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hll-err.rb: speedup using pipelining.

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This commit is contained in:
antirez 2014-03-28 22:25:26 +01:00
parent f29123364b
commit fdf81b2d35
1 changed files with 16 additions and 10 deletions
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26
utils/hyperloglog/hll-err.rb
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@ -9,13 +9,19 @@ require 'digest/sha1'
r = Redis.new
r.del('hll')
(1..1000000000).each{|i|
ele = Digest::SHA1.hexdigest(i.to_s)
r.hlladd('hll',ele)
if i != 0 && (i%10000) == 0
approx = r.hllcount('hll')
abs_err = (approx-i).abs
rel_err = 100.to_f*abs_err/i
puts "#{i} vs #{approx}: #{rel_err}%"
end
}
i = 0
while true do
100.times {
elements = []
1000.times {
ele = Digest::SHA1.hexdigest(i.to_s)
elements << ele
i += 1
}
r.hlladd('hll',*elements)
}
approx = r.hllcount('hll')
abs_err = (approx-i).abs
rel_err = 100.to_f*abs_err/i
puts "#{i} vs #{approx}: #{rel_err}%"
end