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Forum Topic - 4.5.1 20081104 - Application Profiler - wrong accounting: (6 Items)

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Hans-Peter Reichert

11/07/2008 7:42 AM

post16167

4.5.1 20081104 - Application Profiler - wrong accounting

I am using AppProf importing a session from a given k-trace.
when I  now compare the numbers given by AppProf for a certain Thread with the numbers that are shown for this thread 
within SP Event Owner stats, they do not match.
Looks like there is kind of an offset within the thread numbers by two.
If it would have been by 1, I would say that the tid adjustment that is needed for 6.3.2 and IDE is missing.
But it is 2, so maybe the tid adjustment is done with a wrong sign + instead of - 1
/hp

Hans-Peter Reichert

11/07/2008 10:28 AM

post16192

Re: 4.5.1 20081104 - Application Profiler - wrong accounting

I am not 100% sure whether the problem is exactly like I've discribed,
but the reported numbers in time are realy strange and do not match those reported in CPU usage.
So in AppProf I see bigger shallow numbers than the thread runs in total.
/hp

Elena Laskavaia

11/07/2008 10:31 AM

post16194

Re: 4.5.1 20081104 - Application Profiler - wrong accounting

Instrumented run is not really applicable to multi-thread process because it does not take into account context switches
 right now.
I.e. numbers would not match with system profiler.

Hans-Peter Reichert wrote:
> I am not 100% sure whether the problem is exactly like I've discribed,
> but the reported numbers in time are realy strange and do not match those reported in CPU usage.
> So in AppProf I see bigger shallow numbers than the thread runs in total.
> /hp
> 
> _______________________________________________
> General
> http://community.qnx.com/sf/go/post16192
>

Hans-Peter Reichert

11/07/2008 10:37 AM

post16196

Re: 4.5.1 20081104 - Application Profiler - wrong accounting

if this is the problem,
why is "Execution Time" using the thread objects as top most elements?
this is implying wrong associations.

Elena Laskavaia

11/07/2008 10:47 AM

post16200

Re: 4.5.1 20081104 - Application Profiler - wrong accounting

It records events that belong to threads independently. In case if threads are not running truly in parallel it would 
produce right results.
But it should consider context switches to be useful for multithreaded apps. I opened a report about it.

Hans-Peter Reichert wrote:
> if this is the problem,
> why is "Execution Time" using the thread objects as top most elements?
> this is implying wrong associations.
> 
> 
> _______________________________________________
> General
> http://community.qnx.com/sf/go/post16196
>

Hans-Peter Reichert

11/07/2008 10:50 AM

post16201

AW: 4.5.1 20081104 - Application Profiler - wrong accounting

OK - thanks
/hp 

>-----Ursprüngliche Nachricht-----
>Von: Elena Laskavaia [mailto:community-noreply@qnx.com] 
>Gesendet: Freitag, 7. November 2008 16:47
>An: general-ide
>Betreff: Re: 4.5.1 20081104 - Application Profiler - wrong accounting
>
>It records events that belong to threads independently. In 
>case if threads are not running truly in parallel it would 
>produce right results.
>But it should consider context switches to be useful for 
>multithreaded apps. I opened a report about it.
>
>Hans-Peter Reichert wrote:
>> if this is the problem,
>> why is "Execution Time" using the thread objects as top most 
>elements?
>> this is implying wrong associations.
>> 
>> 
>> _______________________________________________
>> General
>> http://community.qnx.com/sf/go/post16196
>> 
>
>_______________________________________________
>General
>http://community.qnx.com/sf/go/post16200
>
> 

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