change the niceness of a process

[clife]

Hi,

I need to change the nice value of a process, but not sure how to do it.
My process has a priority of 0 when it is launched , i need to decrease it to some +ve value.

I know we use

os.system("renice -n value -p pidof process").

to change, but not sure whether to change the value before launching the process or after launching the process.

Any help is very much appreciated.

Thanks,

[Gribouillis]

If you don't mind using a third party library, you may consider psutil where process objects have get_nice() and set_nice() methods.

[clife]

I am not that lucky..., i cannot use that , i mean its better if we can do it by existing standard calls

[Gribouillis]

I don't see how the process could have a pid before you launch it, so the answer is most certainly after launching the process. You could also start the program directly with the nice command.