Creating tasks from native threads

[Thomas_W_Intel]

Hello,

We want to use the TBB task scheduler in conjuction with native threads, for a sub-problem in an application that is already threaded otherwise. In particular, we will have several native threads that create tasks. These tasks should be processed by a global task scheduler.

From reading the TBB documentation, it is unclear to me, if for optimal performance, there should be a init object in each of the native threads that create tasks, or if we should use a global init object.

Kind regards
Thomas

[elhefe38]

Hello

Quoting - Thomas Willhalm (Intel)

We want to use the TBB task scheduler in conjuction with native threads, for a sub-problem in an application that is already threaded otherwise. In particular, we will have several native threads that create tasks. These tasks should be processed by a global task scheduler.

From reading the TBB documentation, it is unclear to me, if for optimal performance, there should be a init object in each of the native threads that create tasks, or if we should use a global init object.

I recently ran into the same issue. You might want to have a look here
The short answer is that you need a task_scheduler_init object for each thread that uses tbb tasks (or "upper" classes such as parallel_for)
The good news is that the overhead introduced is very low (sub usecond on my test platform), provided you already created a task_scheduler_init at program start/dll load for instance.

regards