[ofa-general] madrpc_init and reseting performance counters

[Ira Weiny]

On Fri, 11 Apr 2008 17:14:25 -0400
Dan Noe <dpn at isomerica.net> wrote:

> On 4/11/2008 17:08, Ralph Campbell wrote:
> > Also, be aware that opensm now tries to poll the performance
> > counters and keep a total. If you have more than one thing
> > in the system trying to keep track of the total, they will
> > conflict and each only see part of the total counts.
> 
> Yeah, this has been noted as a caveat.  The need to reset the counters 
> is a real pain.
> 
> Is there a way to access the counters maintained by OpenSM without some 
> fork/exec/parse mess?
> 

Yes, assuming you have the perfmgr enabled; OpenSM has 2 ways of getting the
counters out of the Performance Manager.

   a) use the console to dump the data to a file.
   b) write your own "plugin" to OpenSM and every time the perfmgr gets new
      data it will call your plugin.  What you do from there is entirely up to
      you.

Method A
========
Specify a dump file in the opensm.opts config file.

   #
   # Event DB Options
   #
   # Dump file to dump the events to
   event_db_dump_file /var/log/opensm_port_counters.log

Log into the console and use the command "perfmgr dump_counters" command:

   OpenSM $ perfmgr dump_counters

Your data will be in "/var/log/opensm_port_counters.log".  This file will be
overwritten each time you run dump_counters.


Method B
========
Look in the header opensm/osm_event_plugin.h for details on the interface.
Once you have a plugin compiled it can be loaded by the event_plugin_name
opensm.opts option:

   #
   # Event Plugin Options
   #
   event_plugin_name opensmskummeeplugin

The interface will be called each time there is new data available.  We are
using a plugin called opensmskummeeplugin[*] which puts all the data into a
MySQL DB ready for the cluster monitoring tool Skummee[#] to put it on a web
page for our operators.

Also to get you started there is a sample plugin in OpenSM "osmeventplugin".

Hope this helps,
Ira


[*] I hope to get this on a web page very soon.  It has been approved for
opensource by the lab...  ;-)  I don't know if it is appropriate to put in OFED
due to its dependence on MySQL and Skummee.

[#] https://sourceforge.net/project/screenshots.php?group_id=162032