subprocess.Popen hangs at times?

[Fredrik Lundh]

Kenneth McDonald wrote:

> When making calls of the form Popen(cmd, shell=True, 
> stdout=subprocess.PIPE), we've been getting occasional, predictable 
> hangs. Will Popen accumulate a certain amount of stdout and then block 
> until its read?

the pipe provided by the operating system has a limited buffer size 
(usually just a few kilobytes).  when the buffer fills up, the operating 
system will halt the external process.

</F>