Linux Tests

CautionToTheWind · Post by **CautionToTheWind** » 18 Oct 2007, 14:50

I have been testing Spring in Kubuntu Feisty 32bit from the packages and self-compiled, and also under the 2.6.22 and 2.6.23 kernels. Some notes for those that might find it useful:

- The binary i compiled myself gained a noticeable increase in FPS. Maybe over 10%, which surprised me.

- The new kernel .23 and CFS scheduler make little difference since Spring is run alone without other big tasks and that situation is too simple to notice scheduler improvements.

- It still hangs (rarelly) in Linux. It does so in both kernels, compiled by me or not, and regardless of running Spring over my desktop or in a separate X session. When it hangs, the last drawn frame stays displayed, Spring stops using CPU and the rest of the system keeps working fine.

AMD 4600+ CPU, nv6 chipset, nvidia 7600GTS.

Relative · Post by **Relative** » 18 Oct 2007, 17:02

CautionToTheWind wrote:
- It still hangs (rarelly) in Linux. It does so in both kernels, compiled by me or not, and regardless of running Spring over my desktop or in a separate X session. When it hangs, the last drawn frame stays displayed, Spring stops using CPU and the rest of the system keeps working fine.

AMD 4600+ CPU, nv6 chipset, nvidia 7600GTS.

I too have had this problem since I started using spring on ubuntu. At first I thought it was just the ATi drivers crapping themselves so I never bothered to report it. Then after I built my current PC I noticed it still continued despite now having a Nvidia card. I think I have mentioned it a couple of times, but there is never any stacktrace or actions that explain it. It happens irregardless of whether I use a package or compile myself. It happens very very rarely rarely (1 out a 100).

Old Spec:
Intel Northwood @ 2.6Ghz, crappy generic dell motherboard that I can't remember, ATi 9800 pro

New:
E6750, intel P35, 8600 GTS

Kernels:All of them since about 6-7 months ago when I started using spring on ubuntu.

Tobi · Post by **Tobi** » 18 Oct 2007, 17:27

Did anyone already try to attach a debugger (gdb) to Spring (compiled with debugging enabled of course

) when it hangs?

(would probably need another PC and ssh for that I guess, unless you can still switch to a console using e.g. ctrl+alt+F1)

Relative · Post by **Relative** » 18 Oct 2007, 17:39

Tobi wrote:Did anyone already try to attach a debugger (gdb) to Spring (compiled with debugging enabled of course ) when it hangs?

(would probably need another PC and ssh for that I guess, unless you can still switch to a console using e.g. ctrl+alt+F1)

How can you run spring gdb after it happens? Also its so unpredictable and rare it would require having a debugger on at all times, and you might not ever get it.

CautionToTheWind · Post by **CautionToTheWind** » 18 Oct 2007, 20:47

I did that. Tobi told me how to do it and shared some scripts, and i replaced my install with a 100Mb debug binary running in gdb and saving the backtrace (using the windows lobby in wine, it was quite the monster my install). I sent you a few backtraces but unfortunately they were never useful.

Later on I had to stop playing Spring for some time and then did a clean install of the Linux and didn't set up the whole gdb stuff again.

YokoZar · Post by **YokoZar** » 19 Oct 2007, 08:16

CautionToTheWind wrote:I have been testing Spring in Kubuntu Feisty 32bit from the packages and self-compiled, and also under the 2.6.22 and 2.6.23 kernels. Some notes for those that might find it useful:

- The binary i compiled myself gained a noticeable increase in FPS. Maybe over 10%, which surprised me.

What kind of CPU and compile options are you using? The packages are built in pbuilder on my Athlon 64 box with defaultish options.

If you have something later (or an intel CPU), it wouldn't surprise me if you were getting a more optimized build.

Tobi · Post by **Tobi** » 19 Oct 2007, 09:48

Well if it would automatically assume -march= options I doubt the difference would be that big... I tried some of those once and didn't measure a single % speed difference.

CautionToTheWind · Post by **CautionToTheWind** » 19 Oct 2007, 12:26

I just didn't change any options whatsoever. I apt-get install the dependency packages and then run scons configure and scons. With an AMD cpu. And with whatever default options Kubuntu ships with.

YokoZar · Post by **YokoZar** » 20 Oct 2007, 01:59

CautionToTheWind wrote:I just didn't change any options whatsoever. I apt-get install the dependency packages and then run scons configure and scons. With an AMD cpu. And with whatever default options Kubuntu ships with.

Hmm...

The default options when compiling in a terminal might not be the same as the defaults in the package build rules.

If I could trouble you to make a test, build the package from source. If you know how to do it from the files in the link I gave, do that.

Otherwise, just wait for me to get the repository working and then you can do apt-get --build source.

CautionToTheWind · Post by **CautionToTheWind** » 20 Oct 2007, 23:11

Yokozar, can you point me to instructions to do what you suggest?

YokoZar · Post by **YokoZar** » 22 Oct 2007, 08:16

CautionToTheWind wrote:Yokozar, can you point me to instructions to do what you suggest?

http://spring.clan-sy.com/phpbb/viewtopic.php?t=12469

apt-get update
apt-get build-dep spring
apt-get --build source spring
Then you'll get your own deb to play with :)

Scram80 · Post by **Scram80** » 23 Oct 2007, 13:30

I did backtraces on a few of these 'black last frame' hangs, too.

I don't have them around anymore, but what i noticed in every:

it did hang in the SDL Sig11 handler

in most times the exception seemed to have been caused by malloc or free

so i assume there is heap memory corruption going on somewhere...

CautionToTheWind · Post by **CautionToTheWind** » 26 Oct 2007, 13:50

I've had an interesting new development on the linux hangs. Yesterday i hanged, and when i closed it and cursed, i noticed someone else cursing in the lobby. Turns out he crashed at the same time i "hanged". I asked, and he is running Vista, not Linux.

Maybe it could be that the linux hangs are the same as the regular windows crashes (Spring has crashed dialog), but because of platform differences the failure mode is different?

That would still leave some crashes to fix, but imho much better than having a tricky platform specific bug that won't show its damm head.

Tobi · Post by **Tobi** » 26 Oct 2007, 16:19

Is it actually reproducable with .cheat .crash?

I doubt it but if it is it would making fixing a lot easier.

CautionToTheWind · Post by **CautionToTheWind** » 26 Oct 2007, 21:42

.cheat .crash behaves like a clean exit to me. It doesn't hang on the last frame. Instead it closes and the rest of my spring script runs as normal.

LordMatt · Post by **LordMatt** » 27 Oct 2007, 00:00

CautionToTheWind wrote:I've had an interesting new development on the linux hangs. Yesterday i hanged, and when i closed it and cursed, i noticed someone else cursing in the lobby. Turns out he crashed at the same time i "hanged". I asked, and he is running Vista, not Linux.

Maybe it could be that the linux hangs are the same as the regular windows crashes (Spring has crashed dialog), but because of platform differences the failure mode is different?

That would still leave some crashes to fix, but imho much better than having a tricky platform specific bug that won't show its damm head.

Oo I thought it was well known that linux hangs = windows crashes. This happens to me quite commonly, that when I hang someone else crashes. I have never had spring produce a proper crash in infolog.txt.

Post by **Kloot** » 27 Oct 2007, 00:13

Stacktraces aren't generated on Linux
(due to binary identfication issues).

LordMatt · Post by **LordMatt** » 27 Oct 2007, 00:31

Well what is it supposed to do when it crashes?

Tobi · Post by **Tobi** » 27 Oct 2007, 11:32

Just close the window and output something like "Segmentation fault" on the console, if it was started from a console.

CautionToTheWind · Post by **CautionToTheWind** » 27 Oct 2007, 12:31

LordMatt wrote: Oo I thought it was well known that linux hangs = windows crashes.

It was not known to me.

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