Hello!
On Wed, Feb 26, 2014 at 2:39 PM, Aapo Talvensaari wrote:
> I really do not know why my posts get deleted in this message board.
>
Your last few posts were marked as spam by Google and were waiting for
my moderation. They were not deleted.
> There seems to be some regressions with LuaJIT (Lua 5.2.2 seems to work
> little bit better on large iteration counts).
Several suggestions on performance tuning:
1. Try running your Lua scripts with luajit's -jv option to see what
is aborting JIT compilation. Work-around the NYI items shown in the
output.
2. Try running your Lua scripts with the builtin low-overhead
profiler, for example, with the -jp=vf20 option. See
http://repo.or.cz/w/luajit-2.0.git/blob_plain/refs/heads/v2.1:/doc/ext_profiler.html
for details. (Ensure your Lua scripts run long enough like seconds
because the profiler is based on sampling).
3. Try generating a C-land on-CPU flame graph for the luajit process
running your scripts:
https://github.com/agentzh/nginx-systemtap-toolkit#sample-bt This
graph can show CPU time distribution on a lower level, the VM level,
than LuaJIT's builtin profiler (which works on the Lua code level).
Best regards,
-agentzh
