Skip to content
GitLab
Projects
Groups
Snippets
Help
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Sign in / Register
Toggle navigation
N
nofib
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Locked Files
Issues
9
Issues
9
List
Boards
Labels
Service Desk
Milestones
Iterations
Merge Requests
1
Merge Requests
1
Requirements
Requirements
List
CI / CD
CI / CD
Pipelines
Jobs
Schedules
Security & Compliance
Security & Compliance
Dependency List
License Compliance
Operations
Operations
Incidents
Environments
Packages & Registries
Packages & Registries
Package Registry
Container Registry
Analytics
Analytics
CI / CD
Code Review
Insights
Issue
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Jobs
Commits
Issue Boards
Open sidebar
Glasgow Haskell Compiler
nofib
Commits
ca583983
Commit
ca583983
authored
Feb 23, 2009
by
Simon Marlow
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
use parBuffer
parent
e3d6d4da
Changes
1
Hide whitespace changes
Inline
Sidebyside
Showing
1 changed file
with
66 additions
and
6 deletions
+66
6
parallel/ray/Main.lhs
parallel/ray/Main.lhs
+66
6
No files found.
parallel/ray/Main.lhs
View file @
ca583983
The Ray tracer algorithm taken from Paul Kelly's book, adapted by Greg
Michaelson for SML, converted to (parallel) Haskell by Kevin Hammond!
>
{# LANGUAGE BangPatterns #}
>
import
Control.Parallel
>
import
Control.Parallel.Strategies
(
Strategy
,
sparking
,
rwhnf
)
>
import
System.Environment
>
main
=
do
...
...
@@ 127,10 +129,6 @@ in_poly_test (p,q,r) (A,B,C) Vs
>
earlier
NoImpact
i2
=
i2
>
earlier
i1
@
(
Impact
d1
_
)
i2
@
(
Impact
d2
_
)
=
if
d1
<=
d2
then
i1
else
i2
>
parList
::
[
a
]
>
()
>
parList
[]
=
()
>
parList
(
x
:
xs
)
=
x
`
par
`
parList
xs
>
insert
::
(
Impact
>
Impact
>
Impact
)
>
Impact
>
[
Impact
]
>
Impact
>
insert
f
d
[]
=
d
>
insert
f
d
(
x
:
xs
)
=
f
x
(
insert
f
d
xs
)
...
...
@@ 140,9 +138,71 @@ in_poly_test (p,q,r) (A,B,C) Vs
>
where
earliest
=
insert
earlier
NoImpact
>
findImpacts
::
[
Ray
]
>
[
Object
]
>
[
Impact
]
>
findImpacts
rays
objects
=
parList
r
`
pseq
`
r
>
where
r
=
map
(
firstImpact
objects
)
rays
>
findImpacts
rays
objects
=
parBuffer
200
$
map
(
firstImpact
objects
)
rays
>
using
::
a
>
(
a
>
()
)
>
a
>
using
a
s
=
s
a
`
seq
`
a
>
chunk
n
[]
=
[]
>
chunk
n
xs
=
as
:
chunk
n
bs
where
(
as
,
bs
)
=
splitAt
n
xs
mymap f xs = go xs where go [] = []; go (x:xs) = f x : go xs
>
mymap
f
[]
=
[]
>
mymap
f
(
x
:
xs
)
=
f
x
:
map
f
xs
>
parmap
::
(
a
>
b
)
>
[
a
]
>
[
b
]
>
parmap
f
[]
=
[]
>
parmap
f
(
x
:
xs
)
=
fx
`
par
`
(
pmxs
`
par
`
(
fx
:
pmxs
))
>
where
fx
=
f
x
>
pmxs
=
parmap
f
xs
>
parBuffer
::
Int
>
[
a
]
>
[
a
]
>
parBuffer
n
xs
=
return
xs
(
start
n
xs
)
>
where
>
return
(
x
:
xs
)
(
y
:
ys
)
=
y
`
par
`
(
x
:
return
xs
ys
)
>
return
xs
[]
=
xs
>
>
start
!
n
[]
=
[]
>
start
0
ys
=
ys
>
start
!
n
(
y
:
ys
)
=
y
`
par
`
start
(
n

1
)
ys
parBuffer :: Int > Strategy a > [a] > [a]
parBuffer n s xs = return xs (start n xs)
where
return (x:xs) (y:ys) = (x : return xs ys)
`sparking` s y
return xs [] = xs
start !n [] = []
start 0 ys = ys
start !n (y:ys) = start (n1) ys `sparking` s y
>
parListN
::
Int
>
[
a
]
>
[
a
]
>
parListN
0
xs
=
xs
>
parListN
!
n
[]
=
[]
>
parListN
!
n
(
x
:
xs
)
=
x
`
par
`
parListN
(
n

1
)
xs
>
>
 like parListN, but starts the sparks in reverse order
>
parListN1
::
Int
>
[
a
]
>
[
a
]
>
[
a
]
>
parListN1
0
xs
ys
=
parList
ys
`
pseq
`
xs
>
parListN1
!
n
[]
ys
=
parList
ys
`
pseq
`
[]
>
parListN1
!
n
(
x
:
xs
)
ys
=
parListN1
(
n

1
)
xs
(
x
:
ys
)
>
>
seqList
::
[
a
]
>
()
>
seqList
[]
=
()
>
seqList
(
x
:
xs
)
=
x
`
pseq
`
seqList
xs
>
>
parList
::
[
a
]
>
()
>
parList
[]
=
()
>
parList
(
x
:
xs
)
=
x
`
par
`
parList
xs
>
>
lazyParList
::
Int
>
[
a
]
>
[
a
]
>
lazyParList
!
n
xs
=
go
xs
(
parListN
n
xs
)
>
where
>
go
[]
_ys
=
[]
>
go
(
x
:
xs
)
[]
=
x
:
xs
>
go
(
x
:
xs
)
(
y
:
ys
)
=
y
`
par
`
(
x
:
go
xs
ys
)
(*** Functions to generate a list of rays ******
GenerateRays Detail X Y Z
...
...
Write
Preview
Markdown
is supported
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