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hll-err.rb: speedup using pipelining.

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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 = Redis.new
r.del('hll') r.del('hll')
(1..1000000000).each{|i| i = 0
ele = Digest::SHA1.hexdigest(i.to_s) while true do
r.hlladd('hll',ele) 100.times {
if i != 0 && (i%10000) == 0 elements = []
approx = r.hllcount('hll') 1000.times {
abs_err = (approx-i).abs ele = Digest::SHA1.hexdigest(i.to_s)
rel_err = 100.to_f*abs_err/i elements << ele
puts "#{i} vs #{approx}: #{rel_err}%" i += 1
end }
} 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