Skip to content
GitLab
Menu
Projects
Groups
Snippets
/
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in
Toggle navigation
Menu
Open sidebar
pub
pi
Commits
68d1de0b
Commit
68d1de0b
authored
Dec 15, 2018
by
Neil Gershenfeld
Browse files
Merge branch 'master' of fab2neilg:pub/pi
parents
6007d0b7
5d0f37f5
Changes
3
Hide whitespace changes
Inline
Side-by-side
Node/clusterpi.js
View file @
68d1de0b
...
...
@@ -11,7 +11,7 @@ else
child
()
function
master
()
{
var
processes
=
parseInt
(
process
.
argv
[
2
])
var
points
=
1
e
10
var
points
=
1
e
9
var
pi
=
0
var
results
=
0
var
tstart
=
Date
.
now
()
/
1000
...
...
Node/forkpi.js
View file @
68d1de0b
...
...
@@ -4,7 +4,7 @@
// pi calculation benchmark
// pi = 3.14159265358979323846
//
const
points
=
1
e
8
const
points
=
1
e
9
const
{
fork
}
=
require
(
'
child_process
'
)
var
processes
=
parseInt
(
process
.
argv
[
2
])
var
pi
=
0
...
...
Node/workerpi.js
0 → 100644
View file @
68d1de0b
//
// workerpi.js
// Neil Gershenfeld 12/11/18
// pi calculation benchmark
// pi = 3.14159265358979323846
//
const
{
Worker
}
=
require
(
'
worker_threads
'
)
var
points
=
1
e9
var
thread
=
`
const Worker = require('worker_threads')
Worker.parentPort.on('message',(msg) => {
var index = msg.index
var points = msg.points
var a = 0.5
var b = 0.75
var c = 0.25
var sum = 0
var start = 1+points*index
var end = points*(index+1)
for (var i = start; i <= end; ++i)
sum += a/((i-b)*(i-c))
Worker.parentPort.postMessage(sum)
})
`
var
workers
=
parseInt
(
process
.
argv
[
2
])
var
results
=
0
var
pi
=
0
var
tstart
=
Date
.
now
()
/
1000
for
(
let
i
=
0
;
i
<
workers
;
++
i
)
{
var
worker
=
new
Worker
(
thread
,{
eval
:
true
})
worker
.
on
(
'
message
'
,(
sum
)
=>
{
results
+=
1
pi
+=
sum
if
(
results
==
workers
)
{
var
tend
=
Date
.
now
()
/
1000
var
mflops
=
(
workers
*
points
)
*
5.0
*
1
e
-
6
/
(
tend
-
tstart
)
console
.
log
(
'
pi:
'
+
pi
)
console
.
log
(
'
time:
'
+
(
tend
-
tstart
).
toFixed
(
1
)
+
'
s
'
)
console
.
log
(
'
workers:
'
+
workers
)
console
.
log
(
'
estimated MFlops:
'
+
mflops
.
toFixed
(
1
))
process
.
exit
()
}
})
worker
.
postMessage
({
index
:
i
,
points
:
points
})
}
Write
Preview
Supports
Markdown
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment