Multithreading / multiprocess

[tleeuwenburg]

Is there anyway to begin a thread and execute a finite number of lines
of code, or a finite amount of time within it?

For example, say I create three child threads and I want to guarantee
equal timeshare between them, can I specify a quanta (say 400 LOC
although I know that is pretty small) to execute in each one in turn?

-T

 

[Diez B. Roggisch]

Is there anyway to begin a thread and execute a finite number of lines
of code, or a finite amount of time within it?

For example, say I create three child threads and I want to guarantee
equal timeshare between them, can I specify a quanta (say 400 LOC
although I know that is pretty small) to execute in each one in turn?

Not as such, no. You can play tricks with the trace-module, but these
ultimately fail when the code in question runs inside C - which puts a
stop to any python interpreter scheduling anyway, thus native threads
are used which can't be controlled on that level.


Diez

 

[Aahz]

Is there anyway to begin a thread and execute a finite number of lines
of code, or a finite amount of time within it?

For example, say I create three child threads and I want to guarantee
equal timeshare between them, can I specify a quanta (say 400 LOC
although I know that is pretty small) to execute in each one in turn?

You have extremely coarse-grained control with sys.setcheckinterval().
However, there is no guarantee which thread will pick up control after
each context switch, so one thread might get more than its share.

 

[TennesseeLeeuwenburg]

Not as such, no. You can play tricks with the trace-module, but these
ultimately fail when the code in question runs inside C - which puts a
stop to any python interpreter scheduling anyway, thus native threads
are used which can't be controlled on that level.

Diez

Mmmm good point. 1 line of Python != 1 line of C. That's probably not
very important for what I have in mind, but I hadn't really been
considering that angle.

Cheers,
-T

 

[TennesseeLeeuwenburg]

You have extremely coarse-grained control with sys.setcheckinterval().
However, there is no guarantee which thread will pick up control after
each context switch, so one thread might get more than its share.

Thanks for your reply! Will add that to my reading list.

Cheers,
-T