On Nov 18, 2008, at 12:15 PM, Nirmal Thacker wrote:
Ok this is working but I want to make sure.
First I run the pvfs2-set-eventmask *on the server* with the API and
Operations flag
I perform the I/O, in my case this would be running a code or
benchmark
I turn off the pvfs2-set-eventmask on the server passing the NULL
values
to the API and operations flag
Finally on the client, I run the pvfs2-event-mon-example and get the
output.
For one- is this process correct, since Im confused where I must run
the
pvfs2-set-eventmask utility - it works fine at both ends
It doesn't matter where you run it.
For another, the pvfs2-event-mon-example output is a trace of I/O at
all
the servers? Does this mean that the tracing occurs at each server and
is sent over the network to the client which runs the
pvfs2-event-mon-example utility?
Yes.
Could I also understand how to interpret this output? There are 8
columns of numbers. For example:
3 2 1 65536 0 2 1227047834 726432
It prints a format at the beginning.
-sam
Nirmal
Sam Lang wrote:
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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