On 30/11/2014, at 8:40 PM, Steve M <[email protected]> wrote:
> Hi Graham.
>
> Ok, so I basically put:
> import sys, os
> os.system('ulimit -a')
>
> at the top of the wsgi.py file
>
> Then later in def application I put:
> uval = os.system('ulimit -a')
>
> output = ' '
> output += 'os.system = %s\n' % repr(uval)
>
> etc etc
>
> return [output]
> -----
>
> The only relevant information I got was on the page which said:
> os.system = -1
>
> But nothing relevant in error.log file near as I can tell.
The os.system call only returns the exit status and not the output.
The output would have been in the main Apache error log (not virtual host).
That you were getting -1 though suggests that ulimit couldn't even be run
because of hitting the process limit.
Not that I know it to cause issues with starting processes, but some VPS
systems have stupid memory allowances in place.
Have a read of:
http://code.google.com/p/modwsgi/wiki/ApplicationIssues#Memory_Constrained_VPS_Systems
The question though is whether after rebooting the system the issue occurred
straight away? Did you find a large number of processes running?
Graham
> Steve
>
> On Sunday, November 30, 2014 4:12:05 AM UTC-5, Graham Dumpleton wrote:
>
> On 30/11/2014, at 5:59 PM, Steve M <[email protected]> wrote:
>
> > Hello, the problem I am having is that mod_wsgi fails if I set process to
> > anything greater than 1 in the WSGIDaemonProcess process=1
> >
> > This is my current setup:
> > [notice] Apache/2.2.14 (Ubuntu) mod_wsgi/4.4.1 Python/2.7.6 configured --
> > resuming normal operations
> >
> > I compiled mod_wsgi from source.
> >
> > This seems to be the key error, but I am guessing:
> > [alert] (11)Resource temporarily unavailable: mod_wsgi (pid=1287): Couldn't
> > create worker thread 9 in daemon process 'server_site_a'.
> > Several of those pop up in the error log.
> >
> > WSGI settings in virtualhost:
> > WSGIDaemonProcess server_site_a processes=1 threads=10
> > display-name=%{GROUP}
> > WSGIProcessGroup server_site_a
> > WSGIApplicationGroup %{GLOBAL}
> >
> >
> > In main apache2.conf:
> > WSGIRestrictedEmbedded On
> >
> > And mpm_worker_module settings:
> >
> > StartServers 10
> > MaxClients 15
> > MaxRequestsPerChild 256
> >
> > MinSpareThreads 10
> > MaxSpareThreads 20
> > ThreadsPerChild 15
> > ServerLimit 80
> >
> > MaxMemFree 512
> >
> >
> > After watching Grahams videos on making apache suck less for python I took
> > some of his advice
> > and decided to start fiddling with the apache settings.
> > I first started off by getting apache to come up without errors using
> > mpm_worker.
> > Once I had a baseline for apache I started to fiddle with mod_wsgi.
> > So that is how I arrived at the settings.
> >
> > Would appreciate any help.
>
>
> Manual page entry for pthread_create() says:
>
> ERRORS
> pthread_create() will fail if:
>
> [EAGAIN] The system lacked the necessary resources to create
> another thread, or the system-imposed limit on the
> total number of threads in a process
> [PTHREAD_THREADS_MAX] would be exceeded.
>
> This would therefore tend to indicate it is an issue with the limits on the
> user Apache ends up running as, or the system as a whole.
>
> Can you start by putting back to a working configuration and then in a WSGI
> hello world add:
>
> import os
> os.system('ulimit -a')
>
> and hit the URL for the hello world script.
>
> Then get from the log file what that produces.
>
> BTW, appreciate that you are at least trying to make changes as many these
> days just give and stop using mod_wsgi. :-(
>
> If we can sort out what the restriction is, I'll point out a few things which
> still need fixing in what you quote.
>
> Graham
>
>
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