86 lines
1.9 KiB
Crystal
86 lines
1.9 KiB
Crystal
require "../src/cox"
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require "tallboy"
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if ARGV.empty?
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puts "Help select Pwhash ops/mem limits for your application."
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puts "Usage: #{PROGRAM_NAME} time_min [time_max] [mem_max]"
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puts "\ttime is in seconds"
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puts "\tmem is in bytes"
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exit 1
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end
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time_min = ARGV.shift?.try &.to_f || 0.1
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time_limit = if t = ARGV.shift?
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t.to_f
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else
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time_min * 4
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end
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mem_limit = (ARGV.shift?.try &.to_i || (Cox::Pwhash::MEMLIMIT_MAX)).to_u64
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pwhash = Cox::Pwhash.new
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pass = "1234"
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# data = Array(Array({UInt64, UInt64, Float64})).new
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header = [" "]
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data = [header]
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def bytes_str(b)
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suffix = if b >= 1024*1024
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b /= (1024*1024)
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"M"
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elsif b >= 1024
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b = b / 1024
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"K"
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else
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""
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end
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"%5d#{suffix}" % b
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end
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pwhash.memlimit = Cox::Pwhash::MEMLIMIT_MIN
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loop do
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pwhash.opslimit = Cox::Pwhash::OPSLIMIT_MIN
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row = ["%5dK" % (pwhash.memlimit / 1024)]
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data << row
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loop do
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# p pwhash
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t = Time.measure { pwhash.store pass }.to_f
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ostr = "%7d" % pwhash.opslimit
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header << ostr if data.size == 2
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if t >= time_min
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mstr = bytes_str pwhash.memlimit
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# mstr = "%5dK" % (pwhash.memlimit / 1024)
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tstr = "%6.3fs" % t
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row << tstr
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s = String.build do |sb|
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sb << "mem_limit "
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sb << mstr
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sb << " ops_limit "
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sb << ostr
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sb << " "
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sb << tstr
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end
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puts s
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else
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row << " "
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end
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break if t >= time_limit
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pwhash.opslimit *= 4
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end
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row << "" # puts | on the end
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puts ""
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break if pwhash.memlimit >= mem_limit
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break if pwhash.opslimit == Cox::Pwhash::OPSLIMIT_MIN # Couldn't get past 1 iteration before going over time.
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pwhash.memlimit *= 4
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end
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# header << "Ops limit"
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data << ["Memory"]
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# Quick n dirty sparse table.
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puts "Ops Limit --->"
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data.each do |row|
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puts row.join(" | ")
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end
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