Hi Damir,
I think the perfomance degradation you've seen is the consequence of
using the TrueType fonts. In version 3.03 there was no TT fonts, but in
3.05 they was included into distributed sources. So you can try to
experiment with system.roorc or ~/.rootrc file with an option
# Path where to look for TrueType fonts
Unix.*.Root.UseTTFonts: true
Change the value to "false" and run your benchmarks again. Hope this helps
Best regards,
Stanislav.
Damir Buskulic wrote:
> Hi,
>
> There seems to be a drawing speed problem in the version 3/05.04 that
> we use for online display. The small macro attached gives the
> following results :
>
> Under OSF1/v5 (alpha XP1000 667 MHz):
> root/v3/05.04: Real Time = 12.25 seconds Cpu Time = 6.40 seconds
> root/v3/03.08: Real Time = 8.47 seconds Cpu Time = 3.52 seconds
>
> Under Linux/RedHat v7.1 (PC i686 1.8 GHz):
> root/v3/05.04: Real Time = 14.40 seconds Cpu Time = 5.06 seconds
> root/v3/03.08: Real Time = 10.13 seconds Cpu Time = 3.36 seconds
>
> Does anyone see this ? Were there changes in the low level layers of
> ROOT or in TH painter that could explain this ? On some of our
> programs we saw a speed decrease of a factor 4 but this is much more
> difficult to characterize simply. So here is the program :
>
> ______________________________________________________________
> #include "TPad.h"
> #include "TBenchmark.h"
> #include "TH1.h"
>
> void test_speed()
> {
> gBenchmark->Reset();
> gBenchmark->Start("testspeed");
> TH1F* h = new TH1F("h","test_speed",20000,0,1);
> h->FillRandom("pol1",10000);
> for (int i=0;i<100;i++) {
> h->Draw();
> gPad->Update();
> }
> gBenchmark->Show("testspeed");
> }
> ______________________________________________________________
>
> By the way, the difference is seen in interpreted as well as compiled
> mode.
>
> We would be grateful if anybody can help
>
> Cheers
>
> Damir
>
> ====================================
> Damir Buskulic, Universite de Savoie/LAPP
> Chemin de Bellevue, B.P. 110, F-74941 Annecy-le-Vieux Cedex, FRANCE
> Tel : +33 (0)450091600
> e-mail: buskulic@lapp.in2p3.fr
> ====================================
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