[hwloc-devel] lstopo - please add the information about the kernel to the graphical output

[Jiri Hladky]

Hi Brice,
hi all,

I do run hwloc on different versions of Linux kernel when testing RHEL.
Since sometimes kernel is buggy and does not detect the topology correctly
it would be useful to have at the bottom of the graphical output of the
lstopo not only host name but also the version of the kernel.

Example of C code on Linux to write this info:
===============================================
#include <sys/utsname.h>
        if(uname(&uname_buf) == -1)
            printf("uname call failed!");
        else {
            printf("Nodename:\t%s\n", uname_buf.nodename);
            printf("Sysname:\t%s\n", uname_buf.sysname);
            printf("Release:\t%s\n", uname_buf.release);
            printf("Version:\t%s\n", uname_buf.version);
            printf("Machine:\t%s\n", uname_buf.machine);
       }

Nodename:       localhost.localdomain
Sysname:        Linux
Release:        3.10.7-100.fc18.x86_64
Version:        #1 SMP Thu Aug 15 22:21:29 UTC 2013
Machine:        x86_64
===============================================


Suggestion: on the graphical output of lstopo please add the line

System: Linux, x86_64, 3.10.7-100.fc18.x86_64 #1 SMP Thu Aug 15 22:21:29
UTC 2013


printf("System: %s, %s, %s %s\n", uname_buf.sysname, uname_buf.machine,
uname_buf.release, uname_buf.version);

Would it be possible? Any further ideas, suggestions?

Thanks a lot!
Jirka

On Tue, Jun 18, 2013 at 5:17 PM, Jiri Hladky <hladky.j...@gmail.com> wrote:

> Hi Brice,
>
> we test linux kernel job scheduler. To do so, we run for example
>
> 1
> 2
> ....
> 16
> 32 linpack benchmarks simultaneously.
> (upto the number of cores)
>
> For each group of jobs we have this output:
>
> =======2 simultaneous jobs========
> PID #CPU #CPU #CPU #CPU
> PID #CPU #CPU #CPU
> ==============================
>
> where first column is PID of linpack benchmark and other columns is CPU on
> which the process was running with granularity of 1 second
>
> I would like to check the possibilities to visualize the results to the
> output similar to lstopo --top (see the attachment). I would like to write
> a simple utility which will
>  * parse the above file
>  * foreach timestep create an output similar to lstopo --top output
> showing, where each job was running
>
> How difficult would be this? Could you please provide some hints what API
> functionality to use?
>
> Thanks!
> Jirka
>
>