Example
The pseudocode below illustrates task parallelism:
program: ... if CPU="a" then do task "A" else if CPU="b" then do task "B" end if ... end programThe goal of the program is to do some net total task ("A+B"). If we write the code as above and launch it on a 2-processor system, then the runtime environment will execute it as follows.
- In an SPMD system, both CPUs will execute the code.
- In a parallel environment, both will have access to the same data.
- The "if" clause differentiates between the CPU's. CPU "a" will read true on the "if" and CPU "b" will read true on the "else if", thus having their own task.
- Now, both CPU's execute separate code blocks simultaneously, performing different tasks simultaneously.
Code executed by CPU "a":
program: ... do task "A" ... end programCode executed by CPU "b":
program: ... do task "B" ... end programThis concept can now be generalized to any number of processors.
Read more about this topic: Task Parallelism
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