Performance between LV6.1 + Mac OS9 and LV7 + Mac OSX

[Olivier-JOURDAN]

Hi,
I use a PowerMac G4 bootable on OS9 and OSX (10.2.8). I run one application (G progamming + CIN) on the 2 OS (one in LV6.1 and one in LV7).
My application do Real Time analyse. My problem is performances are better on OS9 than on OSX !!!
I don't understand why? Anybody has a little idea of the origin of this mytery ??

Thanks for all help.

PS : The same test on a PC on XP pro + LV6.1 and Linux RedHat + LV7.1 give the same performances on the 2 OS...

[David Duffey]

Are you sure that your are running LabVIEW 7.1 on RedHat, and not 7.0?

I don't have a mac to test with, but have you narrowed down the area in loss of performance? Do you think it is in your G code, or the overhead of using a CIN?

Do you think you could create a small demo VI that demonstrates the behavior, and then we might be able to find out why.

[Olivier-JOURDAN]

Of course it's LV7.O + RedHat 9, sorry...

I haven't narrowed down the area in loss of performance :
- profile VI --> approximativly the same result on OS9 than on OSX.
- small VI test on part of code --> performances are egual or better with LV7 on OSX !!!
- modification of the excution thread or/and priority --> not conclusive. (On RedHat, this modification is radical for the increased of the performance !!)
- compiling the CIN with speed optimization --> not conclusive...
-...

The last thing I think, it's that run OSX is more expensive in CPU time than OS9... Is it possible? how test it?
I hope this is not a problem like this, because I can't optimized it !!!