[rrd-users] rrdtutorial not working

[Tjerk.Kusters at imtech.nl]

Hello Tobias,

I read that there can be a problem when using mmap/munmap on NFS.
On http://nfs.sourceforge.net/ there is a part over mmap and NFS. According
to the msync man page  you should use msync before a munmap.

I have add 2 msync function call in rrd_update.c and it looks to help.

#ifdef HAVE_MMAP
                msync(rrd_mmaped_file, rrd_filesize,MS_SYNC);
                munmap(rrd_mmaped_file, rrd_filesize);
#endif

Is there a reason that you don't use a msync?

best regards,
Tjerk



-----Tobias Oetiker <tobi at oetiker.ch> wrote: -----

>To: Tjerk.Kusters at imtech.nl
>From: Tobias Oetiker <tobi at oetiker.ch>
>Date: 07-09-2007 11:42
>cc: rrd-users at lists.oetiker.ch
>Subject: Re: [rrd-users] rrdtutorial not working
>
>Hi Tjerk,
>
>my guess is that the 'time' on your vmware host is not correct ...
>
>cheers
>tobi
>
>Today Tjerk.Kusters at imtech.nl wrote:
>
>>
>>
>>
>>
>>
>> Hello,
>>
>> I am storing the rrd files on a nfs mounted filessytem, which is the cause

>> of the problems.
>> Is there a solution to this problem?
>>
>> Regards,
>> Tjerk
>>
>> -----rrd-users-bounces at lists.oetiker.ch wrote: -----
>>
>> >To:Â rrd-users at lists.oetiker.ch
>> >From:Â Tjerk.Kusters at imtech.nl
>> >Sent by: rrd-users-bounces at lists.oetiker.ch
>> >Date:Â 05-09-2007Â 16:24
>> >Subject: [rrd-users]  rrdtutorial not working
>> >
>> >
>> >
>> >
>> >
>> >
>> >Hello,
>> >
>>
>>I have a problem to get the example in the tutorial to work, atÂ

>least on a
>>
>>Fedora 6 Vmware machine it is not working. I am getting an emptyÂ

>graph. The
>>
>> >graph is oke when a I run the same command's on Windows .
>> >
>> >Fedora: RRDtool 1.2.23 (rrdtool-1.2.23-6.fc6)
>> >Windows: RRDtool 1.2.23 (binary from website)
>> >
>> >Looks like the samething happens with a script I created...
>> >
>> >[root at master dp02]# rrdtool lastupdate sensorinfo.rrd
>> > cpufan cputemp mbtemp
>> >
>> >1189002120:Â 3351Â 41Â 33
>> >
>> >
>> >When I use this command:
>> >
>> >[root at master dp02]# rrdtool xport --start end-1h
>> >DEF:ds=sensorinfo.rrd:cputemp:AVERAGEÂ XPORT:ds:mem
>> >
>> >I am getting:
>> >
>> ><?xml version="1.0" encoding="ISO-8859-1"?>
>> >
>> ><xport>
>> >Â Â <meta>
>> >Â Â Â Â <start>1188998580</start>
>> >Â Â Â Â <step>60</step>
>> >Â Â Â Â <end>1189002180</end>
>> >Â Â Â Â <rows>61</rows>
>> >Â Â Â Â <columns>1</columns>
>> >Â Â Â Â <legend>
>> >Â Â Â Â Â Â <entry>mem</entry>
>> >Â Â Â Â </legend>
>> >Â Â </meta>
>> >Â Â <data>
>> >--cut--
>> >Â Â Â Â <row><t>1189001880</t><v>NaN</v></row>
>> >Â Â Â Â <row><t>1189001940</t><v>NaN</v></row>
>> >Â Â Â Â <row><t>1189002000</t><v>NaN</v></row>
>> >Â Â Â Â <row><t>1189002060</t><v>NaN</v></row>
>> >Â Â Â Â <row><t>1189002120</t><v>NaN</v></row>
>> >Â Â Â Â <row><t>1189002180</t><v>NaN</v></row>
>> >Â Â </data>
>> ></xport>
>> >
>> >Any idea what the problem can be?
>> >
>> >Regards,
>> >Tjerk
>> >
>> >_______________________________________________
>> >rrd-users mailing list
>> >rrd-users at lists.oetiker.ch
>> >https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
>> >
>> >
>>
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>>
>>
>
>--
>Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
>http://it.oetiker.ch tobi@oetiker.ch ++41 62 213 9902
>