Let's rule out the usual culprits:

- when you saying it hangs are your trying from a new incognito window or 
from the same browser? It may be a session lock not a freeze.
- are using apache? Don't it has memory issues. Use Nginx
- do you have processes that may take a lot of time? consider adding 
session.forget() at the beginning of those actions and/or move the 
computation to a background task
- are you using sqlite? It does serialize all writes and locks the DB in 
the process. Have you tried postgresql?
- if you are using postgresql, have you checked the database logs? 

Massimo


On Monday, 4 September 2017 08:47:25 UTC-5, Narendra Kumar wrote:
>
> Hi,
>
> I stuck on the problem, as web2py server freezes/hang frequently. Almost 
> daily. 
> I tried to track the reason, but I did not get any possible reason. 
> Because I think this happen due to large amount of data processing and 
> create file with large data or try to download big files. But later I found 
> that It freezes/hangs any time.
>
> Please help me.
>
> Regards
> Narendra Kumar
>

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