I did a hack to allow a single config file to work across all of my
hosts, even though I needed mod_multicpu and had different numbers of
processors on different machines.
The hack I did was as follows:
When gmond found a metric name which contained one or more (#) pound
signs, I converted the metric name to a sprintf string, as follows:
cpu_###_idle => cpu_%03d_idle
cpu_#_idle => cpu_%d_idle.
I then iteratively applied the config in question, stopping the first
time I got an error.
This would, of course, work only when the variants were numbered, zero
based, and consecutive, but it is very useful to me.
What I added to gmond.c was:
> +const char *make_fmt(const char * const src_in) {
> + char *pos=strchr(src_in,'#');
> + if(!pos)
> + return 0;
> +
> + {
> + const char *src = src_in;
> + static char fmt[1024];
> + static char * const end = fmt+sizeof(fmt)-1;
> + char *dst=fmt;
> + while(src!=pos && dst!=end) {
> + if((*dst++ = *src++)=='%' && dst!=end)
> + *dst++='%';
> + }
> + if(dst!=end)
> + *dst++='%';
> + if(dst!=end)
> + *dst++='0';
> + {
> + int pad=1;
> + while(*++src == '#')
> + ++pad;
> + dst+=snprintf(dst,end-dst,"%d",pad);
> + }
> + if(dst!=end)
> + *dst++='d';
> + while(dst!=end) {
> + switch(*dst++ = *src++) {
> + case 0:
> + return fmt;
> + case '#':
> + err_quit(">1 series of '#' in \"%s\"",src_in);
> + case '%':
> + if(dst!=end)
> + *dst++='%';
> + break;
> + default:
> + break;
> + }
> + }
> + err_quit("fmt string for \"%s\" too long",src_in);
> + }
> + /* not reached */
> + return 0;
> +}
> +double add_metric_series(
> + Ganglia_collection_group *group,
> + const char *name,
> + const char *title,
> + float value_threshold
> +)
> +{
> + const char *fmt=make_fmt(name);
> + if(!fmt)
> + return add_metric(group,name,title,value_threshold);
> + {
> + char dname[strlen(fmt)+16];
> + size_t idx;
> + double res=0.0;
> + for(idx=0;idx<64;idx++) {
> + snprintf(dname,sizeof(dname),fmt,idx);
> + // the first time through, we do not precheck the metric, so that
> + // if a series does not yield ANY valid metrics, we get an error.
> + if(idx && !apr_hash_get( metric_callbacks, dname, APR_HASH_KEY_STRING
> ))
> + break;
> + res+=add_metric(group,dname,title,value_threshold);
> + }
> + return res;
> + }
> +}
and I changed the call to add_metric to call add_metric_series instead.
Sorry for no more reasonable patch, but I made other changes, so can't
do a CVS diff.
This might, however, be useful to somebody else, so I thought I'd pass
the idea around.
Regards,
Rich
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