Commits on Sep 29, 2015

1. Removed inappropriate use of SerialTaskQueue from ClusterShapeLazyGetter …

   A SerialTaskQueue was added to ClusterShapeLazyGetter in an attempt
   to make it thread safe. Unfortunately, the implementation was safe
   since the internals of SiPixelClusterShapeCache could be changed
   while another thread was reading the data outside of the queue.
   In addition, performance measurements done using VTune showed
   the fequent calls to SerialTaskQueue were causing a heavy CPU load
   when run with 8 threads.
   The thread safety of SiPixelClusterShapeCache will have to be handled
   in a different way in the future once we start using more than one
   thread per Event.

   

   Dr15Jones committed Sep 29, 2015
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