3.5.1 on Mac OS X 10.6: no more virtual clusters?

Prior to 10.6 and 3.5.1, I set up virtual clusters with as many instances as I had cores on my MacPro. And this worked great. My H.264 files rendered so much faster with the 8 instance than rendering to the single instance "My Computer" method and it was amazing.
Now with 10.6 and 3.5.1 and with the same 8 instance cluster setting the machine totally chokes. The UI gets really really slow and I tried it with even only 6 instances selected. Is this because 10.6 can utilize multi-cores much more efficiently on the OS level where we don't need to use all those instances in qmaster anymore?
Wanted to see if anyone else noticed this.
Thanks!

HI Jamie just a thought.. are your rendering or TRANSCODING here? try to resolve this by:
• making sure that each instance of COMPRESSOR (from qmaster) is not using a load of REAL MEMORY.
• look for MALLOC errors in the /var/log relating to other apps failures
• avoid any paging/swapping (see activity monitor)
For example if you use COMPRESSOR.app under qmaster for rendering out say MOTION projects (as you do).. it uses the TRANSCODING engines for this apparently.... , you will find that due to motion.apps resource setup that it will use a tonne of REAL MEMORY for all its OBJECTS, and this again for each INSTANCE of the COMPRESSOR task.
YOu can easily see this REAL MEMARY (not virtual) usage in the /utilities/activity monitor.app
SUrprisingly all my 12GB of RAM was swamped by some MOTION projects and I had to back the qmaster tasks instances on this machine to only 6 when I had in fact up to 16 available!. In this case each motion instances wanted 1.4GB of REAL MEMORY .. do the maths is easy.
The slow down can easily be determined if you have a great deal I/O for paging and swapping. You can see that again in the graphic display in the activity monitor. This will grind you system to a snails pace if it does.
SO you need to be either conservative wit the use of virtual clusters or set you batches up in blocks with manual tweaking of the instance numbers for compressor.
I believe the "algorithm" implementation (according to forums) of the 3.5 version of compressor/qmaster has been improved to utilise the cores better for SEGMENTED work.
Summary: I'd start looking here (regardless of use of motion or not) and see if it is a REAL MEMORY over use. YOu wanna leave at least 500MB available else you will start causing crippling slowdowns while OSX pages Virtual memory in and out of the startup disk.
start here I think and look in the /var/logs (console.app) for errors.
hth
w

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