taskq and update times

We have taken a look at the cache update time when using the taskq pragma in the code.
There was a slight decrease in the average update time, 7 milliseconds to 4 milliseconds. However, the worst case for update time increased greatly. The original code had a worst case of the update time around 5-6 seconds, the taskq code had worst cases around 40 seconds with two threads and 50 seconds with 4 threads.

The results are not good. We will try again once we get the hypercuts structure working with the code and see if there is any difference then.