Re: What's taking so long??

[Joshua Lock <josh@openedhand.com>]

On Thu, 2011-01-20 at 08:11 -0700, Gary Thomas wrote:
> My target platform/distro uses IPK and I have a local kernel
> recipe which is based on the pre linux-yocto recipe that was
> used by Poky.  When I build & package the kernel, I have
> terrible performance - this is new, it used to be just fine.
> 
> Here's what I mean.  Building for my kernel and timing the
> various steps, e.g.
>    % time bitbake virtual/kernel -c compile
> 
> My kernel:
>    compile            1m49s
>    deploy             0m16s
>    populate_sysroot   0m38s
>    package           23m20s
> 
> Just to compare, using OTS Poky for BeagleBoard:
>    compile            5m07s
>    deploy             0m36s
>    populate_sysroot   0m29s
>    package            5m02s
> 
> That's a five-fold difference in the time to build & package
> the kernel.

This is a significant performance impact. Thanks for taking the time to
do some profiling.

I've filed a bug http://bugzilla.pokylinux.org/show_bug.cgi?id=666 and
we'll get someone looking into that as a matter of priority.

> 
> What am I doing [wrong?] that makes this so?
> Would it be better if I switched to RPM like the BB is using?
> 

It looks like the slow paths are in package format independent code, so
probably not.

Regards,
Joshua
-- 
Joshua Lock
        Intel Open Source Technology Centre