How many threads do I use ?

the_learner · #1 (**permalink**) 07-16-2007

Hi,

I have a program that has two types of threads:

1) Reader threads
2) Worker Threads

Readers: Their only job is to read files. They just read data from the files and put them into a buffer. They are obviously I/O intensive.

Workers: These are CPU intensive. They do some computation on the data which has been put into these buffers.

How many threads:

1) Worker: I think this answer is obvious. The number of worker threads should be equal to the number of CPUs in the sytem.

2) Reader: What about these? How can I determine the capability of I/O system ?

Specifically, I want the user to be able to specify the number of Reader and Worker threads the would like the program to use.

QUESTION: What guidelines should the user follow or use to determing this number ? How can they determine the capabilities of the I/O subsystem?

(The program uses 1 reader and 4 worker threads by default)

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