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== Group Members ==
#Eunju Han [mailto:ejhan4@myseneca.ca?subject=GPU621%20from%20CDOT%20Wiki] Research etcand Demo.#<nowiki>Lei(Eric) Zhang </nowiki> [mailto:lzhang216@myseneca.ca?subject=GPU621%20from%20CDOT%20Wiki] Research etc. (Dropped '''He dropped the course.''') Research etc.
== Progress ==
*[https://software.intel.com/en-us/forums/debug-solutions/topic/515990 Intel Parallel Debugger Extension has been deprecated?]
While I studied this Intel Parallel Debugger Extension, I needed to learn more about Parallel Studio version. Links about Intel® Parallel Studio XE 2017 #[https://software.intel.com/en-us/intel-parallel-studio-xe link1 Intel® Parallel Studio XE 2017]#[http://www.adeptscience.co.uk/products/cpp/intel-parallel-studio-xe link2 Intel® Parallel Studio XE 2017]#[https://software.intel.com/en-us/articles/intel-parallel-studio-xe-release-notes link Intel® Parallel Studio XE Release Notes] ----'''Nov 14th - 23th17th:'''
*Links about Debug Multithreaded Applications in Visual Studio
**Main features descriptions in Parallel Stacks window
<table>
<tr><td colspan="3">[[File:Parallel_stack_view.png|500px|thumb|left|alt textThreads View from MSDN]]</td></tr>
<tr><td>Callout Letter</td><td>Element Name</td><td>Description</td></tr>
<tr><td>A</td><td>Call Stack Segment or Node</td><td>Contains a series of method contexts for one or more threads. </td></tr>
</table>
----'''Nov 18th - 23th:'''
'''Sample code to use debugging'''
The debugging example below is used for five odd numbers to be sorted. This is the easiest way to figured out how the threads work together with the simple data.
<table border="0" width="800">
<tr>
<td width="360" align="top">
*How to start debugging
# put breakpoints where you want to take a look by hitting the key F9 in the line or left-click at the front of a line
# Run the program in Debug mode by hitting the green button (or key F5)
# Go to the menu Debug -> Windows to open the windows you need( see the image on your right)
# Choose the windows that you need (e.g. Memory, Threads, Parallel Stacks, Local or Auto and so on.)
# Hit the function keys to run a program:
## F10 to run codes line by line (Step Over)
## F11 to go into a subroutine (Step Into)
## Shit +F11 to get out of a subroutine (Step Out)
## F9 to put/remove breakpoints in a line
</td>
<td width="440">
To open windows you need for debugging on Visual Studio, You must run a program in debug mode first. Otherwise, there is no menu to open the windows.
[[File:debug_windows.png|440px|thumb|left|Menu Debug > Windows on VS 2015]]
</td>
</tr>
</table>
*Sample code results
**Data flow of parallel_qsort
<table border="0" width="800">
<tr align="left"><td>[[File:dataflow.png|250px220px|thumb|left|alt Quick sorting dataflow]]</td><td>Explanation Fist set of this quick sorting is that main thread worked for first half of all elements which starts *begin 9 to *end 1. The *mid value was 9 so it swapped *mid for *end. Since mid moved to end, the second half of all elements was the end to the end which only end value are to be sorted; the actual process will be here soonskipped so no value is changed. Next set of this is that second element(its value 3) to the last element (its value 9). The *mid value was 9 and swapping it for the *end which was same as before. For the set 4-1 step, two Threads are working for this; Worker3 and Worker2 for two level parallel_qsort function calling and two level spawning call to parallel_qsort; values are already sorted so there was no swapping. As you see the rest of the major steps indicated in the data flows diagram. </td></tr>
</table>
**Parallel Stacks
<table border="0" width="800">
<tr><td width="400">[[File:qsort_set1.png|350px|thumb|left|alt qsort_set1]]</td><td width="400">[[File:qsort_set2.png|400px|thumb|left|alt qsort_set2]]</td></tr>
<tr><td>Recursive calling parallel_qsort of spawning parallel_qsort in the first parallel_qsort function which main thread has responsible for</td>
<td>The moment right after a spawning thread works in second parallel_qsort calling which Main Thread had finished</td></tr>
<tr><td>[[File:qsort_set3_done.png|400px|thumb|left|alt qsort_set3_done]]</td><td>[[File:qsort_set4_1.png|350px|thumb|left|alt qsort_set4_1]]</td>
</tr>
<tr>
</table>
----
* Tip for Parallel program debugging
The followings will be a great approach to improve your debugging experience.
First of all, doing debugging yourself is the best, not just see the videos or friend's working how to do debugging.