Re: Emacs Hangs on Filesystem Operations on Stale NFS

[Alexander Shukaev <emacs@alexander.shukaev.name>]

On 2018-06-11 14:40, Andreas Schwab wrote:
> On Jun 11 2018, Alexander Shukaev <emacs@alexander.shukaev.name> wrote:
> 
>> signal.signal(signal.SIGALRM, alarm_handler)
>> signal.alarm(3)
>> try:
>>   proc = subprocess.call('stat ' + path,
>>                shell=True,
>>                stderr=subprocess.PIPE,
>>                stdout=subprocess.PIPE)
>>   stdoutdata, stderrdata = proc.communicate()
>>   signal.alarm(0)
>> except Alarm:
>>   print "Timed out after 3 seconds..."
> 
> How do you know that 3 seconds is enough?
> 
> Andreas.

You don't know.  You just decide that it's maximum tolerable for 
you/your setup/hardware/connection/preferences/whatever, otherwise you 
are 99.(9)% sure that something is wrong somewhere with your system, but 
you don't give up your Emacs instance for that and rather get indicated 
that there might be a potential problem.

P.S. How did people know that 2 hours would be enough for TCP keepalive?