Re: [hyades-dev] performance of hyades profiling

[Sébastien Mathy <sebastien.mathy@xxxxxxxxxxx>]

Thank for your reply.

I've tried to increase the data collection engine buffer size to 64m
with no change.
I want to know the duration of a method called count().
When I do :
long start = System.currentTimeMillis();
count();
long end = System.currentTimeMillis();
System.out.println("Total time was " + (end - start)
                + " milliseconds\n\n");

This prints : Total time was 2578 milliseconds

When I look at the profiling vue, it estimates the time at 6480 ms.
If I set filters to collect only the method count, the profiling vue
estimates it at 5560 ms.
Which is right?

Regards

--
Sebastien Mathy

Richard Duggan a écrit :
> 
> 
> 
> 
> Sebastien,
> 
> The performance of the profiler is directly proportional to the amount of
> data you are trying to collect at any point in time.  We have designed the
> profiler so that when you are not actively monitoring an application the
> overhead is negligible.  As you start turning up the knobs the end user
> impact will increase.  In order to address this in the analysis, we also
> collect the amount of overhead introduced by the profiler.  This overhead
> is then removed from the analysis view.
> 
> You can tweek the performance by modifying the data collection engine to
> have larger data buffers.  This will help with the responsiveness when
> large amounts of data are being collected.
> 
> Richard K. Duggan
> Problem Determination Enablement
> IBM Toronto Laboratory
> External: 905-413-2396
> Internal: 969-2396
> 
> 
> 
>                                                                            
>              Sébastien Mathy                                               
>              <sebastien.mathy@                                             
>              kereval.com>                                               To 
>              Sent by:                  hyades-dev@xxxxxxxxxxx              
>              hyades-dev-admin@                                          cc 
>              eclipse.org                                                   
>                                                                    Subject 
>                                        [hyades-dev] performance of hyades  
>              10/01/2004 10:15          profiling                           
>              AM                                                            
>                                                                            
>                                                                            
>              Please respond to                                             
>                 hyades-dev                                                 
>                                                                            
>                                                                            
> 
> 
> 
> 
> Hi,
> I'm trying to profile a standalone java application whith Hyades. This
> application counts the words of a file using different implementation.
> When I execute this application without profiling it takes about 5
> seconds. When I execute it with profiling agent (locally or remotly) it
> takes about 20 seconds. I have unchecked the instance level information
> and I have set correct filters.
> I use :  - Hyades and RAC version 3.0.1
>               - SUN JVM 1.4.2
>               - Eclipse 3.0
> 
> Have I done something wrong?
> Have you some informations about the impact of Hyades profiling tool on
> the SUT?
> 
> Regards
> --
> Sebastien Mathy
> (See attached file: sebastien.mathy.vcf)

begin:vcard
fn;quoted-printable:S=C3=A9bastien Mathy
n;quoted-printable:Mathy;S=C3=A9bastien
email;internet:sebastien.mathy@xxxxxxxxxxx
x-mozilla-html:FALSE
version:2.1
end:vcard