Computing on a machine with 54 cpus, I parallelized a sage computation, running 40 sage scripts in the background at the same time. The strange thing (with narrowed down test examples) is: While each script for itself would need about 1s to finish, running these scripts in parallel do not finish even after 30m accumulated cpu time! Do several running instances of sage conflict with each other? I checked that each process gets about 20% cpu time (it should be 100%, because there are no other processes consuming considerable cpu), but even given that the total time should be a few seconds, and not more than an hour!
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