source: zzuf/trunk/test/check-zzuf-r-ratio @ 4394

Last change on this file since 4394 was 4394, checked in by Sam Hocevar, 10 years ago

Make check-zzuf-r-ratio slightly more tolerant.

  • Property svn:executable set to *
File size: 2.3 KB
Line 
1#!/bin/sh
2#
3#  check-zzuf-r-ratio - zzuf RNG statistic tests
4#  Copyright (c) 2008-2010 Sam Hocevar <sam@hocevar.net>
5#                All Rights Reserved
6#
7#  This program is free software. It comes without any warranty, to
8#  the extent permitted by applicable law. You can redistribute it
9#  and/or modify it under the terms of the Do What The Fuck You Want
10#  To Public License, Version 2, as published by Sam Hocevar. See
11#  http://sam.zoy.org/wtfpl/COPYING for more details.
12#
13
14. "$(dirname "$0")/functions.inc"
15
16checkflip()
17{
18    r=$1
19    expect=$2
20    mib=20
21    try=3
22    s2=$seed
23    new_test "$mib MiB of zeroes, ratio $r"
24    echo " expecting $expect"
25    checkflip_internal $1 $2 $mib $try $s2
26}
27
28checkflip_internal()
29{
30    r=$1
31    expect=$2
32    mib=$3
33    try=$4
34    s2=$5
35    rmax=-1
36    rmin=-1
37    rtot=0
38    printf " got"
39    for x in 0 1 2 3 4; do
40        ret=`dd if=/dev/zero bs=1048576 count=$mib 2>/dev/null | $ZZUF -s $s2 -r $r | "$ZZERO"`
41        if [ "$rmax" = -1 -o "$ret" -gt "$rmax" ]; then rmax=$ret; fi
42        if [ "$rmin" = -1 -o "$ret" -lt "$rmin" ]; then rmin=$ret; fi
43        rtot=`expr $rtot + $ret || true`
44        printf " $ret"
45        s2=`expr $s2 + 1`
46    done
47    echo ""
48    rmean=`expr '(' $rtot + 2 ')' / 5 || true`
49    delta=`expr $rmean - $expect || true`
50    printf " min/avg/max $rmin/$rmean/$rmax .........."
51    if [ "$delta" -gt -5 -a "$delta" -lt 5 ]; then
52        pass_test " ok"
53    elif [ $(($rmean * 8)) -lt $(($expect * 7)) \
54               -o $(($rmean * 7)) -gt $(($expect * 8)) ]; then
55        if [ $try -gt 0 ]; then
56            # Hack: if we failed with that seed, just try another one.
57            # Kinda defeats the purpose of the test, but well, that's
58            # how randomness works, you cannot win each time.
59            echo " trying again"
60            checkflip_internal $1 $2 $3 $(($3 - 1)) "$3$s2"
61        else
62            fail_test " FAILED"
63        fi
64    else
65        pass_test " ok"
66    fi
67}
68
69start_test "zzuf -r test"
70
71# if X flips are performed on N bits set to 0, the average number of bits
72# set to 1 is: N / 2 * (1 - pow(1 - 2 / N, X)
73checkflip 0.000000001 0
74checkflip 0.00000001  1
75checkflip 0.0000001  16
76checkflip 0.000001  167
77checkflip 0.00001  1677
78checkflip 0.0001  16775
79checkflip 0.001  167604
80checkflip 0.01  1661055
81checkflip 0.1  15205967
82
83stop_test
84
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