perfsonar development work

[Nicolas Simar <>]

Hi Michael,

Michael Bischoff wrote:
> Hello all,
>
> To add my 2 cents: I think it's dangerous to presume things about what 
> optimisation would
> work; from practise we discovered that the worst hotspot is almost never 
> where you presume it
> is.
>
> To quote Jeff Kesselman(author of http://java.sun.com/docs/books/performance/)
> "You may think you know what your performance problem is, but you are 
> probably wrong. I've
> been tuning code the better part of 15 years and I don't think my initial 
> guess as to what my
> problem was has been right more then once or even close more then twice."
>
> On an other note implementing streaming would require quite a change to the 
> personar base
> code, this is just because how the data currently reaches the ServiceEngine. 
> Although there
> are elegant solutions around that too. esp with respect to 'incremental DOM'
>
> On jet an other note: I can't speak for the whole Java crowd but sending 
> serialised java
> around isn't something I would lean to Java RMI uses that and it gave 
> everyone performance
> headaches.
>
> About instrumenting/profiling
>
> For java:
> Netbeans has en excellent profiler
> Management beans (I think they where introduced in 1.5)

Have you had experience with profiling? I am looking for someone who 
could report on his experience in profiling and explaining what needs 
tobe done.

> In general, I think that ideally, we would want a continuous integration 
> server which also
> does profiling so we can monitor performance improvements along different 
> versions and also
> spot regressions right away.

Can you explain that to me (as if you were explaining the benefit of 
such continuous integration server to a child of 10 years ;) )

Thanks,
Nicolas

> Best regards,
>
> Michael Bischoff

--
Nicolas
______________________________________________________________________

Nicolas Simar
Network Engineer

DANTE - www.dante.net

Tel - BE: +32 (0) 4 366 93 49
Tel - UK: +44 (0)1223 371 300
Mobile: +44 (0) 7740 176 883

City House, 126-130 Hills Road
Cambridge CB2 1PQ
UK
_____________________________________________________________________