HENDERSON MIKE, MR wrote:
Another data point:HP BL-20 blade, two 'HYPErthreading' Intel Xeon CPUs (looks like 4 CPUs to O/S)
...
On this hardware and O/S, multi-threading sort is neither significantly faster nor significantly slower than non-multi-threading?
One other test you might want to try is running the sort both ways with hyperthreading turned off in the BIOS. I read an article last fall about how Intel's hyperthreading significantly degrades the performance of MS SQL Server, and it makes sense that other databases would also suffer. The problem is the result of two threads sharing single L1 and L2 CPU caches. If the threads are owned by completely different processes, chances are they'll be throwing out the entire cache with every clock cycle. Essentially like having no cache at all. Here's the article:
http://news.com.com/Does+hyperthreading+hurt+server+performance/2100-1006_3-5965435.html -John -- John Hester System & Network Administrator Momentum Group Inc. (949) 833-8886 x623 http://memosamples.com ------- u2-users mailing list [email protected] To unsubscribe please visit http://listserver.u2ug.org/
