Mixing and Matching Tasks

You can combine the data parallel and task parallel patterns. Continuing with the display/update example, suppose that you can parallelize the update operation, but not the display operation. Then you could execute the display operation in parallel with multiple tasks from the update operation. Consider this C/C++ code:

initialize(data);
while (!done) {
    old_data = data;
    ANNOTATE_SITE_BEGIN(sitename);
    ANNOTATE_TASK_BEGIN(task_display);
    display_on_screen(old_data);
    ANNOTATE_TASK_END();
    update(data);
    ANNOTATE_SITE_END();
}
display_on_screen(data)
{
    . . .
}
update(data)
{
    for (each block of data) {
        ANNOTATE_TASK_BEGIN(task_update);
        update the block of data;
        ANNOTATE_TASK_END();
    }
}
For more complete information about compiler optimizations, see our Optimization Notice.