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/* Start a lot of processes and let them finish to test if we
* eventually run out of process slots.
* To run the test effectively, if you have a limit on number of
* processes, lower the limit to 5 processes and run this test like
*
* 'longrun 5 400'
*
* It will fill (and if it works empty) your process table 400 times
* :-)
*
* Note that some pintos tests requires at least 16 simultaneous
* processes to work, so be sure to increase the limit before running
* pintos tests.
*/
#include <syscall.h>
#include <stdlib.h>
#include <stdio.h>
#define MAX_SIMULTANEOUS 50
#define MAX_REPEAT 1000
int main(int argc, char* argv[])
{
char cmd[15];
int pid[MAX_SIMULTANEOUS];
unsigned i = 0;
unsigned j = 0;
unsigned simul = 0;
unsigned repeat = 0;
if (argc != 3)
{
printf("Usage: %s simultaneous repeat\n"
"Where 'simultaneous' is the number of simultaneous processes to \n"
"start and wait for, and 'repeat' how many times this should be \n"
"repeated.\n", argv[0]
);
return -1;
}
simul = atoi(argv[1]);
repeat = atoi(argv[2]);
if (simul > MAX_SIMULTANEOUS)
{
printf("This test program is compiled with a limitation to max %d \n"
"simultaneos processes.\n", MAX_SIMULTANEOUS);
return -1;
}
if (repeat > MAX_REPEAT)
{
printf("This test program is compiled with a limitation to max %d \n"
"repetitions.\n", MAX_REPEAT);
return -1;
}
printf("Will try to start a total of %d processes in groups of %d\n",
simul * repeat, simul);
for (j = 0; j < repeat; ++j)
{
for (i = 0; i < simul; ++i)
{
snprintf(cmd, 15, "dummy %i", j * simul + i);
pid[i] = exec(cmd);
}
/* There will never be more than 'simul' processes running
* simultaneously, but in total there will be a lot of processes
* (repeat * simul). Just as you can expect in a real system.
*/
for (i = 0; i < simul; ++i)
{
/* probably nothing left to wait for */
if (pid[i] == -1)
{
printf("ERROR: Aborting test. Some execution(s) failed\n");
return j+1;
}
wait(pid[i]);
}
}
return 0;
}
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