CODEWITHSUNDEEP
multithreadingcpumulticore
user225008
user225008

Reputation: 123

How does more than one thread execute on a processor core

I wanted to know how does a multi-threaded program with more number of threads executes on a processor core. For example, my program has 12 threads and I am running it on a intel core-i5 machine. It has four CPUs. Will each core run 3 threads? I am confused because I have seen programs with 30 threads running on a 4 core machine.

Thanks

Upvotes: 6

Views: 9821

Answers (2)

Shubhesh Swain
Shubhesh Swain

Reputation: 1

The processor core is capable of executing one thread at a time. In a quad core, 4 threads are executed simultaneously. Not all the user space threads are executed simultaneously, the kernel threads also runs to schedule the next thread or do some other kernel tasks.

Upvotes: 0

Steve
Steve

Reputation: 11963

Each core would be able to execute one thread simultaneously. So if there are 30 threads and 4 cores, 26 threads will be waiting to get context switched to get executed. Something like, thread 1-4 runs for 200ms and then 5-8 runs for 200 ms and so on

Upvotes: 9

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