On Thu, 2011-06-16 at 09:19 -0600, David Ahern wrote:
>
> On 06/16/2011 09:08 AM, Peter Zijlstra wrote:
> > On Thu, 2011-06-16 at 08:08 -0600, David Ahern wrote:
> >> Command:
> >> perf stat -e instructions openssl speed aes
> >>
> >> Guest:
> >> 135,522,189,056 instructions # 0.00 insns per cycle
> >>
> >>
> >> Host:
> >> 346,082,922,185 instructions # 0.00 insns per cycle
> >
> > How does: perf stat -e instructions:u openssl speed aes, compare?
>
> In the past couple of months I recall you posted a one billion
> instruction benchmark in analyzing perf correctness. I can't seem to
> find that email. Do you recall the benchmark and if so can you resend ?
Sure, I've got a couple of those things lying around:
# perf stat -e instructions:u ./loop_1b_instructions-4x
Performance counter stats for './loop_1b_instructions-4x':
4,000,085,344 instructions:u # 0.00 insns per cycle
0.311861278 seconds time elapsed
---
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
main ()
{
int i;
fork();
fork();
for (i = 0; i < 100000000; i++) {
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
asm("nop");
}
wait(NULL);
wait(NULL);
wait(NULL);
wait(NULL);
}
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