Scyld ClusterWare HPC: Reference Guide
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beostat_get_net_rate

Name

beostat_get_net_rate -- get the cumulative network interface on a node

Synopsis

#include <sys/beostat.h>

unsigned long beostat_get_net_rate (int node);

Arguments

node: The node to query

Description

beostat_get_net_rate will get the current network usage rate in bytes per second across all interfaces on that node.

Examples

 printf ("Node 3 is currently transferring %d bytes / second.\n", beostat_get_net_rate (3));

This function can give erroneous results for its transfer counts during the moment of rollover of each interface.

Return Value

Returns an unsigned long, which represents the network transfer rate. 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.

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