The following patch will allow fio to accept server IPs from a file. This is particularly useful when you have large numbers of fio servers (example: virtual machine guests) that participate in a test. To use this, simply use the --client option but instead of specifying a host name or IP, provide a pathname for a file containing a list of host names/addresses, one host per line.
--- init.c.sav 2015-02-08 05:39:33.507493776 -0500
+++ init.c 2015-02-08 06:00:14.479913391 -0500
@@ -2226,6 +2226,27 @@
exit_val = 1;
break;
}
+ if (0 == access(optarg, R_OK)) {
+ /* this is really a file containing a list of host addrs or names */
+ char hostaddr[257] = {0};
+ FILE * hostf = fopen(optarg, "r");
+ if (!hostf) {
+ log_err("fio: could not open client list file %s for read\n", optarg);
+ do_exit++;
+ exit_val = 1;
+ break;
+ }
+ while (fscanf(hostf, "%s", hostaddr) == 1) {
+ if (fio_client_add(&fio_client_ops, hostaddr, &cur_client)) {
+ log_err("fio: failed adding client %s from file %s\n", hostaddr, optarg);
+ do_exit++;
+ exit_val = 1;
+ break;
+ }
+ }
+ fclose(hostf);
+ break; /* no possibility of job file for "this client only" */
+ }
if (fio_client_add(&fio_client_ops, optarg, &cur_client)) {
log_err("fio: failed adding client %s\n", optarg);
do_exit++;
--
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