__itt_resume/__itt_pause does not work for "Performance Snapshot"

[heysweetethan]

Hi,

Does __itt_resume/__itt_pause work for "Performance Snapshot"?

It works for other analysis such as "Hotspots", "Threading" and etc.

The version of my VTune is 2022.2.0.

Thank you.

Ethan Kim

[ShyamS_Intel]

Thank you for posting in Intel Communities. 

itt_resume() and itt_pause() works fine with performance snapshot. It might not be visible in the results but there will be some difference in the elapsed time. We tried using itt_resume() and itt_pause() functions in a sample code and did performance snapshot analysis and we could observe some difference in the elapsed time.

If this resolves your issue, make sure to accept this as a solution. This would help others with similar issue. Thank you! 

Regards,

Shyam Sundar

[heysweetethan]

Thank you for your reply.

I'm still not sure that __itt_resume works for 'Performance Snapshot'.

Below is a sample source code that I made just for this.

I compiled it as 'VS2019 Console Application x64 Release' with all other configuration being default.

#include <iostream>
#include <thread>

#include "C:/Program Files (x86)/Intel/oneAPI/vtune/latest/include/ittnotify.h"
#pragma comment(lib, "C:/Program Files (x86)/Intel/oneAPI/vtune/latest/lib64/libittnotify.lib")

int main()
{
	double dSum = 0.0;

	__itt_resume();
	std::this_thread::sleep_for(std::chrono::seconds(5));
	for (int i = 0; i < INT_MAX; i++)
		dSum += 1.0;
	std::this_thread::sleep_for(std::chrono::seconds(5));
	__itt_pause();

	std::cout << dSum;
}

If I start 'Hotspots' by clicking 'Start Paused', 'Collection is paused' changes to 'Collecting Hotspots data'.

    =>   

If I start 'Performance Snapshot' by clicking 'Start Paused', 'Collection is paused' does not change to 'Collecting ... data'.

Can you take a look at this?

Thank you again.

Best Regards,

Ethan Kim

[ShyamS_Intel]

Hi,

We used the same code which you provided and it worked fine while performance snapshot.

If this resolves your issue, make sure to accept this as a solution. This would help others with similar issue. Thank you! 

Regards,

Shyam Sundar

[heysweetethan]

Thank you for your reply.

Just for sure, did you start analysis with "Start Paused"?

Very awkward situation happens to me.

If I run VTune as administrator, it seems that _itt_resume does NOT work. Please see below.

  

If I run VTune 'NOT' as administrator, __itt_resume does work. Please see below.

  

I will try with a whole new PC.

My current PC has an antivirus program and Symatec Data Loss Prevention solution installed. Can these disturb VTune?

Best Regards, 

Ethan Kim

[ShyamS_Intel]

Hi,

We are working on this internally.

Will let you know once we get an update.

Thanks

Shyam Sundar