dkhash_table *dkhash_create(unsigned int size)
{
double ratio;
unsigned int sz;
dkhash_table *t;
if (!size)
return NULL;
if(!(t = calloc(1, sizeof(*t))))
return NULL;
sz = rup2pof2(size);
ratio = (double)sz / (double)size;
if (ratio < 1.4)
sz = rup2pof2(sz + 1);
if (!(t->buckets = calloc(sz, sizeof(dkhash_bucket *)))) {
free(t);
return NULL;
}
t->num_buckets = sz;
return t;
}
/* displays service check scheduling information */
void display_scheduling_info(void)
{
float minimum_concurrent_checks = 0.0;
int suggestions = 0;
printf("Projected scheduling information for host and service checks\n");
printf("is listed below. This information assumes that you are going\n");
printf("to start running Nagios with your current config files.\n\n");
printf("HOST SCHEDULING INFORMATION\n");
printf("---------------------------\n");
printf("Total hosts: %d\n", scheduling_info.total_hosts);
printf("Total scheduled hosts: %d\n", scheduling_info.total_scheduled_hosts);
printf("Host inter-check delay: %.2f sec\n", scheduling_info.host_inter_check_delay);
printf("Max host check spread: %d min\n", scheduling_info.max_host_check_spread);
printf("First scheduled check: %s", (scheduling_info.total_scheduled_hosts == 0) ? "N/A\n" : ctime(&scheduling_info.first_host_check));
printf("Last scheduled check: %s", (scheduling_info.total_scheduled_hosts == 0) ? "N/A\n" : ctime(&scheduling_info.last_host_check));
printf("\n\n");
printf("SERVICE SCHEDULING INFORMATION\n");
printf("-------------------------------\n");
printf("Total services: %d\n", scheduling_info.total_services);
printf("Total scheduled services: %d\n", scheduling_info.total_scheduled_services);
printf("Service interleave factor: %d\n", scheduling_info.service_interleave_factor);
printf("Max service check spread: %d min\n", scheduling_info.max_service_check_spread);
printf("First scheduled check: %s", ctime(&scheduling_info.first_service_check));
printf("Last scheduled check: %s", ctime(&scheduling_info.last_service_check));
printf("\n\n");
/***** MINIMUM CONCURRENT CHECKS RECOMMENDATION *****/
minimum_concurrent_checks = ceil((((scheduling_info.total_scheduled_services / scheduling_info.average_service_check_interval)
+ (scheduling_info.total_scheduled_hosts / scheduling_info.average_host_check_interval))
* 1.4 * scheduling_info.average_service_execution_time));
printf("CHECK PROCESSING INFORMATION\n");
printf("----------------------------\n");
printf("Average check execution time: %.2fs%s",
scheduling_info.average_service_execution_time,
scheduling_info.average_service_execution_time == 2.0 ? " (pessimistic guesstimate)\n" : "\n");
printf("Estimated concurrent checks: %.0f (%.2f per cpu core)\n",
minimum_concurrent_checks, (float)minimum_concurrent_checks / (float)online_cpus());
printf("Max concurrent service checks: ");
if (max_parallel_service_checks == 0)
printf("Unlimited\n");
else
printf("%d\n", max_parallel_service_checks);
printf("\n\n");
printf("PERFORMANCE SUGGESTIONS\n");
printf("-----------------------\n");
/* compare with configured value */
if (((int)minimum_concurrent_checks > max_parallel_service_checks) && max_parallel_service_checks != 0) {
printf("* Value for 'max_concurrent_checks' option should be >= %d\n", (int)minimum_concurrent_checks);
suggestions++;
}
if (loadctl.nofile_limit * 0.4 < minimum_concurrent_checks) {
printf("* Increase the \"open files\" ulimit for user '%s'\n", naemon_user);
printf(" - You can do this by adding\n %s hard nofiles %d\n to /etc/security/limits.conf\n",
naemon_user, rup2pof2(minimum_concurrent_checks * 2));
suggestions++;
}
if (loadctl.nproc_limit * 0.75 < minimum_concurrent_checks) {
printf("* Increase the \"max user processes\" ulimit for user '%s'\n", naemon_user);
printf(" - You can do this by adding\n %s hard nproc %d\n to /etc/security/limits.conf\n",
naemon_user, rup2pof2(minimum_concurrent_checks));
suggestions++;
}
if (minimum_concurrent_checks > online_cpus() * 75) {
printf("* Aim for a max of 50 concurrent checks / cpu core (current: %.2f)\n",
(float)minimum_concurrent_checks / (float)online_cpus());
suggestions++;
}
if (suggestions) {
printf("\nNOTE: These are just guidelines and *not* hard numbers.\n\n");
printf("Ultimately, only testing will tell if your settings and hardware are\n");
printf("suitable for the types and number of checks you're planning to run.\n");
} else {
printf("I have no suggestions - things look okay.\n");
}
printf("\n");
return;
}
