Re: [julia-users] Do I have simd?

[Rob J. Goedman]

On another, slightly older system, I noticed similar (approximately identical) timings for the simd.jl test script using Julia 0.5: julia> include("/Users/rob/Projects/Julia/Rob/Julia/simd.jl") Julia Version 0.5.0-dev+720 Commit 5920633* (2015-10-11 15:15 UTC) Platform Info:   System: Darwin (x86_64-apple-darwin15.0.0)   CPU: Intel(R) Core(TM) i7-3720QM CPU @ 2.60GHz   WORD_SIZE: 64   BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Sandybridge)   LAPACK: libopenblas64_   LIBM: libopenlibm   LLVM: libLLVM-3.3 First call to timeit(1000,1000): GFlop        = 0.6092165323090373 GFlop (SIMD) = 0.4607065672339039 Second call to timeit(1000,1000): GFlop        = 0.5935117884795207 GFlop (SIMD) = 0.42286883095163036 On that same system Julia 0.4 (installed from the Julia site) did show improved Gflop numbers and about a 6x improvement with simd. To see if that would help with Julia 0.5, I did (in the cloned julia directory, in a terminal): git pull https://github.com/JuliaLang/julia master make -j 4 Lots of compile messages/warnings, but in the end: clang: error: linker command failed with exit code 1 (use -v to see invocation) make[3]: *** [libopenblas64_p-r0.2.15.dylib] Error 1 make[2]: *** [shared] Error 2 *** Clean the OpenBLAS build with 'make -C deps clean-openblas'. Rebuild with 'make OPENBLAS_USE_THREAD=0 if OpenBLAS had trouble linking libpthread.so, and with 'make OPENBLAS_TARGET_ARCH=NEHALEM' if there were errors building SandyBridge support. Both these options can also be used simultaneously. *** make[1]: *** [build/openblas/libopenblas64_.dylib] Error 1 make: *** [julia-deps] Error 2 I tried: brew update brew upgrade make -C deps clean-openblas make -j 4 and running the simd.jl script now shows: julia> include("/Users/rob/Projects/Julia/Rob/Julia/simd.jl") Julia Version 0.5.0-dev+1195 Commit 68667a3* (2015-11-08 21:05 UTC) Platform Info:   System: Darwin (x86_64-apple-darwin15.0.0)   CPU: Intel(R) Core(TM) i7-3720QM CPU @ 2.60GHz   WORD_SIZE: 64   BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Sandybridge)   LAPACK: libopenblas64_   LIBM: libopenlibm   LLVM: libLLVM-3.3 First call to timeit(1000,1000): GFlop        = 1.4006308441321973 GFlop (SIMD) = 13.561988458747821 Second call to timeit(1000,1000): GFlop        = 2.300048186009497 GFlop (SIMD) = 12.84397777991844 Not sure if this helps or is even the right way to remedy this. Regards, Rob

simd.jl
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On Nov 6, 2015, at 5:35 PM, Rob J. Goedman <goed...@icloud.com> wrote: Thanks Seth, That's the end of my first attempt to figure out what’s happening here. Back to the drawing board! Regards, Rob On Nov 6, 2015, at 4:53 PM, Seth <catch...@bromberger.com> wrote: Hi Rob, I built it (and openblas) myself (via git clone) since I'm testing out Cxx.jl. Xcode is Version 7.1 (7B91b). Seth. On Friday, November 6, 2015 at 3:54:04 PM UTC-8, Rob J Goedman wrote: Seth, You must have built  Julia 0.4.1-pre yourself. Did you use brew? It looks like you are on Yosemite and picked up a newer libLLVM. Which Xcode are you using? In the Julia.rb formula there is a test ENV.compiler, could it be clang is not being used?  Rob On Nov 6, 2015, at 3:01 PM, Seth <catc...@bromberger.com> wrote: For what it's worth, I'm getting julia> timeit(1000,1000) GFlop        = 2.3913033081289967 GFlop (SIMD) = 2.2694726426420293 julia> versioninfo() Julia Version 0.4.1-pre+22 Commit 669222e* (2015-11-01 00:06 UTC) Platform Info:   System: Darwin (x86_64-apple-darwin14.5.0)   CPU: Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz   WORD_SIZE: 64   BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)   LAPACK: libopenblas64_   LIBM: libopenlibm   LLVM: libLLVM-svn so it doesn't look like I'm taking advantage of simd either. :( On Friday, November 6, 2015 at 11:43:41 AM UTC-8, Rob J Goedman wrote: Hi DNF, In below versioninfo’s only libopenblas appears different. You installed using brew. The first thing I would try is to execute the steps under Common Issues listed on https://github.com/staticfloat/homebrew-julia. A bit further down on that site there is also some additional openblas related info. Rob On Nov 6, 2015, at 10:35 AM, DNF <oyv...@gmail.com> wrote: Thanks for the feedback. It seems like this is not a problem for most. If anyone has even the faintest clue where I could start looking for a solution to this, I would be grateful. Perhaps there is some software I could run that would detect hardware problems, or maybe I am missing software dependencies of some kind? What could I even google for? All my searches just seem to bring up general info about SIMD, nothing like what I'm describing. On Friday, November 6, 2015 at 12:15:47 AM UTC+1, DNF wrote: I install using homebrew from here: https://github.com/staticfloat/homebrew-julia I have limited understanding of the process, but believe there is some compilation involved. Julia Version 0.4.0 Commit 0ff703b* (2015-10-08 06:20 UTC) Platform Info:   System: Darwin (x86_64-apple-darwin13.4.0)   CPU: Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz   WORD_SIZE: 64   BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)   LAPACK: libopenblas64_   LIBM: libopenlibm   LLVM: libLLVM-3.3 Julia Version 0.4.0 Commit 0ff703b* (2015-10-08 06:20 UTC) Platform Info:   System: Darwin (x86_64-apple-darwin15.0.0)   CPU: Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz   WORD_SIZE: 64   BLAS: libopenblas (DYNAMIC_ARCH NO_AFFINITY Haswell)   LAPACK: libopenblas   LIBM: libopenlibm   LLVM: libLLVM-3.3