Does WPF waits for GPU present to complete?

I'm testing how frequently WPF display can change when I have one window per monitor. My frame rate isn't amazing, and using xperf and GPUView it looks like WPF prepares both windows and then calls "Present packet" on both at the same time, and
waits for both to complete before moving on to send the next frames to the video card. I think my frame rate could have been faster if WPF didn't wait for the present to complete on both displays. When I run two WPF processes, each with one window on
one monitor, the present packets are independent, so parallel processing is more efficient and the frame rate is higher.
Did anyone observe the same behavior? Is there a flag I can set to make the WPF windows of one process more independent?

Hello Shir Oren,
I'm confused about those monitors, do you mean you have a computer with a few monitors?
Then "When I run two WPF processes" can you briefly introduce it here? Different applications on different monitor? Do you actually mean thread but not process here?
Actually WPF can take advantage of both Hardware and Software Rendering Pipeline, for details please refer to MSDN article:
https://msdn.microsoft.com/en-us/library/bb613578(v=vs.110).aspx
I'm not sure whether there is a flag you metioned but I haven't found it at this time. So I recommend you focus on the exist WPF render tiers from here
https://msdn.microsoft.com/en-us/library/ms742196(v=vs.110).aspx to consider raise your performance.
Best regards,
Barry
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Mac:
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Windows:
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[Solved] systemd does not wait for the unit to finish

My problem is described in the title. I have made a test by enabling the following unit:
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Last edited by olive (2015-03-16 16:49:34)

olive, now you're making even less sense. I didn't say the sleep example was stupid and I didn't question your reasons for doing/wanting this.
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graphical.target has these DefaultDependencies, so it is not started until all its units (like display-manager.service) and other After= dependencies (like multi-user.target) have finished starting. Your sleep service has to be started before multi-user.target starts (again due to default target dependencies). So first display-manager and the sleep service are started and after 1000 seconds, the sleep service finishes starting and then (assuming all other dependencies were quicker) multi-user.target is started and graphical.target as well (assuming display-manager didn't need 1000 seconds).
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olive wrote wrote:However, units that are parts of the graphical target are still launched before the graphical target become active. I am still unable to completely delay the starts of the graphical target before a specific unit completes.
It should be clear now how this works. "units that are part of the graphical target" can only mean "units that are wanted/required by the graphical target" but that is basically all the units that are started when you boot your system, because multi-user.target is a part of graphical.target. And your sleep service is a part of multi-user.target, so in fact you're saying you want to delay starting the sleep service until the sleep service completes
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Does WPF waits for GPU present to complete?

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