Re: Using bitbake in minimal chroot environment

[Martin Jansa <martin.jansa@gmail.com>]

On Mon, Feb 15, 2010 at 12:22:56PM -0600, Mike Westerhof wrote:
> So my conclusion is that I/O is not the bottleneck for my OE builds, and
> that's the only area where a VM is significantly different in terms of
> performance (at least how I use VMs; perhaps other builds may observe
> differences).

Interesting!

out of curiosity, how many threads were you using for that test? 
I'm using:
PARALLEL_MAKE="-j4"
BB_NUMBER_THREADS = "2"
for builds with my 1x AMD Phenom workstation at home and I would expect
even more I/O with more concurrent threads.

I didn't perform any sophisticated benchmark, but when I was using tmpfs
I compared build times with genlop/qlop gentoo utility which shows
history of all performed builds with time it used. So I've seen
significant speedup when switched from single-drive to tmpfs, then not
so significant slowdown when switched from tmpfs to raid0. But then I
didn't recheck diff between single-drive builds and raid0 (because
versions built were usually quite different)

Kind regards,

-- 
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Jansa Martin                 sip:jamasip@voip.wengo.fr 
JaMa