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go
golang
Commits
86c0c54d
Commit
86c0c54d
authored
Dec 08, 2009
by
Russ Cox
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test/bench: faster fasta (mostly due to bufio fix)
R=r
https://golang.org/cl/165083
parent
0d3301a5
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18 deletions
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-18
fasta.go
test/bench/fasta.go
+16
-18
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test/bench/fasta.go
View file @
86c0c54d
...
...
@@ -62,20 +62,6 @@ type AminoAcid struct {
c
byte
;
}
var
lastrandom
uint32
=
42
// Random number between 0.0 and 1.0
func
myrandom
()
float
{
const
(
IM
=
139968
;
IA
=
3877
;
IC
=
29573
;
)
lastrandom
=
(
lastrandom
*
IA
+
IC
)
%
IM
;
// Integer to float conversions are faster if the integer is signed.
return
float
(
int32
(
lastrandom
))
/
IM
;
}
func
AccumulateProbabilities
(
genelist
[]
AminoAcid
)
{
for
i
:=
1
;
i
<
len
(
genelist
);
i
++
{
genelist
[
i
]
.
p
+=
genelist
[
i
-
1
]
.
p
...
...
@@ -104,6 +90,14 @@ func RepeatFasta(s []byte, count int) {
}
}
var
lastrandom
uint32
=
42
const
(
IM
=
139968
;
IA
=
3877
;
IC
=
29573
;
)
// Each element of genelist is a struct with a character and
// a floating point number p between 0 and 1.
// RandomFasta generates a random float r and
...
...
@@ -117,11 +111,15 @@ func RandomFasta(genelist []AminoAcid, count int) {
for
count
>
0
{
line
:=
min
(
WIDTH
,
count
);
for
pos
:=
0
;
pos
<
line
;
pos
++
{
r
:=
myrandom
();
var
i
int
;
for
i
=
0
;
genelist
[
i
]
.
p
<
r
;
i
++
{
lastrandom
=
(
lastrandom
*
IA
+
IC
)
%
IM
;
// Integer to float conversions are faster if the integer is signed.
r
:=
float
(
int32
(
lastrandom
))
/
IM
;
for
_
,
v
:=
range
genelist
{
if
v
.
p
>=
r
{
buf
[
pos
]
=
v
.
c
;
break
;
}
}
buf
[
pos
]
=
genelist
[
i
]
.
c
;
}
buf
[
line
]
=
'\n'
;
out
.
Write
(
buf
[
0
:
line
+
1
]);
...
...
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