questions regarding GPA behavior on 3DVision systems

questions regarding GPA behavior on 3DVision systems

Imagen de s33m3

Hello, Believe me, or not but I got something really special :- Our game is running FASTER when started from intel GPA !!A simple sample is the time needed for a specific function, in average its 5 time faster when running trhough GPA analyser. I did some test, and this time is not taken from the DX Draw call, but from "pure C#" code !
It's like if GPA was making the code running faster ... really strange.

Do you have an idea, is GPA monitor starting the application with special parameters ?

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Imagen de Neal P (Intel)

Hello,

Glad to hear that you believe we've made your code run faster without any changes, but this is not an expected result of using the Intel GPA tools. Possibly something else is going on that needs some additional analysis.

Therefore, can you provide more information on the test methods you used for determining that Intel GPA makes your code run faster?

Regards,

Neal

Imagen de s33m3

In fact, I'm wondering of one thing. Have a 3DVision card (with stereosopic 120hz screen). The game I'm working on, is working perfectly in "2D" mode (aka 120hz in full screen). But as soon as I go in 3D mode (screen still at 120 - but ingame frame rate is 60hz - thus 1 frame by eye) I got "strange" stuttering. When moving its not "smooth", like if everything was going little bit forward and backward quicky, kind of flicker (That is not happening at all in 2D). But (and thats the reason of this message) when I want to debug the 3DVision mode with GPA, I have a problem : There are no more flickering/stuttering !! So I wa swandering, what could be the effect of GPA on this magical thing ! What is GPA doing that make the game run perfectly in 3D ! :D I know, it seems "magic", and I don't like it. Fabian.

Imagen de Neal P (Intel)

Hello,

First of all, please right-click on the Intel GPA Monitor in the notification tray, select "About...", and copy that information here. This will give us some more details about your specific configuration.

Some additional suggestions that end up solving many issues:

  • Be sure you have the latest BIOS for your system
  • Be sure you have the latest graphics driver for your system

Assuming that you have the latest BIOS and drivers, I would also check bulletin boards for your specific system to see if others have noticed the issue you're reporting with other games/apps -- that is, "flicker" when running in 3D mode.

Also, note whether other games on your system exhibit the issue that you are seeing -- if it's only your game I suspect an issue in your game's coding, but not being familiar with what you are doing I can't make any specific suggestions. If it's all 3d games/apps then it's likely something with your configuration (drivers, BIOS, hardware, etc.) that's causing the issue.

So realize that when Intel GPA runs, it "attaches" a DLL to your process so that it can trap various calls that you are making. Intel GPA then inserts calls to the driver (and other system calls) in order to gather statistics and display them as an overlay on top of your game. So the system/driver calls that we make may indirectly impact the synchronization of your game with the device. Normally there is no noticeable difference in the game (other than a slight reduction in the FPS due to the small overhead), but obviously something else is happening here, which makes me suspect one of the issues mentioned earlier in this reply.

Hope this helps.

Regards,

Neal

Imagen de Neal P (Intel)

Hello,

A couple more things...

First, I never got an answer back from you on my initial request for info on your performance measurement techniques. Please let me know what you are using to measure your performance versus Intel GPA's -- if it's FPS, how did you measure this both with and without Intel GPA running?

Secondly, are you using "automatic" or "explicit" mode to control the 3D buffers? Swap modes to see if you still get the same flicker effect. And are you using quad-buffered mode, and if so check your code for errors as well.

Lastly, can we get a copy of the code that exhibits this issue? This might help us understand the interaction with Intel GPA (especially if you claim a speedup in performance).

Thanks!

Neal

Imagen de Neal P (Intel)

(NOTE to others: I've been having some private discussions with the developer who started this thread, so some of this message may seem to be "out of context")

Hello,

As you've indicated that you've found the issue as to why you thought
that Intel GPA was causing your game code to run faster (you believe
that this is an internal issue with your code that you've since
resolved).

As to why Intel GPA seems to "fix" your synchronization issues, a quick
poll of the development team didn't come up with any specific
suggestions for how to fix your problem. Also, we don't have a 3DVision
system in-house to be able to help look at this specific problem.

Therefore, at this time your best bet is to try the 3DVision developer
forums -- maybe someone else doing similar development can help resolve
your synchronization issue.

Regards,

Neal

ps -> As I mentioned before, Intel GPA will make calls to the driver
to obtain metrics data at least once per frame. It's unclear how the
interaction between the various components (graphics device, driver, OS,
and Intel GPA) fixes the syncronization problem when running with Intel
GPA.

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