Minimal testing seems to show it working and surviving through conditions where previously it would run out of memory on STM32 w/ 64k SRAM.
-jsnyderOn May 10, 2009, at 5:48 AM, Robert G. Jakabosky wrote:<full_gc_on_alloc.patch>I finally got a working i686-elf toolchain compiled and eLua to boot in a VirualBox instance.
Also I found out that eLua will not start when using the Lilo boot loader. I was trying Lilo first since it is smaller then grub and I thought it would be easier to install eLua on a floppy. Turned out that it was much easier to install grub on a floppy and there was enough room for eLua too.
On Saturday 09, jbsnyder@fanplastic.org wrote:
>
> <[hidden email]> wrote:
> >
> > Many, many thanks for this !!! I wanted to do this for quite a while
> > now, but didn't find the time to do it. Your patch is excellent for
> > eLua and its goals, so it's a Great Thing to have it running on our
> > targets. Thanks again.
>
> Ditto. Thanks for getting this up and going. I will do some testing
> with this, this weekend if I get a chance. I'm curious if this might
> allow pushing limits a bit more where we would previously run out of
> memory where the problem could be helped by emergency gc.
With the patch you can now set a memory limit when starting a Lua script from the eLua shell.
eLua# lua -m 51 /rom/life.lua
The '-m' option lets you set the memory limit in Kbytes.
51Kbytes was the lowwest I was able to get life.lua to run at with eLua. On my linux host vanilla Lua with the EGC patch can only run life.lua with a minimal memory limit of 60Kbytes. Looks like the ROTables in eLua saved about 9Kbytes here.
The attached patch is for stress testing the EGC only. It forces a full GC cycle on every allocation, so it is very slow (life.lua required over 30 minutes to run, compared to 4 minutes). I was able to run all the Lua scripts that eLua includes by default with that stress testing enabled.
Normally I would also run the stress testing under valgrind to test for any bad memory accesses, but that is only possible if eLua is run as an app. under a host OS.
> > And I couldn't agree with you more, and this why I feel so excited
> > for having EGC in eLua. I'll have to think of a good batch of tests
> > for making your patch shine in its full potential :)
>
> Would the torture tests for the egc patch work in really low memory
> conditions like with 64k of SRAM?
>
> I think we should also have a general test suite for to simplify the
> verification of builds across our multiple platforms. I think I may
> start after luarpc is working with eLua.
It should be possible to pick torture tests that will work with just 64k of memory.
I normally run the Lua scripts from:
http://shootout.alioth.debian.org/
when stress testing the EGC patch. Some of those scripts will require more then 64k for that dataset that they process.
--
Robert G. Jakabosky
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https://lists.berlios.de/mailman/listinfo/elua-dev--James SnyderBiomedical EngineeringNorthwestern Universityph: (847) 448-0386
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