Performance Issue with ForEach loop

[AK]

Hi Everyone,

For Last a few weeks I have been involved with performance tuning of an
application. I have observed that if I do a loop over a collection
(ArrayList/HashTable) which has 50000 objects in one shot then it takes about
15 minutes to do the computation. But if I break this to loop of only 5000
objects and do all computation in 10 loops of 5000 each then it takes about 1
minutes 30 seconds.

I am trying to find a reason for this but I haven't been able to get one. If
I do a search on net then it becomes more confusing as some will say don't
use ForEach while some would say use only ForEach. I don't know which advice
to take.

(I have tried using For loop also but result is some what the same).

The loop code look like:
foreach(MyClass obj in listcollection)
{
// do something with this obj.
}
Can someone throw some light on the possible reasons for above mentioned
observations.

Thanks in advance,
AMar.

[Jon Skeet [C# MVP]]

AK <[e-mail]> wrote:

<snip>

Can someone throw some light on the possible reasons for above mentioned
observations.

Please see my reply in the performance newsgroup.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too

[Rick Lones]

Jon Skeet [C# MVP] wrote:

AK <[e-mail]> wrote:

<snip>

Can someone throw some light on the possible reasons for above mentioned
observations.

Please see my reply in the performance newsgroup.

Jon, could you supply the name of this newsgroup please (or a link to your
post). I am also interested in seeing the answer(s) on this one.

Thanks,
-rick-

[Chris Dunaway]

I believe it is Microsoft.public.dotnet.framework.performance