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/* Stress test for Xen Store: multiple people hammering transactions */
#include "xs.h"
#include "utils.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#define NUM_HANDLES 2
#define DIR_FANOUT 3
#define DIR_DEPTH 3
/* How often to print progress */
static int print;
/* Layout looks like /<num>/<num>/count. */
static void work(unsigned int cycles, unsigned int childnum)
{
unsigned int i;
struct xs_handle *handles[NUM_HANDLES];
char id;
if (childnum < 10)
id = '0' + childnum;
else
id = 'A' + childnum - 10;
for (i = 0; i < NUM_HANDLES; i++) {
handles[i] = xs_daemon_open();
if (!handles[i])
barf_perror("Opening handle %i", i);
}
srandom(childnum);
for (i = 0; i < cycles; i++) {
unsigned int lockdepth, j, len;
char file[100] = "", lockdir[100];
char *contents, tmp[100];
struct xs_handle *h = handles[random() % NUM_HANDLES];
lockdepth = random() % DIR_DEPTH;
for (j = 0; j < DIR_DEPTH; j++) {
if (j == lockdepth)
strcpy(lockdir, file);
sprintf(file + strlen(file), "/%li",
random()%DIR_FANOUT);
}
if (streq(lockdir, ""))
strcpy(lockdir, "/");
if (!xs_transaction_start(h, lockdir))
barf_perror("%i: starting transaction %i on %s",
childnum, i, lockdir);
sprintf(file + strlen(file), "/count");
contents = xs_read(h, file, &len);
if (!contents)
barf_perror("%i: can't read %s iter %i",
childnum, file, i);
sprintf(tmp, "%i", atoi(contents) + 1);
if (!xs_write(h, file, tmp, strlen(tmp)+1, 0))
barf_perror("%i: can't write %s iter %i",
childnum, file, i);
/* Abandon 1 in 10 */
if (random() % 10 == 0) {
if (!xs_transaction_end(h, true))
barf_perror("%i: can't abort transact %s",
childnum, lockdir);
i--;
} else {
if (!xs_transaction_end(h, false))
barf_perror("%i: can't commit transact %s",
childnum, lockdir);
/* Offset when we print . so kids don't all
* print at once. */
if ((i + print/(childnum+1)) % print == 0)
write(STDOUT_FILENO, &id, 1);
}
}
}
static void create_dirs(struct xs_handle *h, const char *base, int togo)
{
unsigned int i;
char filename[100];
if (togo == 0) {
sprintf(filename, "%s/count", base);
if (!xs_write(h, filename, "0", 2, O_EXCL|O_CREAT))
barf_perror("Writing to %s", filename);
return;
}
for (i = 0; i < DIR_FANOUT; i++) {
sprintf(filename, "%s/%i", base, i);
if (!xs_mkdir(h, filename))
barf_perror("xs_mkdir %s", filename);
create_dirs(h, filename, togo-1);
}
}
static unsigned int add_count(struct xs_handle *h, const char *base, int togo)
{
unsigned int i, count;
char filename[100];
if (togo == 0) {
char *answer;
unsigned int len;
sprintf(filename, "%s/count", base);
answer = xs_read(h, filename, &len);
if (!answer)
barf_perror("Reading %s", filename);
count = atoi(answer);
free(answer);
return count;
}
count = 0;
for (i = 0; i < DIR_FANOUT; i++) {
sprintf(filename, "%s/%i", base, i);
count += add_count(h, filename, togo-1);
}
return count;
}
static void setup(void)
{
struct xs_handle *h;
/* Do setup. */
h = xs_daemon_open();
if (!h)
barf_perror("Contacting daemon");
create_dirs(h, "", DIR_DEPTH);
xs_daemon_close(h);
}
static unsigned int tally_counts(void)
{
struct xs_handle *h;
unsigned int ret;
h = xs_daemon_open();
if (!h)
barf_perror("Contacting daemon");
ret = add_count(h, "", DIR_DEPTH);
xs_daemon_close(h);
return ret;
}
int main(int argc, char *argv[])
{
unsigned int i;
bool failed = false;
int kids[10];
if (argc != 2)
barf("Usage: xs_stress <iterations>");
printf("Setting up directories...\n");
setup();
print = atoi(argv[1]) / 76;
if (!print)
print = 1;
printf("Running %i children...\n", ARRAY_SIZE(kids));
for (i = 0; i < ARRAY_SIZE(kids); i++) {
kids[i] = fork();
if (kids[i] == -1)
barf_perror("fork");
if (kids[i] == 0) {
work(atoi(argv[1]) / ARRAY_SIZE(kids), i);
exit(0);
}
}
for (i = 0; i < ARRAY_SIZE(kids); i++) {
int status;
if (waitpid(kids[i], &status, 0) == -1)
barf_perror("waitpid");
if (!WIFEXITED(status))
barf("Kid %i died via signal %i\n",
i, WTERMSIG(status));
if (WEXITSTATUS(status) != 0) {
printf("Child %i exited %i\n", i, WEXITSTATUS(status));
failed = true;
}
}
if (failed)
exit(1);
printf("\nCounting results...\n");
i = tally_counts();
if (i != (unsigned)atoi(argv[1]))
barf("Total counts %i not %s", i, atoi(argv[1]));
printf("Success!\n");
exit(0);
}
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