[Pvfs2-users] Event tracing

[Sam Lang]

Nirmal,

We don't have a tracing component for the VFS.  Component tracing on  
the server is enabled for each component with:

pvfs2-set-eventmask -a 0x4 -o 0x9

That enables the TROVE api (disk accesses), specifically the  
WRITE_LIST operation is only enabled.  The values of the api and  
operation must be hexidecimal.  See the list of apis and operations  
below.

The current version of PVFS doesn't support event tracing on the  
client.  We hope to have that working in a future version though.

-sam

APIs:

BMI 	0x2
TROVE 	0x4
SM 		0x80


     Operations:

      BMI_SEND = 1,
      BMI_RECV = 2,
      FLOW = 3,
      TROVE_READ_AT = 4,
      TROVE_WRITE_AT = 5,
      TROVE_BSTREAM_FLUSH = 6,
      TROVE_KEYVAL_FLUSH = 7,
      TROVE_READ_LIST = 8,
      TROVE_WRITE_LIST = 9,
      TROVE_KEYVAL_READ = 10,
      TROVE_KEYVAL_READ_LIST = 11,
      TROVE_KEYVAL_WRITE = 12,
      TROVE_DSPACE_GETATTR = 13,
      TROVE_DSPACE_SETATTR = 14,
      TROVE_BSTREAM_RESIZE = 15,
      TROVE_KEYVAL_REMOVE = 16,
      TROVE_KEYVAL_ITERATE = 17,
      TROVE_KEYVAL_ITERATE_KEYS = 18,
      TROVE_DSPACE_ITERATE_HANDLES = 19,
      TROVE_DSPACE_CREATE = 20,
      TROVE_DSPACE_REMOVE = 21,
      TROVE_DSPACE_VERIFY = 22,
      TROVE_BSTREAM_VALIDATE = 23,
      TROVE_KEYVAL_VALIDATE = 24,
      TROVE_KEYVAL_WRITE_LIST = 25,
      TROVE_KEYVAL_GET_HANDLE_INFO = 26,
      TROVE_DSPACE_GETATTR_LIST = 27,
      TROVE_KEYVAL_REMOVE_LIST = 28,


On Nov 18, 2008, at 10:24 AM, Nirmal Thacker wrote:

> That would be great!
> I'd like to probably trace each of those separately and if there is  
> any
> tracing possible on the client side as well
> Particularly the client side VFS tracing when I go through the VFS  
> would
> be interesting to note. I'd also like the server operation and disk
> operation traces and network traces to discount for the time I spend  
> on
> the network
>
> Nirmal
> Sam Lang wrote:
>>
>> Hi Nirmal,
>>
>> You can restrict it to trace only network events, only disk events,  
>> or
>> only server operation events.  The default event driver just keeps a
>> ring of events until they're requested with pvfs2-event-mon-example.
>> Unfortunately, there's no good documentation for it.  I can give you
>> more detail if you need it.  What are you are looking to do?
>>
>> -sam
>>
>> On Nov 13, 2008, at 12:54 PM, Nirmal Thacker wrote:
>>
>>> Hello,
>>>
>>> I am trying to perform event tracing with PVFS- before I maybe  
>>> perform
>>> my own instrumentation, I wanted to check out pvfs2-set-eventmask
>>>
>>> I mostly understood its one form of usage from a thread on the list
>>> archives
>>> [http://www.beowulf-underground.org/pipermail/pvfs2-developers/2006-January/001774.html 
>>> ]
>>>
>>>
>>> I'd like to know if there are more variations to the usage. For  
>>> example
>>> are there more levels of tracing? Can the tracing be restricted to  
>>> only
>>> what I require?
>>>
>>> Is this documented in more detail somewhere ?
>>>
>>> Thanks
>>> Nirmal
>>> _______________________________________________
>>> Pvfs2-users mailing list
>>> Pvfs2-users at beowulf-underground.org
>>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
>>
>