nellemann/aix-disk-stats
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Mark Nellemann 2022-11-11 11:44:28 +01:00
parent 7eced67734
commit fe3e238ffb
2 changed files with 68 additions and 37 deletions
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5
Makefile
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@ -6,11 +6,8 @@ CFLAGS=
default: test
%.0: %.c
$(CC) -c -o $@ $< $(CFLAGS)
test: test.o
gcc -lperfstat -o test test.o
$(CC) -lperfstat -o test test.o
clean:
-rm -f test.o

94
test.c
View file

@ -11,11 +11,9 @@ Modified example from: https://www.ibm.com/docs/en/aix/7.3?topic=interfaces-perf
int main(int argc, char* argv[]) {
int i, ret, tot;
perfstat_disk_t *statp;
perfstat_id_t first;
while(1) {
int i, ret, tot;
perfstat_disk_t *statp;
perfstat_id_t first;
/* check how many perfstat_disk_t structures are available */
tot = perfstat_disk(NULL, NULL, sizeof(perfstat_disk_t), 0);
@ -30,34 +28,70 @@ int main(int argc, char* argv[]) {
exit(-1);
}
/* allocate enough memory for all the structures */
statp = calloc(tot, sizeof(perfstat_disk_t));
/* set name to first interface */
strcpy(first.name, FIRST_DISK);
long history[32][8];
/* ask to get all the structures available in one call */
/* return code is number of structures returned */
ret = perfstat_disk(&first, statp, sizeof(perfstat_disk_t), tot);
while(1) {
/* check for error */
if (ret <= 0) {
perror("perfstat_disk");
exit(-1);
/* allocate enough memory for all the structures */
statp = calloc(tot, sizeof(perfstat_disk_t));
/* set name to first interface */
strcpy(first.name, FIRST_DISK);
/* ask to get all the structures available in one call */
/* return code is number of structures returned */
ret = perfstat_disk(&first, statp, sizeof(perfstat_disk_t), tot);
/* check for error */
if (ret <= 0) {
perror("perfstat_disk");
exit(-1);
}
/* print statistics for each of the disks */
for (i = 0; i < ret; i++) {
unsigned long bsize = statp[i].bsize; // Disk block size (in bytes).
unsigned long rblks = statp[i].rblks; // Number of blocks read from disk.
unsigned long wblks = statp[i].wblks; // Number of blocks written to disk.
unsigned long rbytes = 0;
if(rblks > 0) {
rbytes = rblks * bsize;
}
unsigned long rdiff = 0;
if(history[i][0] > 0) {
rdiff = rbytes - history[i][0];
}
unsigned long wbytes = 0;
if(wblks > 0) {
wbytes = wblks * bsize;
}
unsigned long wdiff = 0;
if(history[i][1] > 0) {
wdiff = wbytes - history[i][1];
}
printf("%s => reads [ blocks: %10u, bytes %10u, diff %8u ], writes [ blocks: %10u, bytes: %10u, diff: %8u ]\n",
statp[i].name,
rblks,
rbytes,
rdiff,
wblks,
wbytes,
wdiff
);
history[i][0] = rbytes;
history[i][1] = wbytes;
}
sleep(10);
}
/* print statistics for each of the disks */
for (i = 0; i < ret; i++) {
printf("%s: %11u blocks of %11u bytes read, %11u blocks of %11u bytes written\n",
statp[i].name,
statp[i].rblks,
statp[i].bsize,
statp[i].wblks,
statp[i].bsize
);
}
sleep(10);
}
}