Hi, list!
I'm back again with another silly benchmark (thus, sorry for HTML
formatting).
Now I'm finding the fastest way to calculate sum of values in array
part of the table (ignoring hole issues).
Source: http://tinyurl.com/yh6mvc3
lua
-------------------------------------------------------------------
name | rel | abs s / iter = us (1e-6 s) / iter
-------------------------------------------------------------------
unrolled | 1.0000 | 45.37 / 10000000 = 4.537000 us
numeric_for | 1.2771 | 57.94 / 10000000 = 5.794000 us
numeric_while | 1.6244 | 73.70 / 10000000 = 7.370000 us
pairs | 3.2927 | 149.39 / 10000000 = 14.939000 us
ipairs | 3.6846 | 167.17 / 10000000 = 16.717000 us
next | 4.3198 | 195.99 / 10000000 = 19.599000 us
luajit2
-------------------------------------------------------------------
name | rel | abs s / iter = us (1e-6 s) / iter
-------------------------------------------------------------------
unrolled | nan | 0.00 / 10000000 = 0.000000 us
numeric_for | inf | 1.90 / 10000000 = 0.190000 us
ipairs | inf | 4.37 / 10000000 = 0.437000 us
numeric_while | inf | 4.43 / 10000000 = 0.443000 us
pairs | inf | 35.79 / 10000000 = 3.579000 us
next | inf | 45.99 / 10000000 = 4.599000 us
I'm surprised that (as my colleague pointed out to me), in plain Lua,
/pairs/ is *faster* than /ipairs/.
Also, in unpatched LuaJIT2 b2, /pairs/ is *much* *slower* than
/ipairs/ and numeric for... I guess this is another one of beta issues
(or I've screwed the benchmark somewhere), but reporting it just in
case anyway.
Alexander.
P.S. To reproduce, clone
http://github.com/agladysh/luamarca/
and run
$ ./run_benchmark.sh bench/accum.lua 1e7
