Migrate legacy C++ software to multicore environment

Multicore processors are now widely used in servers, laptops, tablets, eBooks, or even newer smartphones, always ubiquitous.

One of our software modules is also going to move to a multicore platform together with other modules.

Plan to have this migration done in 3 phases:

1. With least efforts, force the software to run on one of the CPU cores (as a workaround) to ensure stability, without blocking the migration progress of related modules.
2. Try with multicore mode to find out problems & fix, and optimize the code to take advantage of the multicore environment. Much effort will be spent on code inspection, analysis and optimization. May also look for off-the-shell solutions to expedite the migration.
3. Formally deploy tested software on multicore platform.

Phase 1

Linux supports locking a process to run on a single CPU core using process affinity.

The change is simple. It’ll be like (error checking is omitted for simplicity):

cpu_set_t mask;CPU_ZERO(&mask);      // clear the "CPU set" represented by the affinity maskCPU_SET(0, &mask);    // add the first available CPU, zero-basedsched_setaffinity(0, sizeof(mask), &mask);    // sets the CPU affinity mask of the calling thread

Reference: http://linux.die.net/man/2/sched_getaffinity

My blog: http://www.cnblogs.com/fanghm
原文链接: https://www.cnblogs.com/fanghm/archive/2012/10/12/2721269.html

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