Re: PyRO Flame and Windows

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On 26-11-2012 15:54, Assaf wrote:
> Hi All,
> 
> 2 issues we have with the great FLAME feature.
> 
> 1. We run a flame server on a Windows host (2008 R2) and execute python code on a
> linux. from time to time the client just hangs, after several CTRL-C, re-runs it
> succeeds. Windows firewall was disabled. it seems like hanging in the line: 
> data=sock.recv(size, socket.MSG_WAITALL)

Hard to tell, but it looks like your server may have run out of threads in the Pyro
threadpool. Either try to increase the size of the threadpool by changing the
appropriate config item(s), or have less 'active' proxy objects in your client code.
Every 'active' proxy connection ties to one thread in the server's thread pool. If
there are no more threads available, Pyro4 will wait till one becomes available again,
before it continues processing new connections. You can 'help out' by releasing unused
proxy objects to free up threads again.

Alternatively, try to switch to the multiplexed server type rather than the default
threadpool server.

Failing all this, then we need a lot more information to be able to figure out what
the problem could be. Pyro4 doesn't have a known "hanging server" bug.

> 
> 2. How do I use the builtin 'open' with flame? For example, when using: fh =
> flame.builtin("open")(r'C:\\test.txt', 'r')
> 
> then, trying to readlines - it complains the file is closed

You can't do this: open file handles are not pickleable and cannot be sent across the
network like this. Unfortunately python doesn't always give a nice error that explains
what's going on, and this is one of the strange cases. Pickling a file object results
in an uninitialized file when it is unpickled again, rather than a PicklingError.

If you want very basic file transfer you could perhaps use Flame's builtin getfile()
method. Or make a Pyro object yourself that has a method to read the file on the
server, and that returns the file's contents rather than the open file handle.


Irmen


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