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"Javier Guerra" <> writes:

> On 2/27/08, Chris <> wrote:
>>  which use about 1.3 GB of RAM, after the collection the process it is
>>  still using 1.3 GB of RAM.
> AFAIR, on unix (and unix-like) systems, a process never releases
> memory back to the OS, but it's managed internally as free.

But he said that he is running "Linux" which likely means "GNU/Linux",
namely glibc.  In that case, at least larger allocations are handled by
privately memory-mapping /dev/zero, a technique making the operating
system responsible for fragmentation.  Maybe the allocation requests
from Lua to the C library are too small to trigger this mechanism?

David Kastrup