code specific rrdidx question

["Jeff Newman" <jeffnewman75 (at) gmail.com>]

All,

I don't know C all that well, so I need some assistance.

what are the limits/constraints of RRDIDX for graphing?

I believe the answer is buried somewhere in hobbitgraph.c

Here is my test case:

I had:

sar,cpu0.rrd
sar,cpu1.rrd
sar,cpu2.rrd
sar,cpu3.rrd
...
sar,cpu10.rrd
sar,cpu11.rrd
...
sar,cpu15.rrd

hobbitgraph.cfg:

[sar]
        FNPATTERN sar,(.*).rrd
        TITLE CPU sar
        YAXIS %
        DEF:usr (at) RRDIDX@= (at) RRDFN@:cpu (at) RRDIDX@pcntusr:AVERAGE
        DEF:sys (at) RRDIDX@= (at) RRDFN@:cpu (at) RRDIDX@pcntsys:AVERAGE
        DEF:wio (at) RRDIDX@= (at) RRDFN@:cpu (at) RRDIDX@pcntwio:AVERAGE
        DEF:idl (at) RRDIDX@= (at) RRDFN@:cpu (at) RRDIDX@pcntidl:AVERAGE
        AREA:usr (at) RRDIDX@#0000FF:@RRDPARAM (at) pcntusr
        GPRINT:usr (at) RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:usr (at) RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:usr (at) RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:usr (at) RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        STACK:sys (at) RRDIDX@#FF0000:@RRDPARAM (at) pcntsys
        GPRINT:sys (at) RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:sys (at) RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:sys (at) RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:sys (at) RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        STACK:wio (at) RRDIDX@#800080:@RRDPARAM (at) pcntwio
        GPRINT:wio (at) RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:wio (at) RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:wio (at) RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:wio (at) RRDIDX@:AVERAGE: \: %5.1lf (avg)\n
        STACK:idl (at) RRDIDX@#008000:@RRDPARAM (at) pcntidl
        GPRINT:idl (at) RRDIDX@:LAST: \: %5.1lf (cur)
        GPRINT:idl (at) RRDIDX@:MAX: \: %5.1lf (max)
        GPRINT:idl (at) RRDIDX@:MIN: \: %5.1lf (min)
        GPRINT:idl (at) RRDIDX@:AVERAGE: \: %5.1lf (avg)\n


hobbitserver.cfg has sar::1 (to only draw 1 graph per cpu) for GRAPHS,
and just regular "sar" is in TEST2RRD

sar is in the "multitest" section of hobbitcgi.cfg, as well as listed
in the extra tests section of hobbitlaunch.cfg

On a host with 4 CPU's (0,1,2,3) it draws 4 graphs
On a host with 16 CPU's (0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15)
It would draw a graph for 0,1, and broken boxes for 2,3, and no others.

SO, I removed "10,11,12,13,14,15" and outputted them to a,b,c,d,e,f
respectively.

The graphs then drew 0,1,2,3 and no more.

If I click on a specific graph, and change the "first=" to 5, it will
draw a graph for CPU4, so somewhere, the first= line isn't getting
generated correctly.

So I guess 2 questions:

1 already stated (limitations of RRDIDX - does is get confused by 1 vs
10 for example)
The other is where the first= line gets updated and why isn't it
getting updated correctly?

Any insights would be much apprieciated, as this is driving me nuts.

Thanks,
Jeff