Re[2]: [Haskell-cafe] Linux ghci vs Windows ghci

[Bulat Ziganshin]

Hello Brandon,

Wednesday, February 24, 2010, 8:08:41 AM, you wrote:

 I feel that ghci code executing speed in guest os is 1.5~2x faster
 than host os

 My guess is that GHC (and the GHC RTS) on win32 is using a POSIX  
 emulation layer supplied by mingw32 for all system calls, introducing
 extra overhead.

1. yes, mingw is using POSIX emulation layer for file operations, but
i don't believe that it provides any serious overhead - even for i/o

2. this example was purely computational, no OS calls involved




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 Bulatmailto:bulat.zigans...@gmail.com

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Re: [Haskell-cafe] Linux ghci vs Windows ghci

[Brandon S. Allbery KF8NH]

On Feb 21, 2010, at 06:27 , Donghee Nah wrote:
I'm using Windows 7 32bit Host OS(ghc 6.8.3) and Virtualbox  
Archlinux Guest OS(ghc 6.8.4)
I feel that ghci code executing speed in guest os is 1.5~2x faster  
than host os


My guess is that GHC (and the GHC RTS) on win32 is using a POSIX  
emulation layer supplied by mingw32 for all system calls, introducing  
extra overhead.  Unfortunately, I don't think we have enough Windows- 
familiar folks with enough understanding of the GHC RTS to optimize it  
for the native Windows API.


--
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allb...@kf8nh.com
system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon universityKF8NH




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Re: [Haskell-cafe] Linux ghci vs Windows ghci

[Joachim Breitner]

Hi,

Am Sonntag, den 21.02.2010, 13:58 +0100 schrieb Ketil Malde:
 Donghee Nah ppk...@gmail.com writes:
  I feel that ghci code executing speed in guest os is 1.5~2x faster than host
  os
 
  The code:
  let t n = do {if n `mod` 10 == 0 then print n else return ()}  t (n+1)
  t 1
 
  any clue?
 
 Speed of the terminal?  Cost of syscalls (user/kernel transitions)?

also note that I observed similar things with Win32 code vs. Linux code
when compiling stuff unoptimized. See

http://www.joachim-breitner.de/blog/archives/358-Building-arbtt-for-Windows.html

the first three paragraphs.

But I don’t know why that is.

Greetings,
Joachim

-- 
Joachim nomeata Breitner
  mail: m...@joachim-breitner.de | ICQ# 74513189 | GPG-Key: 4743206C
  JID: nome...@joachim-breitner.de | http://www.joachim-breitner.de/
  Debian Developer: nome...@debian.org


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[Haskell-cafe] Linux ghci vs Windows ghci

[Donghee Nah]

I'm using Windows 7 32bit Host OS(ghc 6.8.3) and Virtualbox Archlinux Guest
OS(ghc 6.8.4)

I feel that ghci code executing speed in guest os is 1.5~2x faster than host
os

The code:
let t n = do {if n `mod` 10 == 0 then print n else return ()}  t (n+1)
t 1

any clue?
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Re: [Haskell-cafe] Linux ghci vs Windows ghci

[Ketil Malde]

Donghee Nah ppk...@gmail.com writes:

 I feel that ghci code executing speed in guest os is 1.5~2x faster than host
 os

 The code:
 let t n = do {if n `mod` 10 == 0 then print n else return ()}  t (n+1)
 t 1

 any clue?

Speed of the terminal?  Cost of syscalls (user/kernel transitions)?

-k
-- 
If I haven't seen further, it is by standing in the footprints of giants
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