Small update. I have played with the GC and have run several tests. I manage to solve the problem by disabling the GC with GC.disable, but then my memory gets filled with garbages. I have also disabled hugepages on linux and no effects. Finally I've played with some of the parameters of the GC like the heap size, and reducing its activity to 0 (GC.count) but no changes. Every test have been performed on the same machine with the same parameters.
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