Performance compared to Lua #149
Description
Is your feature request related to a problem? Please describe.
Comparing performance of json parser with Lua show that PeppaPEG is 2x memory hungry and takes 2x more time.
Describe the solution you'd like
At least the same performance or better.
Here is the Lua script using dkjson (http://dkolf.de/src/dkjson-lua.fsl/home):
local json = require ("dkjson")
local str = io.open(arg[1]):read("a*")
local obj, pos, err = json.decode (str, 1, nil)
if err then
print ("Error:", err)
else
for k,v in pairs(obj) do
print (k, type(v))
end
end
And here is the script testing all with this file as imput (https://github.com/rust-lang/rls/blob/master/rls-analysis/test_data/rls-analysis/librls_data.json 7MB) :
#!/bin/sh
fname="rustc-1.49.0-src/src/tools/rls/rls-analysis/test_data/rls-analysis/librls_data.json"
/usr/bin/time lua decode-json-file.lua $fname
/usr/bin/time lua decode-json-file-lpeg.lua $fname
/usr/bin/time PeppaPEG-DAD/cli parse -G json.peg -e entry $fname > /dev/null
And here is the output:
./test-big.sh
compilation table
refs table
config table
defs table
imports table
version string
relations table
impls table
prelude table
macro_refs table
1.23user 0.00system 0:01.23elapsed 100%CPU (0avgtext+0avgdata 59844maxresident)k
0inputs+0outputs (0major+16432minor)pagefaults 0swaps
config table
imports table
defs table
compilation table
refs table
impls table
macro_refs table
version string
relations table
prelude table
0.37user 0.01system 0:00.38elapsed 99%CPU (0avgtext+0avgdata 37248maxresident)k
0inputs+0outputs (0major+10731minor)pagefaults 0swaps
0 true
2.87user 0.02system 0:02.89elapsed 99%CPU (0avgtext+0avgdata 124372maxresident)k
0inputs+0outputs (0major+30745minor)pagefaults 0swaps