On 29 April 2004 10:17, David Sabel wrote:
>> You could try out that theory by copying the definition of
>> unsafePerformIO into your code, and putting an INLINE pragma on it.
>> I think it's safe to do this in your case (it's not safe in general).
>
> That's interesting for me, in which situati
Hi,
> > Results:
> >
> >method runtime (s)
> >---
> >pure0.7
> >ffi 3.2
> >fastMut 15
> >ioref 23
>
> I very strongly suspect that it is the unsafePerformIO that hurts
> performance in the fastMut
On Tue, Apr 20, 2004 at 01:59:33PM +0100, Simon Marlow wrote:
> On 20 April 2004 12:48, Bernard James POPE wrote:
>
> > Results:
> >
> >method runtime (s)
> >---
> >pure0.7
> >ffi 3.2
> >fastMut 15
> >ioref
On Tue, Apr 20, 2004 at 02:56:36PM +0200, Ketil Malde wrote:
> Bernard James POPE <[EMAIL PROTECTED]> writes:
>
> > Note each program was compiled with ghc 6.2 with -O2 on debian linux.
> :
> > main = print $ loop 1 0
>
> Isn't this going to be optimized away to a constant w
Hi Andre,
> There's another way which you missed: using implicit parameters. I
> remember reading a paper a while ago called Global Variables in Haskell
> (sorry, don't remember the author -- Jones, perhaps?) which did similar
> benchmarking to yours, and carrying around the global variable wi
On 20/04/2004, at 9:48 PM, Bernard James POPE wrote:
To test out the various possible ways of implementing a global counter
I wrote some test cases (shown below). I hope the test cases are
useful, and provide some indication of the relative performance.
However, if you spot something bogus please
On 20 April 2004 12:48, Bernard James POPE wrote:
> Results:
>
>method runtime (s)
>---
>pure0.7
>ffi 3.2
>fastMut 15
>ioref 23
I very strongly suspect that it is the unsafePerformIO that hurts
per
Bernard James POPE <[EMAIL PROTECTED]> writes:
> Note each program was compiled with ghc 6.2 with -O2 on debian linux.
:
> main = print $ loop 1 0
Isn't this going to be optimized away to a constant with -O2?
-kzm
--
If I haven't seen further, it is by standing in the foot
On Thu, Apr 15, 2004 at 10:43:22AM -0700, Carl Witty wrote:
> > > However, if you have any suggestions about how to make a FAST
> > > global counter
> > > I would be very glad to hear it. From profiling it seems like
> > > this code
> > > is a little expensive (also it is called quite frequently)
> > However, if you have any suggestions about how to make a FAST
> > global counter
> > I would be very glad to hear it. From profiling it seems like
> > this code
> > is a little expensive (also it is called quite frequently).
>
> You could try the FastMutInt module from GHC
> (ghc/compiler/ut
> So I have code like:
>
>{-# NOINLINE count #-}
>count :: IORef Int
>count = unsafePerformIO $ newIORef 0
>
>{-# NOINLINE getCount #-}
>getCount :: (Int -> a) -> a
>getCount f
> = let nextCount
> = (unsafePerformIO $
> do oldCount <- r
On Thu, Apr 15, 2004 at 01:52:38PM +1000, Bernard James POPE wrote:
>
> However, if you have any suggestions about how to make a FAST global counter
> I would be very glad to hear it. From profiling it seems like this code
> is a little expensive (also it is called quite frequently).
Well, I'm no
On Tue, Apr 13, 2004 at 02:03:21PM +0100, Simon Marlow wrote:
>
> > On Fri, Apr 09, 2004 at 03:27:01PM +0200, David Sabel wrote:
> >
> > > you can turn off let-floating by compiling without optimizations,
> > > i.e. without using a -O flag or using -O0 expli
> On Fri, Apr 09, 2004 at 03:27:01PM +0200, David Sabel wrote:
>
> > you can turn off let-floating by compiling without optimizations,
> > i.e. without using a -O flag or using -O0 explicitly.
> > The disadvantage is that most of all other optimizations
> > ar
On Fri, Apr 09, 2004 at 03:27:01PM +0200, David Sabel wrote:
> you can turn off let-floating by compiling without optimizations,
> i.e. without using a -O flag or using -O0 explicitly.
> The disadvantage is that most of all other optimizations
> are turned off too.
That is exac
Hi,
you can turn off let-floating by compiling without optimizations,
i.e. without using a -O flag or using -O0 explicitly.
The disadvantage is that most of all other optimizations
are turned off too.
Another possibility would be to compile your program with HasFuse
http
On Tue, Apr 06, 2004 at 09:38:38AM +0100, Simon Peyton-Jones wrote:
> Strangely (and bogusly) there is no such flag in GHC6.2. Someone must
> have noticed this already because it's there in the HEAD
> (-fno-full-laziness), and has been since Feb 2004. Strange.
Thanks,
I think it would be good f
EMAIL PROTECTED] On Behalf Of Bernard James POPE
| Sent: 06 April 2004 09:24
| To: [EMAIL PROTECTED]
| Cc: Bernard James POPE
| Subject: turn off let floating
|
| Hi all,
|
| In the documentation for System.IO.Unsafe
| it says:
|
|Make sure that the either you switch off let-floating,
|or tha
Hi all,
In the documentation for System.IO.Unsafe
it says:
Make sure that the either you switch off let-floating,
or that the call to unsafePerformIO cannot float outside a lambda.
My question is how can you turn off let floating? I can't seem to
find a flag that suggests
19 matches
Mail list logo
