Ftrace collection cannot be enabled

[mnt]

Hi

Using vtune web interface on DevCloud, when I enable "Collect C-State events", I get the following error:

Ftrace collection cannot be enabled.

The node that I am using has Xeon(R) Gold 6128 CPU.  How can I fix that?

[RemyaP_Intel]

Hi,

Thank you for posting in Intel Communities.

Could you please let us know  

 - The analysis type you are trying to run in Vtune.

 - Vtune version

 - A sample reproducer of the input.

 - Additional settings(if any) to reproduce the issue

Note: Below are the available analysis types in VTune

performance-snapshot

hotspots

anomaly-detection

memory-consumption

uarch-exploration

memory-access

threading

hpc-performance

io

gpu-offload

gpu-hotspots

fpga-interaction

system-overview

graphics-rendering

platform-profiler

tsx-exploration

tsx-hotspots

sgx-hotspots

hotspots-0

hotspots-1

[mnt]

Hello,

As I said that problem exists on DevCloud. Now I am using my own Linux system and see the same error. So, let me explain what is my configuration.

I followed the steps here to change the ownership of /sys/kernel/debug/tracing

$ sudo chown -R mahmood:vtune /sys/kernel/debug/tracing
$ sudo ls -l /sys/kernel/debug/
total 0
...
drwxr-xr-x  2 root    root  0 Mar 14 13:09 sync
drwx------  8 mahmood vtune 0 Mar 14 13:09 tracing
drwxr-xr-x  2 root    root  0 Mar 14 13:09 ttm
...
$ groups
mahmood adm cdrom sudo dip plugdev lpadmin lxd sambashare libvirt vtune
$ whoami 
mahmood

So, all are set.

But as you can see below, when I launch vtune and enable "Collect C-State events", I still get the same error.

I would like to test the matrix multiplication example and the CPU is Intel(R) Core(TM) i5-6600.

[RemyaP_Intel]

Hi,

We are unable to reproduce the issue from our end. Could you please share with us the exact steps you have followed. Let us know how you enabled the collect c-state event.

--

Regards,

Remya Premdas

[RemyaP_Intel]

Hi,

We haven't received any response from your end. Is your issue resolved?

Regards,

Remya Premdas

[mnt · Accepted solution]

Hello,

Sorry for not updating the topic. In fact, the error was due to incorrect user group assignment. The problem is now solved. Thanks.

[RemyaP_Intel]

Hi,

Glad to know that your issue is resolved. If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

Regards,

Remya Premdas