[Haskell-cafe] viewing HS files in Firefox
When I try to go to one of the Module.hs files, e.g. on darcs.haskell.org, it now has type HS and Firefox refuses to display it (and only lets me download it). Does anyone know how to make Firefox treat certain file types as others (HS as plain text, in particular)? so that I can browse them with any convenience Thanks, Isaac ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] viewing HS files in Firefox
On 27/10/2007, Isaac Dupree [EMAIL PROTECTED] wrote: When I try to go to one of the Module.hs files, e.g. on darcs.haskell.org, it now has type HS and Firefox refuses to display it (and only lets me download it). Does anyone know how to make Firefox treat certain file types as others (HS as plain text, in particular)? so that I can browse them with any convenience I've looked into this before but haven't found a satisfactory answer. At best, you can get the offending MIME types to open in a third party text viewer. But I don't know how to force the internal text viewer. Actually, a thought occurs. The address bar prefix view-source: works for html. As in, http://www.haskell.org; - view-source:http://www.haskell.org;. This might be an effective workaround though I don't have a page to test it on right now. Cheers, D. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Fusing foldr's
On 10/26/07, Dan Weston [EMAIL PROTECTED] wrote:
Thanks for letting me know about the Data.Strict library on Hackage. I
will definitely make use of that! BTW, you left out an import
Data.List(foldl') in your example.
Yes, Data.Strict can be pretty handy for getting the right strictness.
Sorry about the missing import.
My timing test is an order of magnitude worse than yours. Do you have an
extra zero in your list endpoint?
I fed these functions to ghc with the -O2 and -threaded flags and
timed them using the list [1..1000]. The result (best times out of
several runs):
avg4: 284 ms
avgS: 184 ms
avgP: 248 ms
Using ghc -threaded -O2 --make Avg.hs for ghc 6.6.1, I ran your tests on
[1..1000] and got the user times:
avg4: 12.75 s
avgS: 3.65 s
avgP: 15.56 s
The funny thing is that avg4/avgS = 3.5 for and only 1.5 for you. I
understand that with only 1 processor my avgP time may be twice yours,
but not the avgS or avg4.
Oooops.. My numbers are totally bogus. I had code that looked like the
following:
\begin{code}
main = do
time avg4 [1..1000]
time avg4 [1..1000]
time avg4 [1..1000]
time avgS [1..1000]
time avgS [1..1000]
time avgS [1..1000]
time avgP [1..1000]
time avgP [1..1000]
time avgP [1..1000]
\end{code}
Not very elegant I know but I thought it would do the job. Apparently
I was wrong. GHC does common subexpression elimination on all the
lists so they're all shared between the different calls. Of course,
the first function call would always take long time but I ignored it,
thinking it was some anomaly. Anyway, I was totally sure that GHC only
did cse on constructor expressions and not on arbitrary computations.
Guess I was wrong. A little searching revealed the following quote by
Simon PJ:
GHC does a very simple form of CSE. If it sees
let x = e in e
it replaces the inner 'e' by x. But that's all at the moment.
Lesson learned.
Less bogus timing:
avg4: 18.0s
avgS: 2.2s
avgP: 17.4s
OK, so these figures make an even stronger case for my conclusion :-)
Single traversal can be much faster than multiple traversals *when
done right*.
I have the following machine:
Main memory size: 2026 Mbytes
Num Processors: 1
Processor Type: Intel(R) Xeon(TM) CPU 2.80GHz x32
Clock Speed: 2790 MHZ
In case you're still interested my machine looks like this:
Memory: 2026 Mbytes
Processor: AMD Turion(tm) 64 X2 Mobile Technology TL-56
Clock Speed: 1800MHz
All the best,
/Josef
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Re: [Haskell-cafe] viewing HS files in Firefox
Dougal Stanton wrote: On 27/10/2007, Isaac Dupree [EMAIL PROTECTED] wrote: When I try to go to one of the Module.hs files, e.g. on darcs.haskell.org, it now has type HS and Firefox refuses to display it (and only lets me download it). Does anyone know how to make Firefox treat certain file types as others (HS as plain text, in particular)? so that I can browse them with any convenience I've looked into this before but haven't found a satisfactory answer. At best, you can get the offending MIME types to open in a third party text viewer. But I don't know how to force the internal text viewer. Actually, a thought occurs. The address bar prefix view-source: works for html. As in, http://www.haskell.org; - view-source:http://www.haskell.org;. This might be an effective workaround though I don't have a page to test it on right now. hmm, taking http://darcs.haskell.org/ghc-6.6/packages/base/Data/Map.hs that works, but it's rather inconvenient to convince Firefox to put the URL into the address bar so I can type view-source in front. I had to use copy link location, make a new tab, and paste into the empty address bar (unless there's some way I didn't find) ISaac ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Fusing foldr's
Josef Svenningsson wrote: Less bogus timing: avg4: 18.0s avgS: 2.2s avgP: 17.4s OK, so these figures make an even stronger case for my conclusion :-) Single traversal can be much faster than multiple traversals *when done right*. Did you use +RTS -N2 on your program (or whatever it is that makes GHC actually use multiple threads? or is that not necessary?) Anyway I assume you wouldn't get better than 9.0s, which is still much worse than 2.2s. Isaac ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] viewing HS files in Firefox
On Sat, 2007-10-27 at 18:48 -0400, Isaac Dupree wrote: When I try to go to one of the Module.hs files, e.g. on darcs.haskell.org, it now has type HS and Firefox refuses to display it (and only lets me download it). Does anyone know how to make Firefox treat certain file types as others (HS as plain text, in particular)? so that I can browse them with any convenience I believe those kinds of problem have to do with the MIME-encoding on the server side: The server uses text/x-haskell. For Firefox to display the document inline it probably has to be text/plain. Not sure what the proper fix is, though. / Thomas ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Tim Sweeney and multi-cores .... and Haskell
http://www.americanscientist.org/content/AMSCI/AMSCI/ArticleAltFormat/2007102151724_866.pdf ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
