Striking

Our project: Debugging Threads in Intel Parallel Studio

Group Members

Eunju Han [1] Research etc.
Lei(Eric) Zhang [2] (Dropped the course) Research etc.

Progress

Oct 17th:

Picked topic
Picked presentation date.

Oct 20th:

Created Wiki page

Nov 6th - 13th:

There are great resources about Intel Parallel Debugger Extension for Microsoft Visual Studio like below.

Debugging Threads in Intel Parallel Studio - [Dr. Dobbs Article]
Intel® Parallel Debugger Extension, Added Aug 2, 2012 - [[3]]
Intel Parallel Composer Parallel Debugger Extension Tutorial - [Mittie Sylvian's Video]

However, Intel Parallel Debugger Extension has been deprecated from the version Intel Composer XE 2013 at the end of 2012. I have noticed this from the Intel User Forum.

Intel Parallel Debugger Extension has been deprecated?

Nov 14th - 23th:

Links about Debug Multithreaded Applications in Visual Studio

alt text
Callout Letter	Element Name	Description
A	Call Stack Segment or Node	Contains a series of method contexts for one or more threads.
B	Blue Highlight	Present the call path of the current thread.
C	Arrow lines	Connect nodes to make up the entire call path for the thread(s).
D	Tooltip on Node Header	Shows the ID and user-defined name of each thread whose call path shares this node.
E	Method Context	Represents one or more stack frames in the same method.

Sample code to use debugging

Sample code can be downloaded from here Intel(R) Cilk(TM) quick sort

- Data flow of parallel_qsort

alt dataflow

Explanation will be here soon.

- Parallel Stacks

alt qsort_set1	alt qsort_set2
Recursive calling parallel_qsort of spawning parallel_qsort in the first parallel_qsort function which main thread has responsible for	The moment right after a spawning thread works in second parallel_qsort calling which Main Thread had finished
alt qsort_set4_1	alt qsort_set4_done
For two level parallel_qsort function calling and two level spawning call to parallel_qsort, two Threads are working for this; Worker3 and Worker2	The moment that Main Thread is working for getting out of the previous spawning thread calling to parallel_qsort and 3d and 4th element values in the data array are exchanging in memory.