On 08/09/2011 02:47 PM, Christian Robottom Reis wrote:
On Thu, Aug 04, 2011 at 12:03:00PM -0700, Taras Glek wrote:
Recently we have been looking at how to squeeze more performance out
of our toolchain for building Firefox on Android. Mike Hommey
integrated GCC 4.6 into the android NDK and has been testing
performance (with mixed results
http://gcc.gnu.org/ml/gcc/2011-08/msg00096.html).
You should definitely be trying to build using the Linaro 4.5 and 4.6
compiler branches; they are pretty much guaranteed to give you better
performance, and if they don't, we're on the hook to fix it quickly! All
the patches go upstream, so there is no risk of you being stuck on a
fork -- it just makes everything you need available right now.
Mike, can you give these a try?
I'm copying the linaro-toolchain list to make sure that you get the
right people's attention (though if they weren't all coming back from
Connect in Cambridge this week they would have picked the email up
already).
I like how Linaro is doing regular arm benchmarking, ie
https://wiki.linaro.org/Platform/Android/AndroidToolchainBenchmarking/2011-07
We do much more than that, but it's not as easy to find right now; for
instance http://ex.seabright.co.nz/helpers/benchcompare is Michael's
regular release benchmark.
Link gives me an error page
. Would you be interested in adding a Firefox-based benchmark? As a
large application it is a good testbed for LTO, FDO and other
aggressive optimizations.
Totally. Let's do it. Can you give me an idea of what boards you are
testing the build on today? Do you have a test suite that we could run
in a reasonable timeframe (hours, not days)?
We have various benchmarks, all of which run within 30-60min.
We are also looking at setting a developer-friendly android ROM with
oprofile, perf, systemtap, gdb, debug symbols, etc. It might even be
beneficial for us to use newer kernels as we exlore options like
kernel-assisted ld.so relocations, etc. That seems to similar to
what Linaro provides in the evaluation ROMS. Is there any chance of
Linaro providing developer-friendly "evaluation" ROMs for retail
phones like the Nexus S?
It's indeed pretty similar (we just call them LEBs), and Zach will be
really interested in working with you on this.
As for supporting actual released phones, it lies somewhat outside of
our optimal operating model, and we don't have any hardware available. I
guess we could do a spin for a specific model if we had enough of them
to use by a set of engineers in the different teams. They are so
expensive, though. Do you guys have lots of them?
How many devices would you need?
We actually have two separate needs. We use developer boards for
continuous integration and phones for development. We need a good
quality rom for both. Perhaps we can switch our boards over to pandaboards.
Is there someone I can call(and what time) to discuss this further?
Taras
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