We used the C gearman server from gearman.org, and it was highly unstable and very slow (added an extra 10-100ms to a job, which was noticeable in the UI), and

We used the C gearman server from gearman.org, and it was highly unstable and very slow (added an extra 10-100ms to a job, which was noticeable in the UI), and did other crazy things like return data from other jobs when the frequency got too high. We've since moved to the original Danga Perl daemon (rather than invest time switching message queues), and it's faster, uses less memory, and more stable. Next step is to move to a different MQ. In our application we don't need persistence especially, so I'm thinking zeromq.