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Questions about multithreaded cblas functions

I am having trouble getting cblas functions from the Accelerate framework to multithread in Cocoa apps that are running on multicore G5 machines (specifically: cblas_zgeru, cblas_zgemv, and cblas_daxpy).  There seems to be only a single thread spawned by the compute thread of my app, as monitored by "Shark" and "Activity Monitor."   

Can all cblas routines run multithreaded on multi-core PPC and Intel processors?  If not, is the subset of functions that are multithreaded documented somewhere?  

To ensure that the environment variable is set to permit multithreading, I have added the following entry to the Info.plist file of my Cocoa apps:

        <key>LSEnvironment</key>
        <array>
            <dict>
                <key>VECLIB_MAXIMUM_THREADS</key>
                <string>4</string>
            </dict>
        </array>

Is this correct?  Thanks.  
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