Am Dienstag, 15. November 2011, 23:55:42 schrieb Michal Mazurek:
> My sparc64 502mhz is taking 4 minutes now to /save a game. I tried poor
> mans optimization and inlined a couple of functions. I tested it on a
> 8x3400mhz intel i7. The test .serv was loading the game, and saving it
> 10 times. I managed to only go down to 11.76 from 13.56 seconds, that's
> not very much. Most of the time is spent doing real stuff, so i guess
> 500mhz is not adequate to run games with max map. About 5 seconds of
> that time is just starting the server and loading the map.
>
> The function tile_index is called 495681563 times, I cant see how this
> can be cut down.
>
> sg_save_player_vision is called 370 times and takes most time, 12%. But
> it seems to be doing real stuff, also hard to cut down. And even if it
> is cut down, it's still only 12%.
>
> A decent computer saves the game rather fast, so I just guess my
> computer is just too old to run longturn games.
One thing to speed up saving a game would be a better handling of the saving
each part of the map. In sg_save_player_vision() the macro SAVE_MAP_CHAR is
called several times. Each (!) time it iterates over all tiles (= get tile
from x, y coordinates) and saves only one part of the vision map definition
(terrain, resources, (owner), specials, bases, update time). If this could be
changed to one loop it would help.
Similar optimisation could be done for sg_save_map_known(); perhaps even all
in one loop? (loop 1: y = lines; inner loop: x values; each part to be saved).
> However, I think that inlining functions like:
> int player_slot_count(void)
> {
> return (MAX_NUM_PLAYER_SLOTS);
> }
> would actually not only be faster, but also take less space.
I not sure that the rules are for inlining functions. In coding style only the
use of inline functions instead of macros is stated.
I posted this as gna patch (request) #3058 (https://gna.org/patch/index.php?
3058).
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