[sugar] rendering test

[Tomeu Vizoso]

On Sun, Sep 28, 2008 at 8:57 PM, Bernie Innocenti <bernie at codewiz.org> wrote:
> Riccardo Lucchese wrote:
>>
>> I haven't tried to run oprofile on the xo yet (it is on my todo list).
>
> Be careful, there's a catch with jffs2: it does not support the writable
> shared mmap that oprofiled needs.  This leads to a confusing situation where
> you get an empty report file without any error given.
>
> Refer to this (possibly outdated) documentation for an easy workaround:
>  http://wiki.laptop.org/go/Oprofile_setup
>
>
>> If I remember well, ExaDoMoveOutPixmap (or a function with a similar
>> name) and memcpy were always on top of sysprof profiles in rendering
>> tests.
>
> One advantage of repeating the profile now would be comparing the absolute
> times between different X servers and Fedora runtimes.
>
> Also, leaf functions tell us very little.  memcpy() might be called from
> many different places to do different things.  oprofile also supports stack
> traces, but for some reason I could never get them to work on the XO.  One
> clue is that oprofile cannot use the NMI interrupt on the XO and falls back
> to using a software timer instead.  Perhaps the stack tracing code doesn't
> like that.

In that case, maybe sysprof is just enough (and much easier to set up).

Regards,

Tomeu