What is multithreading Success Criteria ?

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Hi i am currently writing a programme using multithreading. Multithreading is used to utilize CPU fully.
my current programme is running well but CPU utilization is around 40-50% for the entire running.

As per the multithreading theory it should be 100% for at lest some time.

Since even after doing multi threading the CPU utilization is 50% only, can it be treated as failed multithreading ??

I am using a single core processor without hyperthreading. The application do not allow human intervention. it has a function which calculates a lot. one gui thread + one worker thread.

Q.

Is it a rule that for a application in which multithreading is successfully implemented CPU utilization MUST be 100%.
anything less be treated as failed multithreading ??

For successful multithreading what should be the ideal CPU utilizaion on

1.single core and
2.multicore processors.

All cores should be used to 100% or what is the exact criteria to know if the multithreadig is successful.

Or asking in different way

1. while running my program if CPU utilization is below 100% is there any scope of improvement in terms of design of program and / or coding ??

100% need not be literal but very high say 90% or above as currently the utilization is about 50%.

Experts please comment.

Posted 11-Mar-11 17:27pm

ulka@NCST

Updated 11-Mar-11 19:03pm

v4

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2 solutions

Solution 1

You must be running a processor with mutliple processors (virtual). As a result, you will see a maximum utilization of only 50% on that processor.

Posted 11-Mar-11 17:37pm

Abhinav S

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Sergey Alexandrovich Kryukov 12-Mar-11 0:49am

Sorry, Abhinav, did you actually try to use 100% in multiple cores? I did. Easily! The problem is not so simple as 100% CPU, please see my Answer.
(I did not vote this time.)
--SA

Abhinav S 12-Mar-11 8:08am

Ok makes some sense.

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-03-11T18:47:00

Both criteria are nonsense. There are many reasons to use threading, but only for some tasks 100% of CPU usage is desired. Example of such task is long-lasting calculations without human intervention. There are many such tasks, such as numerical simulation of complex models. But! In all these cases the problem of 100% CPU utilization is not really a problem. If you run one such task, a single-CPU computer will be 100% busy anyway. The case of the system with multiple cores/CPUs the problem is more complex, but no reduced to the problem of 100% CPU usage. You can easily keep 100% CPU busy still having the effective throughput of your task unsatisfactory (even when no thread is doing anything stupid from its local standpoint, such as spin-wait). The real goal it to complete the given volume of calculation sooner, which is a very different problem, much more complex.

In this way, the problem of 100% CPU utilization is mostly artificial and is not much relevant to the really difficult problem of effectiveness of parallel calculation.

—SA

What is multithreading Success Criteria ?

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What is multithreading Success Criteria ?

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