Unix command for benchmarking code executing K times

Question

Suppose I have code running on Unix as follows:

$ ./mycode 

My question is whether there is a way in which I can run my code K times. For example, the value K = 1000.

I am aware of the Unix command "time", but it only executed 1 instance.

Answer 1

try

 $ time ( your commands ) 

write a loop to go to parens to repeat the command if necessary.

Update

Well, we can solve the command line task too long. This is the bash syntax, if you use a different shell, you may have to use expr (1).

 $ time ( > while ((n++ < 100)); do echo "n = $n"; done > ) real 0m0.001s user 0m0.000s sys 0m0.000s 

Answer 2

improve / clarify Charlie's answer:

 time (for i in $(seq 10000); do ./mycode; done) 

Answer 3

Just a tip: make sure that this “test” is close to your actual use of the executed program. If this is a short life process, significant overhead may arise, caused only by the creation of the process. Do not assume that this is the same as implementing this loop in your program.

Answer 4

To improve some of the other answers a little, some of them (those based on seq) can lead to a too strong command line if you decide to test, say, a million times. The following restrictions do not have

 time ( a=0 ; while test $a -lt 10000 ; do echo $a ; a=`expr $a + 1` ; done) 

Answer 5

Another solution to the “too long command line” problem is to use the C loop loop in bash:

  $ for ((i=0;i<10;i++)); do echo $i; done 

This also works in zsh (although I'm sure zsh has some more convenient way to use it, I'm just still new to zsh). I can’t test others because I have never used others.

Answer 6

If you are worried about the overhead of constantly loading and unloading the executable file into the process space, I suggest you configure the disk with the disk and the time from your application.

In the 70s, we used the opportunity to set a “sticky” bit in an executable file and leave it in memory. I don't know any unix that now supports this behavior, since it made updating apps a nightmare ....: o)