I don't write much code nowadays, so I'm going to need a lot of help
with this.
I dug through the ganglia code and I found this interesting tidbit in
libmetrics/aix/metrics.c which may be indicative of the problem.
There's an assignment from cur_ninfo.ibytes to cur_net_stat.ibytes, but
the types of the two variables are different.
net_stat::ibytes is a double:
struct net_stat{
double ipackets;
double opackets;
double ibytes;
double obytes;
} cur_net_stat;
and we have *ninfo declared here:
perfstat_netinterface_total_t ninfo[2],*last_ninfo, *cur_ninfo ;
libperfstat.h has perfstat_netinterface_total_t::ibytes as u_longlong_t.
Does this code try to do what I think it is doing, i.e. assign an
unsigned 64 bit integer to a signed 64bit integer?
I'm willing to test the code if someone who's more adept at coding and
building will take on the challenge.
It looks to me that the type mismatch will have to fixed in a few
places, such as CALC_NETSTAT, and we'll have to add an unsigned long
long to g_val_t too. Those are the ones I can see so far.
David Wong
Senior Systems Engineer
Management Dynamics, Inc.
Phone: 201-804-6127
[EMAIL PROTECTED]
-----Original Message-----
From: Martin Knoblauch [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 28, 2007 12:00 PM
To: David Wong; [email protected]
Subject: Re: [Ganglia-general] Help! I have a petabyte/s network
David,
as far as I remember, the AIX metrics code had an overflow/wrap-around
problem prior to 3.0.4. Maybe the fixes are not thorough enough.
The packets/sec are of course less affected.
Cheers
Martin
--- David Wong <[EMAIL PROTECTED]> wrote:
> Ganglia is reporting that I'm pushing up to 200 Petabytes/s through
> my
> network. Nobody tell the network admin!
>
> I'm running Ganglia 3.0.4 with the Power5 add-ons on AIX5.3
>
> Bytes in and out statistics generally appear to have the right
> values.
> However at random times, I get spikes in the petabytes/s range.
>
> Here's a dump of the bytes_in database. At first, I suspected
> perhaps
> these coincide with some counters getting reset, but they don't occur
> at
> regular intervals.
>
> <!-- 2007-03-27 20:42:00 GMT / 1175028120 -->
> <row><v> 1.9268390706e+05 </v></row>
> <!-- 2007-03-27 20:48:00 GMT / 1175028480 -->
> <row><v> 1.5833184975e+05 </v></row>
> <!-- 2007-03-27 20:54:00 GMT / 1175028840 -->
> <row><v> 1.6838302753e+05 </v></row>
> <!-- 2007-03-27 21:00:00 GMT / 1175029200 -->
> <row><v> 1.3766069592e+05 </v></row>
> <!-- 2007-03-27 21:06:00 GMT / 1175029560 -->
> <row><v> 2.1711888414e+05 </v></row>
> <!-- 2007-03-27 21:12:00 GMT / 1175029920 -->
> <row><v> 4.9959709273e+16 </v></row>
> <!-- 2007-03-27 21:18:00 GMT / 1175030280 -->
> <row><v> 1.7401339783e+05 </v></row>
> <!-- 2007-03-27 21:24:00 GMT / 1175030640 -->
> <row><v> 2.0955720861e+05 </v></row>
> <!-- 2007-03-27 21:30:00 GMT / 1175031000 -->
> <row><v> 1.9032255300e+05 </v></row>
> <!-- 2007-03-27 21:36:00 GMT / 1175031360 -->
> <row><v> 1.9162727036e+05 </v></row>
> <!-- 2007-03-27 21:42:00 GMT / 1175031720 -->
> <row><v> 1.2703790825e+05 </v></row>
>
> Can anyone shed light on what might be happening? Any pointers for
> debugging?
>
> David Wong
> Senior Systems Engineer
> Management Dynamics, Inc.
> Phone: 201-804-6127
> [EMAIL PROTECTED]
>
>
>
>
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------------------------------------------------------
Martin Knoblauch
email: k n o b i AT knobisoft DOT de
www: http://www.knobisoft.de
