Slowdown on extended play time

[SegaLover2020]

Will you manage to try on Linux (and/or macOS?) I was wondering, could be somewhat related to some internal obscure "bug" deep inside Supermodel code?

Sadly I can't

[cglev]

This probably isnt related to your issue but as someone mentioned Sega Rally i thought id comment, Ive seen the drops on low end Linux hardware. My main ubuntu test machine seems to run ok though.

While i was testing you can see the drops happen in Sega Rally and its repeatable. The RAM and CPU usage is fine with some to spare and the Temp sits around the low 40s so its not throttling, but the fps can drop by around 5fps per lap. It happens in the same spot each time with the frame drop sustained until finish so overall it can drop around 10fps by the end of the third lap.

On Sega Rally the first lap is fine but about 1 second to the next lap, just as the second timer kicks in at the Checkpoint, thats where it drops frames and again on the third lap in the same place. Ive only noticed it in Practice mode, but i guess in Championship mode it resets to the next level instead of keeping track of the previous laps.

Sorry if this wasnt too helpful, but maybe it will pinpoint an area to look at.

[Bart]

I'm trying to narrow down the problem, so far the game that suffers the most is virtua striker 2. Doesn't matter which version or graphics setting, after about half a hour it stutters or slows down (depending of vsync or not). This is happening on the latest SVN as of 27 september 2020.

Do I need to run it unthrottled? Unthrottled, my frame rates are on the order of 170fps. It would take a considerable performance impact to notice any degradation if the frame rate is throttled to 60Hz.

Also: can you try it with the legacy engine?

EDIT: I've just let Virtua Striker 2 '99 sit for 2 hours and I see no difference. Memory usage did increase from 360 MB to about 400 MB over that time period.

[zuppa_di_pesce]

This probably isnt related to your issue but as someone mentioned Sega Rally i thought id comment, Ive seen the drops on low end Linux hardware. My main ubuntu test machine seems to run ok though.

While i was testing you can see the drops happen in Sega Rally and its repeatable. The RAM and CPU usage is fine with some to spare and the Temp sits around the low 40s so its not throttling, but the fps can drop by around 5fps per lap. It happens in the same spot each time with the frame drop sustained until finish so overall it can drop around 10fps by the end of the third lap.

On Sega Rally the first lap is fine but about 1 second to the next lap, just as the second timer kicks in at the Checkpoint, thats where it drops frames and again on the third lap in the same place. Ive only noticed it in Practice mode, but i guess in Championship mode it resets to the next level instead of keeping track of the previous laps.

Sorry if this wasnt too helpful, but maybe it will pinpoint an area to look at.

Yup, can confirm same behaviour on low-end machine just like you in Sega Rally in Win10. Instead, on my main computer I have no problems with Linux and Windows.

[SegaLover2020]

Also: can you try it with the legacy engine?

That worked, thanks for the suggestion. No more slowdowns, even if the game looks more "flat" or maybe I'm seeing things...Btw I thought the new engine was better for all games, but I guess it's not

[Bart]

Also: can you try it with the legacy engine?

That worked, thanks for the suggestion. No more slowdowns, even if the game looks more "flat" or maybe I'm seeing things...Btw I thought the new engine was better for all games, but I guess it's not

The new engine is indeed far more accurate. But this indicates there may be a leak in the new engine that occurs on certain systems. I'll have to ask Ian or take a look sometime. I wonder if it is something to do with the texture map allocation.