[web2py] Re: Why web2py server hangs/freeze?

[Alfonso Serra]

I have had the exact same problem the server hanged for a minute to get an 
undescriptive IOError.

I have been able to solve it by commenting these lines on one of my models.
from gluon.custom_import import track_changes 
track_changes(True)

wasnt using modules anyway. Hope it helps.



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[web2py] Re: Why web2py server hangs/freeze?

[Narendra Kumar]

setup Script included in web2py, is not working properly. 
I get a nice post, which work 
perfect.(https://www.digitalocean.com/community/tutorials/how-to-deploy-web2py-python-applications-with-uwsgi-and-nginx-on-centos-7)
By using Nginx, web2py working fine from last 4 weeks.

Regards
Narendra


On Thursday, October 12, 2017 at 7:06:15 PM UTC+5:30, Narendra Kumar wrote:
>
> Hi, 
>
> I try to create setup web2py-nginx, using script 
> *setup-web2py-nginx-uwsgi-on-centos.sh* exists in web2py /script folder.
> During setup Error occur and need to stop setup, Below are the few line of 
> error:
>
>
> ---
> gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
> -Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
> Objects/funcobject.o Objects/funcobject.c
> In file included from Include/Python.h:125:0,
>  from Objects/funcobject.c:4:
> Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
> format function type [-Wformat=]
>  PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
> Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
>  ^
> gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
> -Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
> Objects/intobject.o Objects/intobject.c
> In file included from Include/Python.h:125:0,
>  from Objects/intobject.c:4:
> Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
> format function type [-Wformat=]
>  PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
> Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
>  ^
> gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
> -Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
> Objects/iterobject.o Objects/iterobject.c
> In file included from Include/Python.h:125:0,
>  from Objects/iterobject.c:3:
> Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
> format function type [-Wformat=]
>  PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
> Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
>  ^
> gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
> -Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
> Objects/listobject.o Objects/listobject.c
> In file included from Include/Python.h:125:0,
>  from Objects/listobject.c:3:
> Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
> format function type [-Wformat=]
>  PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
> Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
>
>
> ---
>
> I am using OS: 
> *Oracle Linux Server release 7.3*Python:
>
> *Python 2.7.5 (default, Sep  5 2016, 02:30:38)[GCC 4.8.5 
> 20150623 (Red Hat 4.8.5-9)]*And this server is empty, having no other 
> setup/plug-in/application, which may create problem.
>
> Please help.
>
> Regards
> Narendra
>
> On Wednesday, October 11, 2017 at 10:28:49 PM UTC+5:30, Massimo Di Pierro 
> wrote:
>>
>> we stopped recommending and supporting apache long ago. The world has 
>> moved to nginx and so have we.
>> these problems are apache problems not web2py problems and that is why we 
>> stopped supporting it.
>>
>> On Friday, 15 September 2017 00:40:46 UTC-5, Narendra Kumar wrote:
>>>
>>> Hi,
>>>
>>> As suggested in previous posts, I deploy my web2py application on apache 
>>> sever. I use scripts/setup-web2py-debian-sid.sh file to make setup on local 
>>> server, which exists in web2py folder and follow steps defined on URL 
>>> http://web2py.com/books/default/chapter/29/13/deployment-recipes#One-step-production-deployment
>>> .
>>> But Still I get the server down issue.
>>>
>>>
>>> Regards
>>> Narendra
>>>
>>>
>>> On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Yo

[web2py] Re: Why web2py server hangs/freeze?

[Narendra Kumar]

Hi, 

I try to create setup web2py-nginx, using script 
*setup-web2py-nginx-uwsgi-on-centos.sh* exists in web2py /script folder.
During setup Error occur and need to stop setup, Below are the few line of 
error:

---
gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
Objects/funcobject.o Objects/funcobject.c
In file included from Include/Python.h:125:0,
 from Objects/funcobject.c:4:
Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
format function type [-Wformat=]
 PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
 ^
gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
Objects/intobject.o Objects/intobject.c
In file included from Include/Python.h:125:0,
 from Objects/intobject.c:4:
Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
format function type [-Wformat=]
 PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
 ^
gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
Objects/iterobject.o Objects/iterobject.c
In file included from Include/Python.h:125:0,
 from Objects/iterobject.c:3:
Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
format function type [-Wformat=]
 PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);
 ^
gcc -pthread -c -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall 
-Wstrict-prototypes  -I. -IInclude -I./Include  -fPIC -DPy_BUILD_CORE -o 
Objects/listobject.o Objects/listobject.c
In file included from Include/Python.h:125:0,
 from Objects/listobject.c:3:
Include/modsupport.h:27:1: warning: ‘PyArg_ParseTuple’ is an unrecognized 
format function type [-Wformat=]
 PyAPI_FUNC(int) PyArg_ParseTuple(PyObject *, const char *, ...) 
Py_FORMAT_PARSETUPLE(PyArg_ParseTuple, 2, 3);

---

I am using OS: 
*Oracle Linux Server release 7.3*Python:

*Python 2.7.5 (default, Sep  5 2016, 02:30:38)[GCC 4.8.5 
20150623 (Red Hat 4.8.5-9)]*And this server is empty, having no other 
setup/plug-in/application, which may create problem.

Please help.

Regards
Narendra

On Wednesday, October 11, 2017 at 10:28:49 PM UTC+5:30, Massimo Di Pierro 
wrote:
>
> we stopped recommending and supporting apache long ago. The world has 
> moved to nginx and so have we.
> these problems are apache problems not web2py problems and that is why we 
> stopped supporting it.
>
> On Friday, 15 September 2017 00:40:46 UTC-5, Narendra Kumar wrote:
>>
>> Hi,
>>
>> As suggested in previous posts, I deploy my web2py application on apache 
>> sever. I use scripts/setup-web2py-debian-sid.sh file to make setup on local 
>> server, which exists in web2py folder and follow steps defined on URL 
>> http://web2py.com/books/default/chapter/29/13/deployment-recipes#One-step-production-deployment
>> .
>> But Still I get the server down issue.
>>
>>
>> Regards
>> Narendra
>>
>>
>> On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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[web2py] Re: Why web2py server hangs/freeze?

[Massimo Di Pierro]

we stopped recommending and supporting apache long ago. The world has moved 
to nginx and so have we.
these problems are apache problems not web2py problems and that is why we 
stopped supporting it.

On Friday, 15 September 2017 00:40:46 UTC-5, Narendra Kumar wrote:
>
> Hi,
>
> As suggested in previous posts, I deploy my web2py application on apache 
> sever. I use scripts/setup-web2py-debian-sid.sh file to make setup on local 
> server, which exists in web2py folder and follow steps defined on URL 
> http://web2py.com/books/default/chapter/29/13/deployment-recipes#One-step-production-deployment
> .
> But Still I get the server down issue.
>
>
> Regards
> Narendra
>
>
> On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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[web2py] Re: Why web2py server hangs/freeze?

[Dave S]

On Monday, September 11, 2017 at 12:33:38 PM UTC-7, Dave S wrote:
 

> My experience with Rocket locking up happens on AWS linux, somewhere in 
> the cloud. There are both short lockups (about 10 minutes) which are 
> related to a socket error that times out, and indefinite lockups (hours) 
> which I haven't yet associated with a specific problem.  The latter 
> requires a kill the pid, restart the server cycle; at least, I don't have a 
> better fix yet.
>
>
I've gone almost 2 weeks since the last lockup, but had one this morning.  
While it was down, I had a chance to use curl to try connecting, results 
below.

 curl -k -vv -X GET https://myserver.com
* About to connect() to myserver.com port 443 (#0)
*   Trying 52.34.144.39... connected
* Connected to myserver.com (52.34.144.39) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* warning: ignoring value of ssl.verifyhost
* NSS error -5961 (PR_CONNECT_RESET_ERROR)
* Closing connection #0
* SSL connect error
curl: (35) SSL connect error


 /dps

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[web2py] Re: Why web2py server hangs/freeze?

[Dave S]

On Thursday, September 14, 2017 at 10:40:46 PM UTC-7, Narendra Kumar wrote:
>
> Hi,
>
> As suggested in previous posts, I deploy my web2py application on apache 
> sever. I use scripts/setup-web2py-debian-sid.sh file to make setup on local 
> server, which exists in web2py folder and follow steps defined on URL 
> http://web2py.com/books/default/chapter/29/13/deployment-recipes#One-step-production-deployment
> .
> But Still I get the server down issue.
>
>
> Regards
> Narendra
>
>
>> If you're using Apache, then you should be looking in the Apache log 
files to see what it thinks happened.  If you find something in the log 
files that you don't understand, or that you think points to a bug in 
web2py, post that information here and we'll try to help.  (Well, I won't, 
because I'm going the nginx route, not having any existing Apache legacy to 
 live with, but there are several experience Apache users in the group.)

/dps

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[web2py] Re: Why web2py server hangs/freeze?

[Narendra Kumar]

Hi,

As suggested in previous posts, I deploy my web2py application on apache 
sever. I use scripts/setup-web2py-debian-sid.sh file to make setup on local 
server, which exists in web2py folder and follow steps defined on URL 
http://web2py.com/books/default/chapter/29/13/deployment-recipes#One-step-production-deployment.
But Still I get the server down issue.


Regards
Narendra


On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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- http://web2py.com
- http://web2py.com/book (Documentation)
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[web2py] Re: Why web2py server hangs/freeze?

[Dave S]

On Sunday, September 10, 2017 at 10:44:25 PM UTC-7, Narendra Kumar wrote:
>
> Hi Massimo,
>
> Good Morning. And sorry for my poor English.
>

We can adjust; we have people posting from all over (but some of the people 
who learned English later can speak 
better English than some of us native speakers).
 

>
> Q1) 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.
> Ans) Whenever sever freezes/hanged. We try to access our pages from 
> different browser bit still get no response. At that time server never 
> accept any request. The only option is to restart server.
>
> Q2) are using apache? Don't it has memory issues. Use Nginx
> Ans) As I already explained that I am running web2py using python command 
> as mentioned below:. Not usng ang any server as apache/Nginx, etc.
> python web2py.py -a  -c 138c3b68d25b8a7d.crt -k 
> keyfile.key --ca-cert gd_bundle-g2-g1.crt -i  -p 
> 
> [...]
>
 

> Please let me know, I am running web2py directly using python is the 
> problem, if it is, let me know the best server either apache/Nginx that can 
> I use?.
>
>>
>>
An additional question is what OS are you hosting your webserver on, and 
then is it running server hardware, a virtual machine (such as a cloud 
instance), or a laptop?

But I think the core of the issue is that you aren't using NginX.  The 
invocation you give uses the Rocket server packaged with web2py, which is 
fine for development, but 
   * has limited ability to scale for larger traffic loads
   * does seem to have some uptime issues

My experience with Rocket locking up happens on AWS linux, somewhere in the 
cloud. There are both short lockups (about 10 minutes) which are related to 
a socket error that times out, and indefinite lockups (hours) which I 
haven't yet associated with a specific problem.  The latter requires a kill 
the pid, restart the server cycle; at least, I don't have a better fix yet.

If you don't have a specific reason to go with Apache, go with NginX 
instead.  For both, you need to use uwsgi.  Many people deploy with NginX 
with just the setup script shipped with Web2py; be aware that if you have 
real certificates you have to tweak the script to not do the self-signed 
ones, and to point to the right place for the certs.  I am mulling over how 
to generalize this (I use Let's Encrypt), but haven't submitted anything 
yet.

I'm currently taking baby steps at moving to A Real Front End (because I 
have the luxury of being able to deep-dive on this).
For reading material, I found good NginX stuff (I think) on Pakt Pub, 
though it's not free.
https://www.packtpub.com/mapt/book/networking_and_servers/9781782165125/1/ch01lvl1sec04/installation>
https://www.packtpub.com/mapt/book/networking_and_servers/9781785289538/1/ch01lvl1sec09/configuring-nginx>

Free documentation on uswgi is pretty good:
https://uwsgi-docs.readthedocs.io/en/latest/WSGIquickstart.html>

Hope this helps.

Dave S
/dps

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[web2py] Re: Why web2py server hangs/freeze?

[Narendra Kumar]

Hi Massimo,

Good Morning. And sorry for my poor English.

Q1) 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.
Ans) Whenever sever freezes/hanged. We try to access our pages from 
different browser bit still get no response. At that time server never 
accept any request. The only option is to restart server.

Q2) are using apache? Don't it has memory issues. Use Nginx
Ans) As I already explained that I am running web2py using python command 
as mentioned below:. Not usng ang any server as apache/Nginx, etc.
python web2py.py -a  -c 138c3b68d25b8a7d.crt -k 
keyfile.key --ca-cert gd_bundle-g2-g1.crt -i  -p 

Q3) 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
Ans) I am not using session.forget(), as I maintain session expire after 
20min. But 20 min is enough for any process, which perform heavy task.

Q4) are you using sqlite? It does serialize all writes and locks the DB in 
the process. Have you tried postgresql?
Q5) if you are using postgresql, have you checked the database logs? 
Ans 4 & 5) I am using mysql database server only. Initially I think that 
large data process might create problem, but same table with same data 
works fine with PHP and JSF/Icefaces application, server takes time to 
process, but never be down like web2py.



Please let me know, I am running web2py directly using python is the 
problem, if it is, let me know the best server either apache/Nginx that can 
I use?.
Or Can increase memory used by python at runtime?. 

Please help me.

Regards
Narendra Kumar

On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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[web2py] Re: Why web2py server hangs/freeze?

[黄祥]

is put session.forget() at the beginning of the function can make process 
goes faster?
and
move the computation to a background task is same like put it on web2py 
scheduler?

thanks and best regards,
stifan

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[web2py] Re: Why web2py server hangs/freeze?

[Massimo Di Pierro]

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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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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Re: [web2py] Re: Why web2py server hangs/freeze?

[Kiran Subbaraman]

Am not sure what is causing the issue. The debug steps mentioned earlier 
will help you understand what is going on.


I understand you are on 2.14.x.
As an FYI, web2py 2.15.x on wards has deprecated support for python 2.6.
Search for 2.6 mentions on this page: 
https://github.com/web2py/web2py/blob/master/CHANGELOG



Kiran Subbaraman
http://subbaraman.wordpress.com/about/

On 05-Sep-17 10:11 AM, Narendra Kumar wrote:
I did not see any error or any warning in httpserver.log file as well 
as application's log.


Server configuration:

Linux OS = Oracle Linux Server release 6.8
Python =  2.6.6 (r266:84292, Jul 23 2015, 05:13:40) [GCC 4.4.7 
20120313 (Red Hat 4.4.7-16)]
Web2py = 2.14.6-stable+timestamp.2016.05.09.19.18.48 (Running on 
Rocket 1.2.6, Python 2.6.6)


Run web2py by:
python web2py.py -a  -c 138c3b68d25b8a7d.crt -k 
keyfile.key --ca-cert gd_bundle-g2-g1.crt -i 192.168.200.155 -p 443


Thanks
Narendra Kumar

On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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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- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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[web2py] Re: Why web2py server hangs/freeze?

[Narendra Kumar]

I did not see any error or any warning in httpserver.log file as well as 
application's log.

Server configuration:

Linux OS = Oracle Linux Server release 6.8
Python =  2.6.6 (r266:84292, Jul 23 2015, 05:13:40) [GCC 4.4.7 20120313 
(Red Hat 4.4.7-16)]
Web2py = 2.14.6-stable+timestamp.2016.05.09.19.18.48 (Running on Rocket 
1.2.6, Python 2.6.6) 

Run web2py by:
python web2py.py -a  -c 138c3b68d25b8a7d.crt -k keyfile.key 
--ca-cert gd_bundle-g2-g1.crt -i 192.168.200.155 -p 443

Thanks 
Narendra Kumar

On Monday, September 4, 2017 at 7:17:25 PM UTC+5:30, 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
>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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