task scheduling

TBB initialization, termination, and resource management details, juicy and gory.

Well, maybe more essential than juicy, and rather treacherous than gory. As I noted in my previous blog introducing a major task scheduler extension – support for task and task group priorities, TBB has been steadily evolving ever since its inception.

TBB 3.0 and processor affinity

A week ago I started telling about a couple of new helpful features in the TBB 3.0 Update 4 task scheduler, and we talked about the support for processor groups – an extension of Win32 API available in 64-bit edition of Windows 7. The main purpose of processor groups is to extend Win32 capabilities to allow applications work with more than 64 logical CPUs.

TBB 3.0, high end many-cores, and Windows processor groups

Though I wrote my previous TBB task scheduler blog just a few days after TBB 3.0 Update 4 had been released, I ignored that remarkable event, and instead delved into more than two year old past. So today I’m going to redeem that slight, and talk about a couple of small but quite useful improvements in the TBB scheduler behavior made in the aforementioned update.

TBB 3.0 task scheduler improves composability of TBB based solutions. Part 2.

Master threads isolation described in the first part of the blog was not the only change in the TBB 3.0 scheduler ameliorating composability of the code parallelized with TBB. Another tightening in the scheduler guarantees improves a popular usage model described in the TBB Reference Manual as “Letting main thread work while child tasks run”. Here is a short example of what it looks like:

TBB 3.0 task scheduler improves composability of TBB based solutions. Part 1.

This is the first of two blogs where I’m going to describe some of the problems that users of TBB 2.2 and earlier came across, and the changes in task scheduler behavior made in TBB 3.0 release in order to solve them. In this part we’ll talk about issues caused by the lack of master threads isolation from each other inside TBB task scheduler. But first off, let me share with you a little of the background considerations.

Exception Handling and Cancellation in TBB - Part IV – Using context objects

After a good deal of theoretizing about various cancellation scenarios, we’ve finally reached the point where we can touch a bit more material substance (if one can say so about information☺). So let’s see how to use group contexts in practice.

Exception Handling and Cancellation in TBB - Part II – Basic use cases

After the long-winded introduction let’s consider the semantics of task cancellation and exception handling in TBB. The basic usage model of cancellation was shaped in order to cover the following primary use cases:

    1. Cancelling an algorithm when one of its tasks decides that the purpose of the algorithm has been reached. A variety of parallel search algorithms falls in this category for instance.

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