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- Subject: Re: Lua need 1M memory?
- From: Mike Pall <mikelu-0611@...>
- Date: Tue, 14 Nov 2006 13:08:34 +0100
jason zhang wrote:
> I build a Lua5.1 interpreter in Linux, without any library. From the /proc/pid/status,
> It show that the Lua interpreter use about 1M RSS memory. Is this the minimum memory usage of Lua?
No. You are counting libc, libm, libdl, /lib/ld overhead, too.
And most of this is shared with other processes. Even the Lua
part is mostly shared code/data. You can get the heap allocation
with collectgarbage("count") (in Kilobytes).
You want to have a look at:
# Shows the static code/data size:
size `which lua`
# The first few lines are due to Lua, the rest is libc et al.
# The libc heap is usually overallocated and only a few K are committed.
lua -e 'os.execute("cat /proc/$PPID/maps")'
* read-only (shared) code/data: 40K-200K, depending on compiler
options (-Os vs. -O3) and whether the parser is included.
This is for x86 code; somewhat more for most other (RISC) CPUs.
* read-write heap: 18K with standard libs, as low as 1K without.