Dear Valeriy
Thank you for the test code, now I understand. I have tried your examples
with 10,000 objects only, otherwise it would be too slow:
It takes 7 seconds to display the 11 special icons, after
double-clicking one
icon it takes another 7 seconds to display the 1000 objects.
The reason for these long delays is probably, that I am using Fink
on a PowerBook 550MHz with MacOS X 10.2.4.
However, the Mac OS X Finder is known to be very slow, and the
finder needs only 2 seconds to display the 10,000 system files, in
contrast to the root browser with 115 seconds.
Even though items are not hidden when using grouped objects, this
feature was probably incorporated because of the slowness of the
root browser.
In my opinion TRootBrowser should be optimized for speed in the
same way as Apple had (and still has to) optimize the Finder for speed.
Best regards
Christian
P.S.: Hopefully, at least Apple seems to have made dramatic improvements
with today´s introduction of the fastest Personal Computer of the world,
featuring dual IBM 64-bit Power4 (G5) processors with 2GHz, and the
introduction of Panther, i.e. Mac OS X 1.3 with a new finder!!!
Valeriy Onuchin wrote:
> Hi Christian,
>
>
>
>>Dear Valeriy
>>
>>Thank you for your answer.
>>I am not sure if I understand it correctly: Do you mean to place
>>100 000 TObjects in TFile?
>>
>>
>
>yes, it works with TFiles
>
>
>
>>What I did at the moment is to create a system directory with
>>10,000 empty text-files in it.
>>It took TRootBrowser 115 seconds to open this directory, which
>>is much too slow to be useful.
>>
>>
>
>This option doesn't work with TSystemFiles. Nevertheless yours
>number is strange. I made similar tests on my average computer
>(linux,pentium-2, 800MHz). Response is much faster than in your case.
>BTW it's faster than KDE-2 browser.
>
>
>
>>Do you mean that grouped items are hidden from the browser
>>because of this slowness?
>>
>>
>
>Not correct statement. Items are not hidden. You can display content
>of the group by clicking on "group icon".
>
>
>
>>Do you have some simple example?
>>
>>
>
>Try from root prompt:
>
>li = new TList();
>for (int i=0; i<100000; i++) li->Add(new TObject());
>gROOT->GetListOfBrawsables->Add(li);
>new TBrowser();
>
>Click on TList in the left part of browser.
>
>Regards. Valeriy
>
>
>
>>Best regards
>>Christian
>>
>>Valeriy Onuchin wrote:
>>
>>
>>
>>>Hi Christian,
>>>browsing container with a large number of object (e.g. 100 000)
>>>its content is displayed as a set of "grouped items" (you will see
>>>a set of special icons in the right part of browser).
>>>fGroupSize determines a number of items in each group.
>>>To find in which group specific item is located you can either invoke
>>>search dialog by clicking Ctrtl-F F7 keys or determine from
>>>a name of the group which is "name_of_first_item-name_of_last_item".
>>>This is done to make browsing of large containers to be effective.
>>>You can disable this feature by setting fGroupSize to some very large
>>>number, e.g. 100 000 000.
>>>
>>>Regards. Valeriy
>>>
>>>
>>>
>>>
>>>
>>>
>>>>Dear Rooters
>>>>
>>>>Currently, I am trying to understand the code from TRootBrowser,
>>>>and I have problems with TRootIconBox::AddObjItem():
>>>>
>>>>What is the reason of "fGroupSize" and "fGrouped"?
>>>>
>>>>What does "switch to global view mode" mean?
>>>>
>>>>What does ("Browser.GroupView","1000") mean, i.e.
>>>>groupsize = 1000 vs 10000000 if unchecked??
>>>>(I know that the default is set in system.rootrc, but I do
>>>>not know the reason for this setting.)
>>>>
>>>>When I check/uncheck Menu "Group Icons", I do not see
>>>>any difference in the behavior of TRootBrowser, either.
>>>>
>>>>Thank you in advance
>>>>
>>>>Best regards
>>>>Christian
>>>>_._._._._._._._._._._._._._._._
>>>>C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a
>>>>V.i.e.n.n.a A.u.s.t.r.i.a
>>>>_._._._._._._._._._._._._._._._
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>
>
>
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:12 MET