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The docs [1] say:

> A newly spawned Erlang process uses 309 words of memory in the non-SMP emulator without HiPE support. (SMP support and HiPE support both add to this size.)

And a word is the native register size, so 4 or 8 bytes these days, so fairly small, but not 64 bytes small.

[1] http://erlang.org/doc/efficiency_guide/processes.html