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ruanhaishen
redis
Commits
e6948b8f
Commit
e6948b8f
authored
Feb 18, 2019
by
antirez
Browse files
showdist.rb utility for SRANDMEMBER analysis added.
parent
86802d4f
Changes
2
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Inline
Side-by-side
utils/srandmember/README.md
0 → 100644
View file @
e6948b8f
This utility plots the distribution of SRANDMEMBER to evaluate how fair it is.
See http://theshfl.com/redis_sets for more information on the topic.
utils/srandmember/showdist.rb
0 → 100644
View file @
e6948b8f
require
'redis'
r
=
Redis
.
new
r
.
select
(
9
)
r
.
del
(
"myset"
);
r
.
sadd
(
"myset"
,(
0
..
999
).
to_a
)
freq
=
{}
100
.
times
{
res
=
r
.
pipelined
{
1000
.
times
{
r
.
srandmember
(
"myset"
)
}
}
res
.
each
{
|
ele
|
freq
[
ele
]
=
0
if
freq
[
ele
]
==
nil
freq
[
ele
]
+=
1
}
}
# Convert into frequency distribution
dist
=
{}
freq
.
each
{
|
item
,
count
|
dist
[
count
]
=
0
if
dist
[
count
]
==
nil
dist
[
count
]
+=
1
}
min
=
dist
.
keys
.
min
max
=
dist
.
keys
.
max
(
min
..
max
).
each
{
|
x
|
count
=
dist
[
x
]
count
=
0
if
count
==
nil
puts
"
#{
x
}
->
#{
"*"
*
count
}
"
}
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