Hi Chris,

I'm here with Victor and we've been looking at flags and things.  One
of the things I'm seeing is that you get the most significant change
when adding armv6.  I think the situation is that we're supporting
armv5 and armv7, with armv5 using software floating point.  With the
flags you're setting, I wondering if your processor has a hardware
floating point unit that gets enabled with your flags. With the
current build, for your processor, my guess is that the armv5 would
get picked up to use.

I'm trying some build things now, trying -ffast-math.  One thing to
note, I'm logging the builds by add "V=1" to the last line of the
build.sh, the calling "./build.sh &> output.txt" to capture the
complete builds.  A number of the flags mentioned are already set or
are set via the optimization flags.

Thanks for reporting this though, it'll hopefully help to find some
interesting ways to optimize!

steven


On Thu, Oct 11, 2012 at 3:08 PM, c.m.bryan  wrote:
> Hi everyone, in the interest of trying to contribute something rather than
> just asking questions, here is some benchmark data that I gathered while
> messing with C compiler flags, both for the csoundandroid library and
> linsndfile. The orchestra instrument simply reads in audio from the sdcard,
> runs it through pvanal, and writes the output to the app's data folder.
>
> The results seemed to vary quite a lot on multiple runs, I suppose because
> of whatever else Android is doing in the background, and I don't know how to
> control this. Anyway, I ran each test several times and picked the best,
> assuming that to be the most accurate. As you can see, I had some success
> which seems to be related to the floating-point optimizations and the
> "release" setting in Application.mk.
>
> Any suggestions, recommendations, etc. are most welcome!
>
> -Chris Bryan
>
>
> Results
> =======
> Default compile from git
> (pulled on 10/10/12):     60.543
>
> Compiled to arm code:     [compiles, but does not run]
>
> += -ffast-math            67.324
>
> += -mfloat-abi=softfp
> -mfpu=vfp
> -fno-strict-aliasing      61.923
>
> += -march=armv6 -marm
> -mfloat-abi=softfp
> -mfpu=vfp
> -fno-strict-aliasing      35.793
>
> += -march=armv6 -marm
> -mfloat-abi=softfp
> -mfpu=vfp
> -fno-strict-aliasing
> (and added
> "APP_OPTIM := release"
> to Application.mk):       33.642
>
> += -ffast-math
> -march=armv6 -marm
> -mfloat-abi=softfp
> -mfpu=vfp
> (and added
> "APP_OPTIM := release"
> to Application.mk):       30.511
>
> += -ffast-math
> -march=armv6 -marm
> -mfloat-abi=softfp
> -mfpu=vfp
> -fno-strict-aliasing
> (and added
> "APP_OPTIM := release"
> to Application.mk):       31.060
>
> += -ffast-math
> -mfloat-abi=softfp
> -mfpu=vfp
> -fno-strict-aliasing
> (and added
> "APP_OPTIM := release"
> to Application.mk):       31.060
>
>
> Hardware ('cat /proc/cpuinfo'):
> ========
> Processor : ARMv6-compatible processor rev 5 (v6l)
> BogoMIPS : 805.93
> Features : swp half thumb fastmult vfp edsp java
> CPU implementer : 0x41
> CPU architecture: 6TEJ
> CPU variant : 0x1
> CPU part : 0xb36
> CPU revision : 5
>
> Input
> =====
> "noise.wav", 60s of stereo white noise.
>
> .csd
> ====
> 
> 
> -n
> 
> 
>
> sr = 44100
> ksmps = 128
> nchnls = 2
> 0dbfs = 1
>
> instr 1
> ifftsize = 4096
> iwtype = 1
> kwidth = 1
>
> al,ar soundin p4
>
> fl pvsanal al, ifftsize, ifftsize/4, ifftsize, iwtype
> fr pvsanal ar, ifftsize, ifftsize/4, ifftsize, iwtype
>
> pvsfwrite fl,"/data/data/com.cmbryan.android.pvanaltest/left.pvx"
> pvsfwrite fr,"/data/data/com.cmbryan.android.pvanaltest/right.pvx"
> endin
>
> 
> 
> i1 0 30 "/sdcard/noise.wav"
> 
>
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