C LuaJit Profiling

Question

I have following execution stack:

C++

C Lua API

LuaJIT

C functions - my own functions, injected to Lua via C-Lua-API which called from lua script

I want to profiling this code. And I want to know percentage time spent in luajit phase.

I see come problems here. If I will compile luajit with flags something like -pg -fprofile-generate -fprofile-use it will be not the same that luajit compiled for production build.

Is there any way to figure out what's going on in LUAJit phase?

Good example of this executions stack - openresty

Where is the code?

Lamar
– Lamar

2017-12-04 10:16:56 +00:00
Commented Dec 4, 2017 at 10:16 — Lamar
– Lamar, Commented Dec 4, 2017 at 10:16
As example, u can see open-resty source.

Eendru
– Eendru

2017-12-04 10:45:50 +00:00
Commented Dec 4, 2017 at 10:45 — Eendru
– Eendru, Commented Dec 4, 2017 at 10:45

Eendru · Accepted Answer · 2017-12-07 07:05:30Z

It's good idea use perf utility and flamegraph. And there is no reason to recompile with gcc flags like -fomit-frame-pointer, -fprofile-generate, -fprofile-use.

perf doesn't need this flags for collect information. Only -pg flag.

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