Edit your nginx.conf
file, add a location
into your server {}
block:
location = /lua {
default_type text/plain;
content_by_lua '
if jit then
ngx.say(jit.version)
else
ngx.say("Not LuaJIT!")
end
';
}
Then start your nginx server and then access /lua in curl or in your favorite web browser. If you see outputs like "LuaJIT 2.0.2", then you're using LuaJIT; otherwise, if you see "Not LuaJIT!", then you're using the standard Lua 5.1 interpreter.
Another quicker way is to check the Lua DSO file linked with your nginx executable if dynamic linking is used (which is usually the case):
ldd /path/to/your/nginx/sbin/nginx|grep -i lua
If you see something like
libluajit-5.1.so.2 => /usr/local/openresty-debug/luajit/lib/libluajit-5.1.so.2 (0x00007fb3d38f6000)
Then you're using LuaJIT.