col test

output.txt

elapsed time: 0.004460344 seconds (245720 bytes allocated)
elapsed time: 0.003603252 seconds (231920 bytes allocated)

source.jl

function collatz_branch(N::Integer)
  i = 0
  while N > 1
    N = iseven(N) ? div(N,2) : 3N+1
    i += 1
  end
  return i
end

function collatz_select(N::Integer)
  i = 0
  while N > 1
    N = ifelse(iseven(N), div(N,2), 3N+1)
    i += 1
  end
  return i
end

test_branch(Ns::Vector{Int}) =  map(collatz_branch, Ns)
test_select(Ns::Vector{Int}) =  map(collatz_select, Ns)

gc_disable()

test_branch([1:10])
test_select([1:10])

const N = (length(ARGS) > 0 ? int(ARGS[1]) : 10000)
const Ns = [1:N]

@time test_branch(Ns)
@time test_select(Ns)

system_info.txt

Julia Version 0.3.3
Commit b24213b (2014-11-23 20:19 UTC)
Platform Info:
  System: Linux (x86_64-linux-gnu)
  CPU: Intel Xeon E312xx (Sandy Bridge)
  WORD_SIZE: 64
           Ubuntu 12.04.5 LTS
  uname: Linux 3.2.0-70-generic #105-Ubuntu SMP Wed Sep 24 19:49:16 UTC 2014 x86_64 x86_64
Memory: 0.9721298217773438 GB (69.33984375 MB free)
Uptime: 2.462893e6 sec
Load Avg:  0.150390625  0.046875  0.05517578125
Intel Xeon E312xx (Sandy Bridge): 
       speed         user         nice          sys         idle          irq
#1  2499 MHz    8487027 s       4690 s    1901708 s  234493053 s        468 s
#2  2499 MHz    7127917 s        221 s    1854561 s  236684301 s          0 s

  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Sandybridge)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3
Environment:
  JENKINS_HOME = /var/lib/jenkins
  LD_LIBRARY_PATH = /usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64/server:/usr/lib/jvm/java-6-openjdk-amd64/jre/lib/amd64:/usr/lib/jvm/java-6-openjdk-amd64/jre/../lib/amd64
  HOME = /var/lib/jenkins
  TERM = screen
  HUDSON_HOME = /var/lib/jenkins
  PATH = /usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games

Package Directory: /var/lib/jenkins/.julia/v0.3
No packages installed