On 12/10/12 12:43, Samuel Stirtzel wrote:
Hi,
after re-building Qt the third time today, I was curious why
do_package takes this long.
From my investigation it looks like the library stripping is the culprit,
it lets my system idle with 5% CPU usage over a long time.
Would it be possible to accelerate do_package with parallelisation?
Likely I could look into this sometime soon, but I'd rather hear your
thoughts on this first.
PS:
Also sstate creation and rootfs packing could be made faster with
pbzip2 [1] / pigz [2] (we have a recipe for pigz), or is anthing
preventing this?
[1] http://compression.ca/pbzip2/
[2] http://zlib.net/pigz/
Samuel,
You being up an interesting point here as I have recently been mulling
over ways of improving performance. I believe performance improvements
are one of the targets of the 1.4 yocto/oe-core release so it will be
properly discussed then.
In the meantime a couple of points I was thinking about related to
improving performance was by deeming some tasks as "non active" such as
they didn't take up a thread of your total specified. This could be
applied to low-cpu intensive tasks such as do_fetch and do_package which
I believe would greatly speed up the build and make more efficient use
of the CPU.
As for using pbzip2/pigz I believe there was a discussion on it and
something was said regarding the compatibility of the created archives.
For example an archive created by pigz could sometimes not be
uncompressed by gzip, I am just remembering this from memory though, I'm
sure a search of the list would be more enlightening.
Regards,
--
Jack Mitchell ([email protected])
Embedded Systems Engineer
http://www.embed.me.uk
--
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