Hello friends, My friend Lumi from Art For All experiencing a weird HyperThreading problem with Vue 5 Inifinite. Maybe you can help us out... "Vue supports Multi-processor rendering on multi-processor OS. I use WinXP Pro with an Intel hyperthreading CPU. My Problem: Vue stops to work, in different situations. No crash. Only frozen programm. In this case, i deselect the second CPU in taskmanager. After this Vue is working fine. Does somebody know this problem?" Thanks for taking time to read - happy 2006 to everyone... :)

Hyper threading isnt actually a multiple CPU, so maybe Vue doesn't get a long with it.

Sorry, but I'm a bit confused with "I deselect the second CPU in taskmanager". How are you doing that? Are you saying, you are dissabling HT from Task Manager? Cheers

In task manager/processes select the offending app & right click, then select affinity.

This problem is new to me. I ran both Vue 4.54 Pro and Vue5I on a P4 2.8 HTT. Vue reported and used 2 CPUs. I had regular crashes, but they were not due to HTT problems. By the way, when I disabled HTT in the BIOS setup, renders were a tad faster than with HTT.

Your problem sounds like the "real" and "virtual" CPUs (which make up the two processors in an HT system) are competing for system cache. With a dual cpu (or dual core) each processor has its own cache, but with Hyper-Threading the "real" and "virtual" CPU's have to share the same cache. If the real and virtual CPUs need different data then the HT processor can spend a lot of time moving data in and out of cache (depending on cache size) rather than doing any actual work, which results in longer render times or apparant lock ups. This is one of the reasons why turning off HT can sometimes improve performance.