Marshalling large amount of data from and to C http://phyx.pastebin.com/WXGBr1bX shows the code I use to do this (it's autogenerated, so just looking at 1 block should be enough) The tool is mine, so i can change the code it generates, but i would need to know how to do it better first. On Tue, Jul 13, 2010 at 3:30 PM, Magnus Therning wrote:

On Tue, Jul 13, 2010 at 13:29, Phyx wrote:

...

Hello

I'm wondering if anyone ever benchmarked marshalling in Haskell/GHC. No matter how much I optimize my Haskell code my program still seems to run slow, which leads me to beleive that Marshalling is painfully slow.

Does anyone know a way I can test this and fix it?

What kind of marshalling are you referring to?

/M

-- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe

I understand that part, but the strings are generated from SDocs, and So unless internally SDoc doesn't use String then I'm afraid there's nothing I can do about that :/ Or rather, Is there a way to efficiently make CWStrings from SDocs? Regards, Phyx On Tue, Jul 13, 2010 at 6:56 PM, Thomas DuBuisson < thomas.dubuisson@gmail.com> wrote:

That code is effectively copying the data (thats what those peeks / pokes do), so it stands to reason it would be slow by most performance standards. The reason ByteStrings are fast when used both by C and Haskell is there is a zero-copy `useAsCString`.

Cheers, Thomas

On Tue, Jul 13, 2010 at 7:49 AM, Phyx wrote:

...

Marshalling large amount of data from and to C

http://phyx.pastebin.com/WXGBr1bX shows the code I use to do this (it's autogenerated, so just looking at 1 block should be enough)

The tool is mine, so i can change the code it generates, but i would need to know how to do it better first.

On Tue, Jul 13, 2010 at 3:30 PM, Magnus Therning wrote:

...

On Tue, Jul 13, 2010 at 13:29, Phyx wrote:

...

Hello

I'm wondering if anyone ever benchmarked marshalling in Haskell/GHC.

No

...

...

matter how much I optimize my Haskell code my program still seems to run slow, which leads me to beleive that Marshalling is painfully slow.

Does anyone know a way I can test this and fix it?

What kind of marshalling are you referring to?

/M

-- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe

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