Re: [Pvfs2-users] Event tracing

Tue, 18 Nov 2008 09:59:28 -0800
You need to run the pvfs2-event-mon-example app on the client. The total process would be: 

pvfs2-set-eventmask -m /pvfs2mnt/ -a 0xFFFF -o 0xFFFF
< perform file system workload >
pvfs2-set-eventmask -m /pvfs2mnt/ -a 0 -o 0

pvfs2-event-mon-example -m /pvfsmnt/

The output of that tool is to stdout.

-sam

On Nov 18, 2008, at 11:33 AM, Nirmal Thacker wrote:


Yes Im looking at /tmp/pvfs2-server.log . Where would the events  
tracing

output be recorded?
Nirmal
Sam Lang wrote:


On Nov 18, 2008, at 11:17 AM, Nirmal Thacker wrote:


Thanks for this, Sam.

Although I've noticed that the events are recorded as HH:MM .


They are seconds, microseconds.  Are you looking at the PVFS logging
output instead of the PVFS events tracing output?
-sam


I figure
that if I need more fine grained timings, I would have to add this
myself?


Yes client side tracing would be helpful- has anyone performed any  
kind

of tracing through the VFS- is it possible to capture maybe the VFS

related operations with a more VFS generic tracing tool and hence  
this

might be the reason client tracing is not developed in PVFS?

Nirmal
Sam Lang wrote:


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
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