Commit 63cde070 authored by Jonas Termansen's avatar Jonas Termansen

Added a benchmark for counting context-switches per second.

parent b0859c6d
......@@ -5,6 +5,7 @@ include ../crosscompilemakefile.mak
INITRDDIR:=../initrd
LOCALBINARIES:=\
benchsyscall \
benchctxswitch \
BINARIES:=$(addprefix $(INITRDDIR)/,$(LOCALBINARIES))
......
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
int main(int argc, char* argv[])
{
pid_t slavepid = fork();
if ( slavepid < 0 ) { perror("fork"); return 1; }
if ( slavepid == 0 ) { while ( true ) { usleep(0); } exit(0); }
uintmax_t start;
if ( uptime(&start) ) { perror("uptime"); return 1; }
uintmax_t end = start + 1ULL * 1000ULL; // 1 second
size_t count = 0;
uintmax_t now;
while ( !uptime(&now) && now < end ) { usleep(0); count += 2; /* back and forth */ }
printf("Made %zu context switches in 1 second\n", count);
kill(slavepid, SIGKILL);
return 0;
}
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