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('command '))
fh=open(os.path.join(self.dirname, self.filename),'r')
i.write(fh.read())
i.close()
self.StringData=o.read()
o.close()