Thu, November 29, 2007, 03:01 PM under dotNET
If you watched my videos here
, please note the following clarifications:
First, in all videos I am using the old internal sort-of-a codename "PFX". This is no longer used internally or externally. Instead just refer to it as Parallel Extensions.
Second, in the PLINQ video
, when I very briefly mention what pipelining does, my description is outdated; for an up to date description of pipelining please see this
. Also in the same video I do not make it clear that the
option will *not* allow you to preserve ordering.
Third, in the Parallel video
, where I use
and imply that it is the same as
, I am obviously wrong: The issue is that it’s possible for the first thread to complete so fast that the second thread doesn’t have any work to process. The first thread will store its partial result back into the total sum, but since the thread local selector delegate has captured that total sum variable, the second thread will be initializing its partial sum with the total sum that already includes the first sum’s partial. Thus, you could end up counting values twice so you should use
instead. In the same video, if you really wanted to simulate
, in the parallel version you would have to add a
statement after the
statement that I used.