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Calloc

So if I'm understanding this correctly then won't we have high queue access contention since each thread would try to pull a vertex from the work queue? Is this better here rather than having a work queue per thread and maybe do work stealing?

jrgallag

The work queue could be implemented that way - remember that this is an abstraction presented to the programmer, rather than an implementation. GraphLab might even decide which type to use depending on the parameters of the system.