code specific rrdidx question

[Jeff Newman]

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@=@RRDFN@:cpu at RRDIDX@pcntusr:AVERAGE
        DEF:sys at RRDIDX@=@RRDFN@:cpu at RRDIDX@pcntsys:AVERAGE
        DEF:wio at RRDIDX@=@RRDFN@:cpu at RRDIDX@pcntwio:AVERAGE
        DEF:idl at RRDIDX@=@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