Occassional 'stutter' when finishing a lap

[Korodny]

I'm playing dustrac 2.0.5 on an older PC (Intel i3@3.1Ghz, 8 GB, Intel onboard graphics) under Debian Testing.

The game runs perfectly fine, but occasionally when I'm finishing a lap, it hangs for half a second or so. I have not yet identified the exact circumstances (too busy racing ;)), but it happens regularly. It's not related to setting a new lap record (just checked), that was my initial suspicion.

[Wuzzy2]

I can confirm this.

[juzzlin]

On my rather powerful machine I'm seeing some weird general stuttering when playing in the windowed mode, but not in the full screen mode.

[Wuzzy2]

Strangely, I also have a stutter when I get a new lap record. But it's shorter. Maybe the long stutter happens at the end of a race when multiple achievements are gotten at once: Race record, new best rank, new track unlock, etc.

Random guess: Maybe it's the writing of files that takes so long?

[juzzlin]

It's possible that it's doing something stupid with QSettings. Of course using QSettings to store lap records is stupid in the first place. IIRC there's an issue to move these to an SQLite database.

[Wuzzy2]

Interesting: When the Game.conf file is rather large (many records/completed races are recorded), the stutter is longer than when I have a completely empty one. In a fresh install, the stutter is non-existant.

Maybe do you try to open and close the same file over and over again? :)

[Korodny]

I didn't look at it too closely the last few days, but so far I can't see a clear pattern. Sometimes it does hang when reporting a new lap record, sometimes it doesn't (I'm running in Fullscreen, btw.).

Maybe it's a cache related issue? I.e. opening the relevant file for the first time or writing it causes a problem? Read the data into a buffer before the race, don't write the buffer back until after the race?

[juzzlin]

Could you test if this helps: d28c2f1ea99c3d7c112878e6a252e3467b226ada

[Korodny]

Compiled and ran this new version - I take it it's intended that this new build ignores all of my achievements from the previous one?

I raced a handful of courses with heavy difficulty 1-5 times each. Didn't notice any stuttering when finishing a lap during the race, but every time I finished the race there was a short delay when crossing the finishing line. It was very short, sometimes barely noticable - but it was there every time.

Also: I don't think I got any "new lap record!" notifications during the race - I'm pretty sure a new lap record used to be announced below the lap time when finishing the lap?

[Wuzzy2]

FYI: The whole game is rather slow on most menu transitions (when I select PLAY, number of laps, difficulty level). I have a rather large Game.conf, too. Maybe you want to try testing with my file. When I remove the Game.conf, everything is fast again, but then I lose all my progress!

[BestPositionsV2]
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[Config]
IA_DOWN_0=39
IA_DOWN_1=116
IA_LEFT_0=38
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IA_RIGHT_1=114
IA_UP_0=25
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difficulty=0
fps=60
fullScreen=true
hRes=1920
lapCount=1
sounds=1
vRes=1080
vsync=1

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VHJpYW5nbGVfMV8y=true
VHJpYW5nbGVfMjBfMg%3D%3D=true
VHJpYW5nbGVfNTBfMg%3D%3D=true
VHJpYW5nbGVfNV8w=true
VHJpYW5nbGVfNV8x=true
VHJpYW5nbGVfNV8y=true
VHdpbmVidXJnXzEwXzI%3D=true
VHdpbmVidXJnXzFfMA%3D%3D=true
VHdpbmVidXJnXzFfMQ%3D%3D=true
VHdpbmVidXJnXzFfMg%3D%3D=true
VHdpbmVidXJnXzIwXzI%3D=true
VHdpbmVidXJnXzNfMA%3D%3D=true
VHdpbmVidXJnXzNfMQ%3D%3D=true
VHdpbmVidXJnXzNfMg%3D%3D=true
VHdpbmVidXJnXzUwXzI%3D=true
VHdpbmVidXJnXzVfMQ%3D%3D=true
VHdpbmVidXJnXzVfMg%3D%3D=true
VHdpc3Rlcl81MF8y=true
VHdpc3Rlcl81XzA%3D=true
VHdpc3Rlcl81XzE%3D=true
VHdpc3Rlcl81XzI%3D=true
VHdpc3Rlcl8xMF8y=true
VHdpc3Rlcl8xXzA%3D=true
VHdpc3Rlcl8xXzE%3D=true
VHdpc3Rlcl8xXzI%3D=true
VHdpc3Rlcl8yMF8y=true
VHdpc3Rlcl8zXzA%3D=true
VHdpc3Rlcl8zXzE%3D=true
VHdpc3Rlcl8zXzI%3D=true
eGRfM18y=true

(Note: I have manually converted the stuff to v2).

[juzzlin]

@Korodny Are you sure the times were lap records? It's showing the lap time anyway even if it was not a record. Now that I tested the message is working for me.

[juzzlin]

@Wuzzy2 Confirmed.

[juzzlin]

I replaced the slow QSettings with SQLite in f7edcad36e746de79ab6409a76e9f11c8c5aabc0. The only drawback is that all previous data will be erased. I still think this is a much better solution to store record times.

I'm closing this for now, but please reopen if the problem persists.