rrdtool graph v1.2.24 on AIX 5.3 will hang ( Use ~ 90$ cpu )

[human]

Given,

rrdtool v1.2.24 build on AIX 5.3 with xlC v8

Running ganglia ( gmetad v3.0.5 ) for a while. First everything works fine using ganglia's web interface. But after a while the browser say: Loading ....... for a graph. Looking at the process list i see a rrdttol graph process running using 90% of the cpu and never ending.

For debugging i used the following commands. On my system the first & second command are running but if i INCREASE the value for run B from --end 1195053850 to --end 1195053851 even run B will fail where run C will fail everytime on the give rrd database.

Any hints ?

$ cat rrdtest

echo AAAAAAAAAAA
truss -efa /usr/bin/rrdtool graph - \
        --imgformat PNG         \
         --start 1194965906     \
         --end 1195052306       \
         --width 300 --height 75        \
         --title weight         \
        --color BACK#ffffff     \
        DEF:sum="weight.rrd":sum:AVERAGE \
        AREA:sum#0000ff:"tcseptimus last day (now -1.00)"

echo BBBBBB

truss -efa /usr/bin/rrdtool graph -    \
        --imgformat PNG         \
        --start 1195050792      \
        --end 1195053850        \
        --width 300 --height 75 \
        --title weight          \
        --color BACK#ffffff     \
        DEF:sum="weight.rrd":sum:AVERAGE        \
         AREA:sum#0000ff:"tcvulcanus last hour (now -1.00)"

echo CCCCCC
truss -efa /usr/bin/rrdtool graph -    \
        --imgformat PNG         \
        --start 1195050792      \
        --end 1195054392        \
        --width 300 --height 75 \
        --title weight          \
        --color BACK#ffffff     \
        DEF:sum="weight.rrd":sum:AVERAGE        \
         AREA:sum#0000ff:"tcvulcanus last hour (now -1.00)"

[human]

Trouble causing rrd database

[oetiker]

you may have more success asking about these things on the mailinglist ...

[human]

Replying to oetiker:

you may have more success asking about these things on the mailinglist ...

I just hoped that you test the given rrd database on your system to see i you have the same problem or not. The point is that the rrdtool graph v1.2.13 running against the test rrd database shows no problem. If it is working for you i can build a debug version ...

tia Hajo

[oetiker]

Thanks for reporting this ... the problem was that rrdtool was not handling the case correctly where min and max wer equal and both negative ... the patch is in r1233.