Global interfaces
Global interfaces report metrics related to a set of components on a system (such as processors, disks, or memory).
The following are the global interfaces:
The common signature used by all of the global interfaces
is as follows:
The return value is -1 in case of errors. Otherwise, the number
of structures copied is returned. This is always 1.
| Item | Descriptor |
|---|---|
| perfstat_cpu_total | Retrieves global processor usage metrics |
| perfstat_memory_total | Retrieves global memory usage metrics |
| perfstat_disk_total | Retrieves global disk
usage metrics Note: This API does not return any data when started
from an application running inside WPAR.
|
| perfstat_netinterface_total | Retrieves global network
interfaces metrics Note: This API does not return any data when started
from an application running inside WPAR.
|
| perfstat_partition_config | Retrieves Operating System and partition related information |
| perfstat_partition_total | Retrieves global partition metrics |
| perfstat_tape_total | Retrieves global tape
usage metrics Note: This API does not return any data when started
from an application running inside WPAR.
|
int perfstat_subsystem_total(perfstat_id_t *name,
perfstat_subsystem_total_t *userbuff,
int sizeof_struct,
int desired_number);| Item | Descriptor |
|---|---|
| perfstat_id_t *name | Reserved for future use, must be NULL |
| perfstat_subsystem_total_t *userbuff | A pointer to a memory area with enough space for the returned structure |
| int sizeof_struct | Should be set to sizeof(perfstat_subsystem_t) |
| int desired_number | Reserved for future use, must be set to 0 or 1 |
The following sections provide examples of the type of data returned and code using each of the interfaces.
The following code shows an example of how perfstat_netinterface_total is
used:
#include <stdio.h>
#include <libperfstat.h>
int main(int argc, char* argv[]) {
perfstat_netinterface_total_t ninfo;
int rc;
rc = perfstat_netinterface_total(NULL, &ninfo, sizeof(perfstat_netinterface_total_t), 1);
if (rc != 1)
{
perror("perfstat_netinterface_total");
exit(-1);
}
perfstat_netinterface_total(NULL, &ninfo, sizeof(perfstat_netinterface_total_t), 1);
printf("Network interfaces statistics\n");
printf("-----------------------------\n");
printf("number of interfaces : %d\n", ninfo.number);
printf("\ninput statistics:\n");
printf("number of packets : %llu\n", ninfo.ipackets);
printf("number of errors : %llu\n", ninfo.ierrors);
printf("number of bytes : %llu\n", ninfo.ibytes);
printf("\noutput statistics:\n");
printf("number of packets : %llu\n", ninfo.opackets);
printf("number of bytes : %llu\n", ninfo.obytes);
printf("number of errors : %llu\n", ninfo.oerrors);
}Network interfaces statistics
-----------------------------
number of interfaces : 2
input statistics:
number of packets : 306688
number of errors : 0
number of bytes : 24852688
output statistics:
number of packets : 63005
number of bytes : 11518591
number of errors : 0