If you do want to do fast polling on the Linux or cygwin gmond, I found
some hardwired code in there which effectively limits the polling rate
for
some metrics no matter what you put in the config files. (Sorry martin,
have not raised a bug report yet). Anyway:
> the code below is in the cygwin and linux metric.c files.
>
> --------------------------------------------------------
> typedef struct {
> uint32_t last_read;
> uint32_t thresh;
> char *name;
> char buffer[BUFFSIZE];
> } timely_file;
>
> timely_file proc_stat = { 0, 15, "/proc/stat" };
> timely_file proc_loadavg = { 0, 15, "/proc/loadavg" }; timely_file
> proc_meminfo = { 0, 30, "/proc/meminfo" }; timely_file proc_net_dev =
> { 0, 30, "/proc/net/dev" };
>
> char *update_file(timely_file *tf)
> {
> int now,rval;
> now = time(0);
> if(now - tf->last_read > tf->thresh) {
> rval = slurpfile(tf->name, tf->buffer, BUFFSIZE);
> if(rval == SYNAPSE_FAILURE) {
> err_msg("update_file() got an error from slurpfile() reading
> %s",
> tf->name);
> return (char *)SYNAPSE_FAILURE;
> }
> else tf->last_read = now;
> }
> return tf->buffer;
> }
> --------------------------------------------------------
I have set those timeout values zero, which works well and gives
me nice spiky furry graphs.
- richard
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