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As a fun exercise, what is the best way to maximize the unix CPU load average without actually consuming lots of resources (CPU cycles or memory)?
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As a fun exercise, what is the best way to maximize the unix CPU load average without actually consuming lots of resources (CPU cycles or memory)?
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This question is covered on Stackoverflow: Artificially modify server load in Ubuntu
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Last week I wanted to create a backup from my HDD. I mounted it to my old Linux machine and then ran the tar cvjf
command to create and compress my HDD. My system has a Celeron CPU which I think is older than 6 years. It's done after 48 hours and the CPU works 99%, but my memory didn't use very much, maybe 50 MB.
Now there are many solutions to your question. Another one is to calculate the factorial of one number (big number).
I've written a simple C program:
#include <stdio.h>
void main() {
for ( int i = 0; i < 10000000000000; i++);
}
Then I compiled it with the GCC
command, opened 5 terminals and executed them.
This image shows my load average, which is 5. Notice: My program depends on your CPU. I tested it with Pentium M.
What I meant was that I didn't want to perform computationally intensive tasks. These examples all peg the CPU. – Victor Liu – 2013-05-18T03:16:25.910
Can you please give me an example? – Sepahrad Salour – 2013-05-18T03:18:00.780
Well, I can't think of one that doesn't peg the CPU but increases the cpu load average. Hence the question. – Victor Liu – 2013-05-18T03:27:13.587
Please read my edited post. Hope this helps. – Sepahrad Salour – 2013-05-20T09:01:36.340
Via OS-specific mechanisms. – Ignacio Vazquez-Abrams – 2013-05-18T02:58:45.503
Let's suppose this is on modern day Linux. – Victor Liu – 2013-05-18T03:00:17.060
Why don't you patch the kernel so that it lies about the CPU load average? – Dan D. – 2013-05-18T03:37:56.103