Prroblem with analysis on Intel Xeon Phi

[H__Kamil]

Hello,

I'm trying to analyze simple serial aplication (matrix multipication) dedicated for Intel Xeon Phi coprocessor using VTune. I created native aplication, using -mmic flag and next copy it to mic0 using scp command. Next I ran analysis as shown in the link below :

https://software.intel.com/en-us/articles/how-to-analyze-xeon-phi-coprocessor-applications-using-intel-vtune-amplifier-xe-2015

Upon completion I got the following result (pic.: vtune1, vtune2). In analisys result i did not get information as shown in the link above. I obtained the same result for General Exploration. Nothing information about implemented function etc.

Could You give me some suggestion what could be wrong?

[Peter_W_Intel]

Are you using VTune(TM) Amplifier XE 2015 Update 2?

Can you run matrix application without VTune? For example,  "ssh mic0 /root/matrix.MIC"

It seemed that you application only collected data for "ssh" process, I don't know what you did on GUI. You may redo this via command line. Here is an example for your reference:

# amplxe-cl -collect advanced-hotspots --target-system=mic-native:0 --search-dir=. -- /root/matrix.MIC

Simply you can use "amplxe-cl -R hotspots" to verify the result, or use ample-gui to open result. vmlinux should NOT be the hottest function, which should be a function in matrix.  

[H__Kamil]

No I'm not using VTune Amplifier XE 2015 Update 2.

Yes, I can run my application without VTune. I tried to do it via command line but i got the same result.

I am doing following steps when I am running an analysis:

1. Copy exetubale file to mic: scp mic0:/tmp/

2. Run amplaxe-gui

3. Choose target system: Intel Xeon Phi (native)

4. Choose card number: 0(mic0)

5. Fill field Application: /tmp/matrix.mic

6. Click OK, next choose Advanced Hotsposts Analyze and start it.
 

[TimP]

You appear to be ignoring the instruction to launch your application on mic from the host side, e.g. by ssh mic0.

I guess you may be setting VTune to collect host data only.  If you are using a good older version such as amplifier xe 2013 update 17, your only choices to collect with gui on mic side are the knc specific selections.

[Peter_W_Intel]

> Yes, I can run my application without VTune. I tried to do it via command line but i got the same result.

What was command line you used, and what were outputs? 

You can verify if VTune can work on Xeon Phi, by using:

# ssh mic0 lsmod | grep sep    ; vtune driver is loaded
sep3_15                45337  0 

# amplxe-cl -c advanced-hotspots -target-system=mic-native:0 -d 5     ; data collection works, without target application.

Can you please try 2015 U2? Can you please post your result directory?

[Dmitry_P_Intel1]

Hello,

Could you please check that elapsed time that VTune reports is the same as you have for the run without VTune?

It seems that the run was pretty short - probably the app was not run correctly under VTune on the card.

Thanks & Regards, Dmitry

[H__Kamil]

> What was command line you used, and what were outputs?

 amplxe-cl -collect advanced-hotspots --target-system=mic-native:0 --search-dir=. --  /tmp/matrix.mic

> You can verify if VTune can work on Xeon Phi...

VTune work on card.
# ssh mic0 lsmod | grep sep
sep3_15                45209  0

> Can you please try 2015 U2? Can you please post your result directory?

I will update VTune, then I will try again.

> Could you please check that elapsed time that VTune reports is the same as you have for the run without VTune?

Eplased time is smaller (equal 0).

I posted my result. Aplication was analyzed via command line. It is launched during analysis. I posted my application too. Source file and Makefile are located in matrix folder.

[Peter_W_Intel]

I cannot reproduce your problem with your test case:-(

# amplxe-cl -c advanced-hotspots -target-system=mic-native:0 -search-dir=. -- /root/matrix.out

# amplxe-cl -R hotspots
amplxe: Using result path `/home/peter/tmp/matrix/r000ah'
amplxe: Executing actions 50 % Generating a report                             
Function                          Module                   CPU Time  Spin Time  Overhead Time
--------------------------------  -----------------------  --------  ---------  -------------
[vmlinux]                         vmlinux                   16.637s         0s             0s
Multipication                     matrix.out                15.377s         0s             0s
[sep3_15]                         sep3_15                    0.223s         0s             0s
memset                            libc-2.14.90.so            0.142s         0s             0s

In your result, It seemed matrix.out ran shortly and no sample for Multipication captured, only [vmlinux] had samples.

> Eplased time is smaller (equal 0).

On my side, matrix.out ran ~13s without VTune, and run ~15s with VTune. Please check.

By the way, you need to copy all contents under "/opt/intel/composer_xe_2015/lib/mic/" (for example) to mic0:/lib64 first, then app on MIC can run properly. 

[H__Kamil]

Ok, I copied this components and changed matrixes size. 

Now matrix.out ran ~ 37s without VTune and ~32s with VTune. But result are the same. Multipication function is not one the list. VTune still does not show corretly information about logical CPU count (48 instead 244). I am waiting for VTune Update 2. After update i will analyze it again.

[Peter_W_Intel]

> Now matrix.out ran ~ 37s without VTune and ~32s with VTune...

This is an expected result. Please try VTune Amplifier XE 2015 U2, if the problem persists on, attach your result directory again. Thank you. 

[H__Kamil]

Hello,

I updated my VTune to Update 2 and now it's OK. Thanks for help :)

[Dmitry_P_Intel1]

Good to hear, thank you!

Regards, Dmitry

[H__Kamil]

Hello, 

I have another question but i don't want create new topic. My VTune analyze Xeon Phi application correctly. But I would like to ask You about display the result.

I use command line to run analyze program on coprocessor. When I display result via command line I have more information about my application than when I do it via GUI eg (CPI Rate).  Why my result does not display information about CPU utilization like in hotspots analyze in CPU?

[David_A_Intel1]

Hi Kamil:

See the "viewpoints" menu at the top of the display.  Currently, you are viewing "Hardware Event Counts".  Try "Hotspots".