Re: Luajit string split much much slower that Lua string split
- From: Leo Razoumov <slonik.az@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Sun, 27 May 2012 10:27:37 -0400
On Sat, May 26, 2012 at 6:53 PM, Robert McLay <rtmclay@xxxxxxxxx> wrote:
>
> I have attached a complete example that takes a file and just counts lines.
> On my system with a file that has 250K lines and is 11MB big (Times in
> seconds)
>
> lua luajit
> read 0.0538 0.0588
> split 0.693 17.34
>
> Thanks,
Hmm... I tried your example and I see a different behavior.
For stock Lua-5.1.5:
time lua readMtx.lua bigfile
lines: 2097153
read 0.2915461063385
split 3.9440140724182
lua readMtx.lua bigfile 4.10s user 0.14s system 100% cpu 4.246 total
For LuaJIT latest GIT master [10b9ed37e0f]
time ./luajit-2.0/src/luajit readMtx.lua bigfile
lines: 2097153
read 0.20401906967163
split 1.3892159461975
./luajit-2.0/src/luajit readMtx.lua bigfile 1.48s user 0.12s system
100% cpu 1.602 total
LuaJIT is 2.8x times faster splitting strings. I am running
Ubuntu-10.04 (32-bit) virtual machine under Parallels on Mac OSX host
(10.6.8).
--Leo--
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