The extra workers may not be added, even though you appear to call addprocs in the (julia) script. I’m surprised it works at all: when I call addprocs through pyjulia I get a segfault in both 0.5 and recent master due to GC corruption (GC error (probable corruption), when it is feeling nice; usually a nasty backtrace).
edit: oh, you are using Julia 0.3. That may be why. At this point 0.3 is not really supported so I’m not going to try to debug there. Please try with 0.5.
They’re not linked, but most of the people who answer SO are also on here, so please only post in one place at a time.