question on Wine using multiple CPUs

cnbiz850 · Post by **cnbiz850** » Tue Jun 28, 2011 8:29 pm

An app I run has a feature to allow the user to choose how many CPU's to use to run an optimisation procedure. My system has 8 cores. It can dual boot to Windows 7 and Ubuntu 10.10 64bits. Running the app under Windows 7 and choosing 8 CPU's for optimisation, the speed is greatly improved over using just 1 CPU. But when I use Wine (1.3.23) on Ubuntu and choose 8 CPU's, it seems even much slower than using 1 CPU. There seems to be some bottleneck (possibly due to locks for synchronisation) somewhere. This is evidenced by how the optimisation step number is reported. Instead of seeing a nearly continuous step number running through (like when using 1 CPU), I noticed with multiple CPU's, the step number jumps by the number of CPU's each time it changes after a pause in between.

How is the status of Wine handling multiple CPU's at the moment? Is the phenomenon I see a known issue of Wine in general? Or is it a specific issue of my app running with Wine?

Thunderbird · Post by **Thunderbird** » Wed Jun 29, 2011 1:21 pm

The 'wineserver' process is Wine kernel. It is a single threaded process. Depending on what your application is doing, wineserver could potentially be the bottleneck. Usually it is not a bottleneck though. Perhaps you see something interesting in top.