beostat_get_MHz¶

Name¶

beostat_get_MHz -- get the speed of the processor on a node

Synopsis¶

#include <sys/beostat.h>
int beostat_get_MHz (int node, float *MHz);

Arguments¶

node: The node to query
MHz: A pointer to a float, which will contain the speed of processor on the node in megahertz upon successful completion.

Description¶

beostat_get_MHz executes on the master node and returns the speed of CPU(s) on a given node in units of megahertz. On multi-CPU (SMP) machines it is assumed that all CPUs are the same speed. This is currently a hardware requirement on all known SMP machines.

Examples¶

float speed;
beostat_get_MHz (3, &speed);
printf ("The node 3 has a %f MHz processor\n", speed);

Return Value¶

Return 0 on success. If an error occurs, it will return -1.

Errors¶

This function relies on the Beostat subsystem, which consists of the proc filesystem on the remote node, the sendstats daemon on the remote node, the recvstats daemon on the master node, and two shared memory files in the directory /var/shm. If any part of the system breaks down, this function could fail.