[rrd-users] Re: segmentation fault with graph command

[Kate Ericson]

Thanks for the reply.  I upgraded to 1.2.11 but am still getting a seg fault
error (it's finding my .rrd file and I've created graphs successfully with
similar .rrd file names).  I set up the archive to store ~52,000 rows and to
expect input every other day.  The dump dates
(http://tech.teragrid.org/inca/TG/html/rrd_dump) look a little strange
though:

<!-- 1990-02-05 04:56:32 PST / 634222592 --> <row><v> NaN </v></row>
...
<!-- 2005-08-31 05:56:32 PDT / 1125492992 --> <row><v> NaN </v></row>
<!-- 2005-09-02 05:56:32 PDT / 1125665792 --> <row><v> NaN </v></row>
...
<!-- 2038-01-18 04:56:32 PST / 2147432192 --> <row><v> NaN </v></row>
<!-- 1901-12-14 22:28:16 PST / -2147362304 --> <row><v> NaN </v></row>
...
<!-- 2005-08-30 23:28:16 PDT / 1125469696 --> <row><v> NaN </v></row>
<!-- 2005-09-01 23:28:16 PDT / 1125642496 --> <row><v> NaN </v></row>
<!-- 2005-09-03 23:28:16 PDT / 1125815296 --> <row><v> NaN </v></row>
...
<!-- 2038-01-17 22:28:16 PST / 2147408896 --> <row><v> NaN </v></row>
<!-- 1901-12-14 16:00:00 PST / -2147385600 --> <row><v> NaN </v></row>
...
<!-- 2005-08-30 17:00:00 PDT / 1125446400 --> <row><v> NaN </v></row>
<!-- 2005-09-01 17:00:00 PDT / 1125619200 --> <row><v> 0.0000000000e+00
</v></row>
<!-- 2005-09-03 17:00:00 PDT / 1125792000 --> <row><v> 0.0000000000e+00
</v></row>


The dates wrap around and I have real data at the bottom, but the same dates
appear multiple times in the dump.  Is it possible this is the problem with
graphing?  





On Mon, Sep 12, 2005 at 06:46:35PM -0700, Kate Ericson wrote:

> I'm getting a seg fault error while trying to graph using rrdtool version
> 1.0.46 on i386 Linux.  I can execute the rrdtool dump command (output at
> http://tech.teragrid.org/inca/TG/html/rrd_dump).  I think there might be a
> problem with my DEF line.  Any advice?  

From: Alex van den Bogaerdt <alex{at}ergens{dot}op{dot}het{dot}net> 
Date: Tue, 13 Sep 2005 04:44:31 +0200

It shouldn't segfault. That's not right.  Is 1.0.46 the latest version?
Checking...  no, it isn't, 1.0.50 is.  Maybe this is a known bug fixed
in newer versions.

Anyway, unless I'm mistaking, it should produce an error
message about a non-existing file.  This one to be precise:

"tgcp_to_ncsa_home,package=tgcp,service=transfer,serviceType=data,resource=i
a64,site=anl,vo=teragrid.rrd"

Yes, that's one big filename.  Or maybe it selects
"tgcp,service=transfer,serviceType=data,resource=ia64,site=anl,vo=teragrid.r
rd"
or maybe
"transfer,serviceType=data,resource=ia64,site=anl,vo=teragrid.rrd"
and so on.

Also, I'm not sure about the DEFinded datasource name "exitStatus,test"
or perhaps "exitStatus,test=tgcp_to_ncsa_home,package"
or perhaps "exitStatus,test=tgcp_to_ncsa_home,package=tgcp,service"
and so on.

Where did you get the idea to use commas and multiple equal signs?
What is your intention?

>
DEF:ncsa_home=exitStatus,test=tgcp_to_ncsa_home,package=tgcp,service=transfe
> r,serviceType=data,resource=ia64,site=anl,vo=teragrid.rrd:tgcp:LAST \

If you want datasource "tgcp" from file "teragrid.rrd", the line should read

DEF:ncsa_home=teragrid.rrd:tgcp:LAST
or
DEF:ncsa_home=/path/to/teragrid.rrd:tgcp:LAST

Simple:  name to use, followed by "=", followed by a filename, followed by
a colon, followed by the datasource name you want from that file, etc.

If you want multiple datasources, you need to use multiple DEF statements.
DEF:var1=/path/to/teragrid.rrd:ds1:LAST
DEF:var2=/path/to/teragrid.rrd:ds2:LAST
DEF:var3=/path/to/other.rrd:ds1:LAST
DEF:var4=/path/to/other.rrd:ds2:LAST

and so on.

HTH
Alex




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