[gridftp-user] client debugging

[John Bresnahan]

is the server overloaded?

Jaime Frey wrote:
> On Jul 2, 2008, at 2:25 PM, Jaime Frey wrote:
> 
>> Thanks. The debugging output tells more of what's going on, but I 
>> still don't have a complete picture.
>>
>> Attached below is the output caused by a globus_ftp_client_rmdir(), 
>> with timestamps prepended. I had 50 client processes issuing commands 
>> in parallel, but each client was issuing only one command at a time.
>>
>> The resulting error string was "an end-of-file was reached globus_xio: 
>> An end of file occurred". Out of the 50 clients, 11 failed with this 
>> error. All of them showed similar output to that below, including a 
>> gap of exactly 10 minutes.
>>
>> It's unclear to me why it's stalling in authentication. I'm going to 
>> strace the processes next to pin down what's happening on the wire. In 
>> the meantime, does the output below suggest what's wrong to you?
> 
> 
> Update: Strace reveals the following sequence of events:
> * Client connects to server
> * Server sends '220 Server ready'
> * Client sends 'AUTH GSSAPI'
> * Client selects on read, no data arrives
> * 10 minutes later, client gets EOF on connection
> 
> So it looks like the problem is on the server side.
> 
> +--------------------------------+-----------------------------------+
> |           Jaime Frey           | I used to be a heavy gambler.     |
> |       jfrey at cs.wisc.edu        | But now I just make mental bets.  |
> | http://www.cs.wisc.edu/~jfrey/ | That's how I lost my mind.        |
> +--------------------------------+-----------------------------------+
> 
>