add periodic gc.collect() callback to workers
#416
+60
−2
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DO NOT MERGE
We should test and fine-tune (especially the frequency argument) this periodic callback.
This might be useful, because
daskdoes callgc.collect()only during spilling or pausing, but that's likely too late.We might be able to call
gc.collecteven much more frequently, e.g. in the microseconds regime.