topic I believe that the analyzer in Software Archive

How to use VTune with ssh public key?

Sunwoo_L_ — Sun, 02 Aug 2015 18:18:08 GMT

Hello.

My system forces users to use public key to access to not only the host system but also its coprocessors. I just want to collect some performance data from the Xeon Phi. (My application works in native mode.) So I ran the VTune tool with a command like the below.

amplxe-cl -collect knc-lightweight-hotspots -result-dir ./analysis -target-system=mic-native -- ssh -i ~/.ssh/id_rsa_phi root@mic0 "application.out"

But I just got the permission denied errors.

amplxe: Error: Permission denied (publickey,password,keyboard-interactive).
amplxe: Error: Amplifier cannot detect Intel Xeon Phi coprocessor configuration.

Is anyone familiar with this kind of permission issues? How am I supposed to run the VTune in command line mode at the system which forces secure connection?

I believe that the analyzer

Sumedh_N_Intel — Wed, 05 Aug 2015 17:31:49 GMT

I believe that the analyzer uses the default key (id_rsa) when it tries to connect to the coprocessor. Is there a reason why you have a separate RSA key for the coprocessor? Would it be possible to use the default key in your case?

Also, your command line is incorrect. When you specify the target system as mic-native, you no longer need to explicitly ssh to the coprocessor. The correct command line would be:

amplxe-cl -c advanced-hotspots -target-system=mic-native -result-dir ./analysis -- <path-to-app-on-coprocessor>/application.out

I hope this helps.

Thank you, Sumedh Naik.

Sunwoo_L_ — Fri, 07 Aug 2015 15:34:27 GMT

Thank you, Sumedh Naik.

I will ask the system administrator about using the default key. Also I figured out that the command line was incorrect right after I wrote the question. Thank you again.

Just in case - if you still

Dmitry_P_Intel1 — Fri, 21 Aug 2015 09:35:34 GMT

Just in case - if you still need to run ssh manually from the host by some reason to profile on mic then you can use the following syntax:

>amplxe-cl -collect advanced-hotspots -result-dir ./analysis -target-system=mic-host-launch -- ssh -i ~/.ssh/id_rsa_phi root@mic0:/my_dir/application.out

But in this case you will need to point search directories on the host for VTune for the modules of interest to have them resolved adding -search-dir my_dir_on_the_host_where_target_binaries_reside

Thanks & Regards, Dmitry