizing the first CPU. We've been watching the CPU graphs from collectd data when the website is under load, and only cpu-0 shows any activity ... the others seem to be idle, or minimally used by other services.
I had assumed that the OS would automatically allocate the Unicorn worker processes to use multiple CPUs, but now I'm not sure. I couldn't find anything about this in the Unicorn docs (except for the mention of the worker_processes configuration, which seems to imply that multiple CPUs would be used). Is there something that I'm not doing? Our EC2 instances are running Ubuntu 10.04 LTS with Linux kernel 2.6.32. Thanks in advance for any insights or suggestions. Nate Clark Pivotal Labs Singapore _______________________________________________ Unicorn mailing list - [email protected] http://rubyforge.org/mailman/listinfo/mongrel-unicorn Do not quote signatures (like this one) or top post when replying
