How can I be sure that a process does not go to sleep?

regressist said:

I had already put very high and was around 34%, like now

That percentage of use is consistent with a single-threaded program running on a CPU which has 4 cores and 8 threads.
(I just now verified this by writing a trivial Fortran program which increments a variable and types out its value periodically on my laptop which has an I7 CPU with 4 cores and 8 threads. I used gfortran under Cygwin.)

How many cores are in your CPU? How many logical processors does it have?
This information is available on TaskManager's CPU usage page.

Is the program that you're running multi-threaded or single-threaded?

If you're running a program which is not intentionally written to use more than one logical processor (i.e. if it is not explicitly written to be multi-threaded), then it will only be able to use a single logical processor. As a result, if your computer has more than one logical processor, such a single-threaded program only be able to use a small percentage of the total CPU cycles available.

I believe that TaskManager reports more than 12% (which would correspond to one logical processor out of 8 being fully saturated by a single thread) in my case is because the Fortran I/O system is itself multi-threaded, initiating the program's terminal I/O and returning to the main program before that I/O has completed.

selden said:

That percentage of use is consistent with a single-threaded program running on a CPU which has 4 cores and 8 threads.
(I just now verified this by writing a trivial Fortran program which increments a variable and types out its value periodically on my laptop which has an I7 CPU with 4 cores and 8 threads. I used gfortran under Cygwin.)

How many cores are in your CPU? How many logical processors does it have?
This information is available on TaskManager's CPU usage page.

Hi and thanks for the reply, there are 2 cores and 4 logical processors. The specification of the computer are

Processor Intel Core i3-11xxx Name Processor 1115G4 3.0 GHz (6M Cache, up to 4.1 GHz, 2 cores), speed in GHz 4,1

The program is for sure single threaded, I wrote it in old fashioned Pascal

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Try3 said:

Windows 10 includes a screensaver called "Blank" and that's what I selected.

If you cannot find the screensaver dialog through the menu system, you can just run this command.

Code:

C:\Windows\System32\rundll32.exe shell32.dll,Control_RunDLL desk.cpl,,1

Denis

Thanks it's useful since the blank is not available in the menu

regressist said:

Thanks Denis, I thought there was a possibility to wakelock the process, but this should be ok anyway.

Well, lots of applications do power requests to prevent the computer from going to sleep while they're running (and I get to do a lot of POWERCFG /REQUESTSOVERRIDE). So if you're a good programmer, you can make your program do the same thing.

Try calling the Windows function SetThreadExecutionState.

https://docs.microsoft.com/en-us/win...executionstate

Try3 said:

That is not the problem the OP has.
The OP's computer does not have Sleep. It has S0 Modern standby which uses different mechanisms to achieve its ends.

Denis

Thanks for your support Denis. I confirm that now with just Never Suspend setting the pc works always, no need of a black screensaver.

In view of the hw of this pc ((Processor Intel Core i3-11xxx Name Processor 1115G4 3.0 GHz (6M Cache, up to 4.1 GHz, 2 cores), speed in GHz 4,1)), do you think I could launch one more dos window (or maybe even two) and run other instances of the same program without slowing the first one (but maybe burnig the processor, now the fan is going extremely low and silent) ?