code specific rrdidx question

[Jeff Newman]

Sorry for the traffic, wanted to change this to say
that maybe it isn't just (or plain isn't) RRDIDX, but
maybe FNPATTERN as well. So add to my questions:

Does FNPATTERN have a problem distinguishing between
cpu1 and cpu10

-Jeff


On 3/22/06, Jeff Newman <jeffnewman75 at gmail.com> wrote:
> 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
>