ardour/livetrax
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optimize LuaInstance::get_action_state, LuaInstance::get_hook_state

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Lua serialize() is called recursively and concatenates strings.
(in Lua that results in a new string on the stack, with 2 unused old
strings). Collecting garbage every time becomes expensive, so do it
only once at the end. GUI scripts are not memory limited anyway.
This commit is contained in:
Robin Gareus 2017-03-27 04:59:20 +02:00
parent 47ea6534d0
commit c3f2cff8bc
1 changed files with 9 additions and 5 deletions
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14
gtk2_ardour/luainstance.cc
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@ -977,7 +977,6 @@ LuaInstance::init ()
""
" local function serialize (name, value)"
" local rv = name .. ' = '"
" collectgarbage()"
" if type(value) == \"number\" or type(value) == \"string\" or type(value) == \"nil\" then"
" return rv .. basic_serialize(value) .. ' '"
" elseif type(value) == \"table\" then"
@ -985,7 +984,6 @@ LuaInstance::init ()
" for k,v in pairs(value) do"
" local fieldname = string.format(\"%s[%s]\", name, basic_serialize(k))"
" rv = rv .. serialize(fieldname, v) .. ' '"
" collectgarbage()" // string concatenation allocates a new string
" end"
" return rv;"
" elseif type(value) == \"function\" then"
@ -1600,7 +1598,15 @@ LuaCallback::get_state (void)
luabridge::LuaRef savedstate ((*_lua_save)());
saved = savedstate.cast<std::string>();
}
lua.collect_garbage ();
lua.collect_garbage (); // this may be expensive:
/* Editor::instant_save() calls Editor::get_state() which
* calls LuaInstance::get_hook_state() which in turn calls
* this LuaCallback::get_state() for every registered hook.
*
* serialize in _lua_save() allocates many small strings
* on the lua-stack, collecting them all may take a ms.
*/
gchar* b64 = g_base64_encode ((const guchar*)saved.c_str (), saved.size ());
std::string b64s (b64);
@ -1676,7 +1682,6 @@ LuaCallback::init (void)
""
" local function serialize (name, value)"
" local rv = name .. ' = '"
" collectgarbage()"
" if type(value) == \"number\" or type(value) == \"string\" or type(value) == \"nil\" then"
" return rv .. basic_serialize(value) .. ' '"
" elseif type(value) == \"table\" then"
@ -1684,7 +1689,6 @@ LuaCallback::init (void)
" for k,v in pairs(value) do"
" local fieldname = string.format(\"%s[%s]\", name, basic_serialize(k))"
" rv = rv .. serialize(fieldname, v) .. ' '"
" collectgarbage()" // string concatenation allocates a new string
" end"
" return rv;"
" elseif type(value) == \"function\" then"