I think that the seconds and microseconds are in absolute times (as in
from the gettimeofday() call).
This particular event tracing mechanism is pretty limited, but you can
see how it breaks down by looking in pvfs2-event.h. That shows what the
api and event values mean so that you can see what is disk (trove) and
what is network (bmi), and also look at specific operations (like bmi
send, for example).
There is no tracing of the client with this mechanism, it is server side
only.
This trace information makes no distinction between I/O servers and meta
servers; it should be showing you data for all of the servers regardless
of their role.
-Phil
Nirmal Thacker wrote:
I forgot to add the attachment.
Its here now
This is a full trace , with api and operations set to 0xFFFF
-nirmal
Nirmal Thacker wrote:
Hello,
When I trace events in PVFS2, using the pvfs2-set-eventmask and
pvfs2-event-mon-example I get a randomly large counter for the seconds
and microseconds for each trace.
I have all my servers and clients synced using NTP .
I have attached a trace of 16 clients to 4 I/O servers, 1 MDS server
[separate MDS] opening 2500 files using the mpi-md-test distributed with
pvfs2. The entire operation too about 17 seconds.
The large seconds value is used more as a counter. As I can see the
number of microseconds each operation takes and this increments the
seconds counter later eventually. But my question is- why do you have
such a large counter- does this number mean something and how is it
generated?
The total amount of time spent at servers doesnt seem to be more than a
second. For example server No. 3 [in the trace file] has all its
operations done in 0.165442 microseconds . I obtained this value from
the difference in the timing counters of the first and last trace for
server no. 3.
Am I interpreting this right?
If yes, can it be possible for me to obtain a time breakup of time spent
over the network, Client, Disk etc?
Finally, I can see traces for servers 0,1,2,3. These would be the I/O
servers. How can I generate MDS traces or view the times for MDS operations?
Thanks
Nirmal
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