[PD] OS X performance

Mirko Petrovich prab at terra.cl
Wed Jul 28 03:54:28 CEST 2004

chris clepper wrote:

> On Jul 26, 2004, at 10:47 PM, Mirko Petrovich wrote:
>> Hi all,
>> I'm a Linux user an I'm very happy with pd performance in my desktop 
>> (PIII 800MHz). Yesterday I tried pd 0.37-1 from Miller's site in a 
>> Powerbook G4 (1GHz). I compared the cpu usage with patch 
>> 08.convobros.pd and I saw a big difference. In the Linux system it 
>> uses about 0.1% and in the G4 about 20%. Why this big difference ?
> I just looked at the patch and profiled it.  My 1Ghz laptop used about 
> 13% CPU as measured by top.  The 0.1% number looks pretty bogus to me 
> as the P3 is hardly a floating point monster and roughly equivalent to 
> a PPC 7450 clock for clock. 

Ok, I did another test. I put 450 [osc~ 1000] and P3 used about 90% CPU. 
In the G4 I put 400 [osc~ 1000] and top showed 0% !!?? I remember seeing 
the same behaviour in a desktop G4 400MHz with Max/MSP in OS9.

> I have noted discrepancies between top and the real-world on x86 chips 
> in the past (tasks that obviously take lots of time to complete show 
> up as near zero CPU load).

If you don't trust in top numbers I can tell you I can run big patches like Pluton or Jupiter extremely well.Anyway, there's one thing I don't understand, why a 266Mhz G3 using Linux shows the same CPU usage than a 1GHz G4 using OSX ?

quoting cr:

> convobros uses 12-15% cpu on 262mhz g3 , debian, gcc 3.3.3 -funroll-loops.


Mirko Petrovich        

More information about the Pd-list mailing list