Never terminating cpu bound c program

as you开发者_高级运维 know there are two kind of process, i/o bound and cpu bound...

i need a cpu bound program that never terminates itself...

for example; is it like i wanted?

while(1){

    for(int i=0;i<1000; i++);

}

for(;;); should do it!

First of all, why do you want a never terminating CPU bound program?

And yes, that would work, but you don't really need the inner for-loop. The while-loop will run forever on its own (assuming the compiler doesn't optimize it away).

There aren't only two kinds of processes. Even if you consider what resource is bounding the performance, there are more than two. The classic other ones are bandwidth, memory, database connections -- any finite resource or blocking one can be a bottleneck.

But, yes, your process is CPU-bound -- you can see that by looking at your task manager (Windows) or Activity Monitor (Mac) or top (Linux) and seeing it take 100% of your CPU.

Those programs probably aren't CPU bound.

I suggest implementing the Sieve of Eratosthenes, or something like that. How about a program that takes a number (say 42), divides it by Pi 1000 times, multiplies it by Pi 1000 times, subtracts the result from the original number, adds it to a variable and increments a counter. Then repeat that indefinitely. I suppose you might overflow one of the numeric values, but that should be fixable / preventable.