Re: [Jikesrvm-researchers] HPM display result

[Peter F S. <pf...@us...>]

Dayong,

        These casts look wrong and should be removed.  I will update the 
CVS repository once I can validate with a build.   Thank you for pointing 
this out.

        I believe that the EventSet message is coming from PAPI.  I have 
no insight.

        The Jikes RVM userguide HPM documentation is for AIX's pmapi 
interface to access the HPMs.  There is no documentation for using PAPI. 
In the spirit of open source, you are encourage to contribute the PAPI 
documentation.

Peter
-------------------------
Peter F. Sweeney
Research Staff Member
IBM, T. J.  Watson Research Center
(914) 784-6390  IBM Tie-line 8-863-6390





Dayong Gu <dg...@cs...> 
Sent by: jik...@li...
05/18/2005 05:45 PM
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[Jikesrvm-researchers] HPM display result






Hi,

I used a jikesrvm-2.3.4 on an Athlon machine.
I build it with support of HPM (using PAPI), after do some modification to
make it adaptable to the PAPI3.0 on my PC, I found
the output ( when use -X:hpm:report=true) is wrong.

For some very large "long" numbers which are more than 10 times larger 
than the Max  value of
"integer", the output just show a very small number ( < 10 for most 
cases).

I think it is just because of these unnecessary cast from 'long' to 
'int' in file,

rvm/src/vm/HPM/HPM_counters.java:

method  format_long(long value)

line 121:  int remainder = (int)(l_value - ((int)(l_value/10))*10); 
and
line 124: l_value = (int)(l_value/10);

After remove these cast, the output seems ok.
Could somebody confirm me it is safe to do so,  or I actually did 
something wrong.

BTW:  I always get an error "EventSet is currently not running!" in the 
end, could
somebody enlight me for a possible reason?  Thanks!!

I also found the  using performance monitors part of the online manual 
is too old,
Is there some place I can find a more detailed introduction for using 
PAPI in JikesRVM?


Cheers, Dayong








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