Maxmium bufsize using open2?

[Maurice]

Dear all,

I've a problem using popen2 when using large files.
When I use small input files everything works well but when I feed large
inputfile to the pipe nothing happens. Is there a maximum bufsize for
using the pipe. The code I use is written down here below. Do I need to
specify a waittime between line 4 and 5 ?


o,i =popen2('comman d '))
fh=open(os.path .join(self.dirn ame, self.filename), 'r')
i.write(fh.read ())
i.close()
self.StringData =o.read()
o.close()

[Thomas Güttler]

Re: Maxmium bufsize using open2?

Maurice wrote:
[color=blue]
> Dear all,
>
> I've a problem using popen2 when using large files.
> When I use small input files everything works well but when I feed large
> inputfile to the pipe nothing happens. Is there a maximum bufsize for
> using the pipe. The code I use is written down here below. Do I need to
> specify a waittime between line 4 and 5 ?
>
>
> o,i =popen2('comman d '))
> fh=open(os.path .join(self.dirn ame, self.filename), 'r')
> i.write(fh.read ())
> i.close()
> self.StringData =o.read()
> o.close()[/color]

Hi,

Have a look at the select module.

thomas

[Piet van Oostrum]

Re: Maxmium bufsize using open2?

As someone else already mentioned, using select is another solution.
All solution amount to the fact the input and output to the process are
interleaved.
--
Piet van Oostrum <piet@cs.uu.n l>
URL: http://www.cs.uu.nl/~piet [PGP]
Private email: P.van.Oostrum@h ccnet.nl