diff options
| author | k0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-07-10 13:05:29 +0000 |
|---|---|---|
| committer | k0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-07-10 13:05:29 +0000 |
| commit | 8068d34cfe4f74784cba29e981e2d8437ff02a9f (patch) | |
| tree | 85b1f81c676f3fecdf3c425a94f341f63797eec4 /benchmark/bm_so_nsieve.rb | |
| parent | bd12037e50a216bda5896676b678bafee5eacb49 (diff) | |
Revert "benchmark/*.yml: convert from benchmark/bm_*.rb"
This reverts r63900.
Having single-execution benchmark as a normal Ruby script is preferred
by ko1. I'm not a big fan of having inconsistent benchmark formats, but
I can understand some benefits of it.
common.mk: remove obsolsted benchmark-each PHONY declaration, support
running Ruby scripts added by this commit.
README.md: follow ARGS change
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63926 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'benchmark/bm_so_nsieve.rb')
| -rw-r--r-- | benchmark/bm_so_nsieve.rb | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/benchmark/bm_so_nsieve.rb b/benchmark/bm_so_nsieve.rb new file mode 100644 index 0000000000..a65cc78233 --- /dev/null +++ b/benchmark/bm_so_nsieve.rb @@ -0,0 +1,35 @@ +# The Computer Language Shootout +# http://shootout.alioth.debian.org/ +# +# contributed by Glenn Parker, March 2005 +# modified by Evan Phoenix, Sept 2006 + +def sieve(m) + flags = Flags.dup[0,m] + count = 0 + pmax = m - 1 + p = 2 + while p <= pmax + unless flags[p].zero? + count += 1 + mult = p + while mult <= pmax + flags[mult] = 0 + mult += p + end + end + p += 1 + end + count +end + +n = 9 # (ARGV[0] || 2).to_i +Flags = ("\x1" * ( 2 ** n * 10_000)).unpack("c*") + +n.downto(n-2) do |exponent| + break if exponent < 0 + m = (1 << exponent) * 10_000 + # m = (2 ** exponent) * 10_000 + count = sieve(m) + printf "Primes up to %8d %8d\n", m, count +end |