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| jhague at dadgum.com |
 Posted: Fri May 21, 1999 2:50 pm |
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I'm writing some external C routines to be called from Erlang. I'll be
calling these routines a good many times per second. Each call will only
contain a small amount of data--three or four integers.
Is there any significant performance difference between using ports
and the newer, more direct method?
James
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| klacke at bluetail.com |
| Posted: Fri May 21, 1999 10:27 pm |
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>
> Is there any significant performance difference between using ports
> and the newer, more direct method?
>
What do you mean by "newer, more direct method" ??
/klacke
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| markn at cs.mu.OZ.AU |
| Posted: Sat May 22, 1999 1:13 am |
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On Sat, May 22, 1999 at 12:21:33AM +0200, Claes Wikstrom wrote:
>
> >
> > Is there any significant performance difference between using ports
> > and the newer, more direct method?
> >
>
>
> What do you mean by "newer, more direct method" ??
>
he probally meant the dynamic share library version, a linked in driver. :)
Speaking of the C interface, what are the plans for IG ?
At the moment it seems to rather limited, no handling of preprocessor directives
like #ifdef, #include.. forward typedefs etc.. but it is very niffy for simpler
Erlang to C calls. :)
mark
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| klacke at bluetail.com |
| Posted: Sat May 22, 1999 6:49 pm |
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>
> On Sat, May 22, 1999 at 12:21:33AM +0200, Claes Wikstrom wrote:
> >
> > >
> > > Is there any significant performance difference between using ports
> > > and the newer, more direct method?
> > >
> >
> >
> > What do you mean by "newer, more direct method" ??
> >
>
> he probally meant the dynamic share library version, a linked in driver. 
>
In that case the difference in performance between
calling a c-func in a linked driver versus calling a
c-func in another os process is enormous. It of
cource depends on the underlying OS, but on unix'es it's high
and on win32 it's extremely++ high.
The advantage of a linked-in driver is speed, the disadvantages are
the difficulties that are associated with running together with
the erlang runtime system. No blocking syscalls etc.
>
> Speaking of the C interface, what are the plans for IG ?
Yes, I'd like to know too ??
/klacke
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| jhague at dadgum.com |
| Posted: Mon May 24, 1999 2:16 am |
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> > What do you mean by "newer, more direct method" ??
> >
>
> he probally meant the dynamic share library version, a linked in driver. :)
Actually, I was under the mistaken assumption that IG used a different
method than ports, but I now see that they are exactly the same thing.
>The advantage of a linked-in driver is speed, the disadvantages are
>the difficulties that are associated with running together with
>the erlang runtime system. No blocking syscalls etc.
I've been considering trying this, because I think it would be
interesting. Are there any good examples? (There's probably at least
one in the documentation, but I haven't come across it yet :)
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| tobbe at serc.rmit.edu.au |
| Posted: Mon May 24, 1999 3:08 am |
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> I've been considering trying this, because I think it would be
> interesting. Are there any good examples? (There's probably at least
> one in the documentation, but I haven't come across it yet :)
There is a very simple example in the User Contrib area named: byteorder-1.0
Also: check out the device driver Appendix in the book.
/Tobbe
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