RE: [Gems-users] Obtaining statistics from a Demo Prefetcher like model

["Mike Marty" <mikem@xxxxxxxxxxx>]

The easiest way is to add your statistics to ruby/profiler/Profiler.[Ch] by
adding variables and functions that are called by your class object.

However there is only a single, system-wide Profiler object.  If you wanted
per-object stats, it would take some bit of work to track this in the single
Profiler instance.  

If you wanted each object instance to collect its own stats internally and
then dump then out when "ruby0.dump-stats" is performed, you can add a
printStats() method to your class and change the framework to call this at
the right time.  

When ruby0.dump-stats is invoked, System::printStats() is called in
ruby/system/System.C.  At the end of this method, it will call
Chip::printStats().  Unfortunately this is a call to a static method, and
assuming that your object is instantiated from a SLICC controller, this
won't work.   In the past, I've personally added a Chip::printDynamicStats()
to my own tree which is a non-static method.  In System::printStats(), I
loop through all the Chip instances and call printDynamicStats() on it.  I
then modified SLICC so that Chip.[Ch] contains this printDynamicStats()
method which, for any class instantiated within a SLICC controller that has
the "dump_stats" flag set, it will call some method in your object.  So when
I instantiated an object in a SLICC controller, I did so like the following:

MyObject myObject, dump_stats="yes";

Essentially I extended SLICC to recognize this and it generated the
appropriate code in Chip.C to call printStats() on this object when that
flag existed.

Unfortunately (for you), I never bothered checking in this code and
eventually threw it away!  But it should be easy to add yourself.  Hacking
SLICC is pretty easy.  Just look at Chip.C-- it will tell you where in SLICC
it was generated.  You don't even need to modify the parser to recognize the
dump_stats="yes" because it already builds up a list of these pairs which
you can check the existence of.  

--Mike



> -----Original Message-----
> From: gems-users-bounces@xxxxxxxxxxx [mailto:gems-users-
> bounces@xxxxxxxxxxx] On Behalf Of Sean Ryan Leventhal
> Sent: Tuesday, September 13, 2005 7:26 AM
> To: gems-users@xxxxxxxxxxx
> Subject: [Gems-users] Obtaining statistics from a Demo Prefetcher like
> model
> 
> I have modified several protocols in a way similar to that in the Demo
> Prefetcher example (including a class interface into slicc).  How can I go
> about placing statistics from this class into the ruby statistics output?
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