[graph-tool] memory handling when using graph-tool's MCMCs and multiprocessing on large networks

hi, i was wondering if anyone had any tips on conserving memory when running graph-tool MCMCs on large networks in parallel. i have a large network (2GB), and about 260GB of memory, and was surprised to receive a MemoryError when i ran 10 MCMC chains in parallel using multiprocessing. my impression is that MCMC was relatively light on memory. cheers, -sam