Re: Data-dependent slowdown in loop involving io.lines()
- From: Joshua Jensen <jjensen@xxxxxxxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Fri, 07 Nov 2014 10:24:52 -0700
Tudor Bosman wrote on 11/7/2014 9:09 AM:
On Fri Nov 07 2014 at 4:20:02 AM Mike Pall <mike-1411@xxxxxxxxxx
<mailto:mike-1411@xxxxxxxxxx>> wrote:
A sparse hash inevitably shows worst case behavior like this. It's
just a matter of trying hard enough to find such an example (with
either Lua or LuaJIT).
The point is that we didn't try hard enough; the example I gave is
contrived, but that's only because I didn't want to show our full
pathnames in the example (also, because I didn't want to attach the
original 98MB file).
This is not uncommon. The data set I work with (tens of thousands of
filenames) has Lua 5.1 running many *times* faster than LuaJIT.
I'd love to see LuaJIT's string internals improved, too.
-Josh
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