Am Mittwoch, 17. November 2010, 18:53:07 schrieb Goswin von Brederlow: > Andreas Røsdal <andre...@pvv.ntnu.no> writes: > > On Tue, 16 Nov 2010, Matthias Pfafferodt wrote: > >> After the increase of the number of players and the map size I did plan > >> a check of the memory requirement of the different freeciv versions. I > >> finished this now and the attached pdf files shows some results. > >> > >> The first two pages show the RAM used by the server as listed by pmap. A > >> savefile with the default settings and aifill = X, map size = Y at turn > >> 100 was loaded. Only one value of X or Y was changed while the other > >> was set to 10. > >> > >> The requirements increase fro release to release; but with 2.3 it goes > >> down for bigger maps. I also tested a game with aifill 100 and mapsize > >> 100 - the server allocates up to 900MB RAM! > > With 2GB ram and 2GB swap I could not play that. I run out of memory.
I would be nice if you could try it - in my measurements there was enough RAM (8GB available). Perhaps the server uses less if less memory is available? > > >> The last two slides show the size of the savegame. For small number of > >> players and map sizes is is OK. But increasing these numbers the size > >> of the savegame increases and, if both are set to 100 the uncompressed > >> savegame reaches a size of over 100MB. For such savegames the time > >> needed to compress the data is significant. > > Full ACK. And the disk fills up quickly with autosave games. Some sort > of rotating would be nice (last 20 saves) or some sparse keeping (keep > games 1,2,3,...,10 turns ago, every 10th turn till 100 turns ago, every > 100th turn till 1000 tuns ago). This is hard to do n a secure way because files are deleted. Also the server would have to keep track of the save games. Perhaps an new autosave option 'last 3 games'. There the server keeps 3 files as FIFO, i.e freeciv-autosave_01.sav.bz2 freeciv-autosave_02.sav.bz2 freeciv-autosave_03.sav.bz2 And for each turn it creates a new file (freeciv-autosave_00.sav.bz2) and after it is saved correctly, the last is deleted and al are moved one down ... > > >> For the client, the memory consumption is increased from 1.14 to 2.2 > >> (xaw to gtk2). After that, nearly no change is visible. The client uses > >> up to 500MB, mostly for the graphical toolkit. > >> > >> If there are questions please ask. > > > > These statistics are very interesting. It is a good idea to keep an > > eye on the memory usage, since this would allow the game to scale > > better. Another aspect of memory usage that I would also find > > interesting, is how the memory usage scales when running multiple > > Freeciv servers on the same host. For example, does running 10 servers > > at the same time also require 10 times the memory? > > Basically yes. > > Although the amount shared is static. The amount not shared goes up map > size and players. So if it was 9.5 times before it now becomes 9.7 times > if you use larger maps / more palyers. That's right. For only increased players or map size it is linear but increasing both options is nearly quadratic. > > > Also the memory usage goes way up with time. More of the map is known to > players and AIs, more cities and units are created and big gotos and war > maps are created. Measuring the memory at the start of the game might > not be the best measurement. Maybe let it play 100 turns and then > measure. Or even better, plot the memory usage after every turn. The measurements presented in the file are all for a savegame after 100 turns. But after 200 turns it could be more ... (or less if a lot of players are dead; but I'm not sure about this). Plotting the memory usage after each turn would only be practical if there is some kind of automatic tool for this. > > Other stats that would be usefull would be statistics about number of > players remaining, number of cities and number of units in the > game. Maybe something someone could patch into the server. > > MfG > Goswin > > PS: I also found that XOrg uses a huge amount of memory when playing > freeciv. Is freeciv leaking server side pixmaps? I hope not but ... Matthias > > _______________________________________________ > Freeciv-dev mailing list > Freeciv-dev@gna.org > https://mail.gna.org/listinfo/freeciv-dev _______________________________________________ Freeciv-dev mailing list Freeciv-dev@gna.org https://mail.gna.org/listinfo/freeciv-dev
