Hi ,
I have a problem with mod_wsgi (3.4-14) / Apache 2.4.12 / cx_oracle 5.2 /
Oracle 12 / Django 1.8.2 hanging under bigger load.
The configuration was used for the last several month in dev / testing.
Now when deployed to production environment Apache hangs after couple of
minutes under bigger load (it works fine with small or moderate load).
I have a cluster of 3 Django/Apache/mod_wsgi servers and when this problems
happens each server stops responding (one by one) within 5 - 15 minutes.
Here is my configuration
I am using Python 3.3 and Apache 2.4.12 and mod_wsgi-3.4-14 from Red Hat
(6.7) Software Collection
Apache Virtual Host
<VirtualHost *:8080>
...
WSGIDaemonProcess app.prod processes=2 threads=25 display-name=%{GROUP}
user=MY_USER python-path=MY_PATH
WSGIProcessGroup app.prod
WSGIScriptAlias / /opt/hosts/app/app/wsgi.py
</VirtualHost>
Apache version
Server version: Apache/2.4.12 (Red Hat)
Server built: Aug 11 2015 08:12:59
Server's Module Magic Number: 20120211:41
Server loaded: APR 1.5.1, APR-UTIL 1.5.4
Compiled using: APR 1.5.1, APR-UTIL 1.5.4
Architecture: 64-bit
Server MPM: worker
threaded: yes (fixed thread count)
forked: yes (variable process count)
Server compiled with....
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=256
-D HTTPD_ROOT="/opt/rh/httpd24/root/etc/httpd"
-D SUEXEC_BIN="/opt/rh/httpd24/root/usr/sbin/suexec"
-D DEFAULT_PIDLOG="/opt/rh/httpd24/root/var/run/httpd/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
python33-mod_wsgi-3.4-14.el6.x86_64
Django db configuration
'default': {
'ENGINE': 'django.db.backends.oracle',
'NAME': 'DB_NAME',
'USER': 'webuser',
'PASSWORD': 'webpassword',
'HOST': '',
'PORT': '',
'CONN_MAX_AGE': None,
'OPTIONS': {
'threaded': True,
},
},
[root@taseapp-em1-02 ~]# pstack 17044
Thread 4 (Thread 0x7fb6ffb4b700 (LWP 17053)):
#0 0x00007fb70cf90423 in select () from /lib64/libc.so.6
#1 0x00007fb70d488535 in apr_sleep () from
/opt/rh/httpd24/root/usr/lib64/libapr-1-httpd24.so.0
#2 0x00007fb7021d4340 in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#3 0x00007fb70d24aa51 in start_thread () from /lib64/libpthread.so.0
#4 0x00007fb70cf979ad in clone () from /lib64/libc.so.6
Thread 3 (Thread 0x7fb6ff14a700 (LWP 17054)):
#0 0x00007fb70cf90423 in select () from /lib64/libc.so.6
#1 0x00007fb70d488535 in apr_sleep () from
/opt/rh/httpd24/root/usr/lib64/libapr-1-httpd24.so.0
#2 0x00007fb7021d3ffb in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#3 0x00007fb70d24aa51 in start_thread () from /lib64/libpthread.so.0
#4 0x00007fb70cf979ad in clone () from /lib64/libc.so.6
Thread 2 (Thread 0x7fb6fe749700 (LWP 17055)):
#0 0x00007fb70d2519b8 in fcntl () from /lib64/libpthread.so.0
#1 0x00007fb70d47b3a2 in ?? () from
/opt/rh/httpd24/root/usr/lib64/libapr-1-httpd24.so.0
#2 0x00007fb7021de4d8 in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#3 0x00007fb70d24aa51 in start_thread () from /lib64/libpthread.so.0
#4 0x00007fb70cf979ad in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7fb70e6e57e0 (LWP 17044)):
#0 0x00007fb70cf8e183 in poll () from /lib64/libc.so.6
#1 0x00007fb70d484480 in apr_poll () from
/opt/rh/httpd24/root/usr/lib64/libapr-1-httpd24.so.0
#2 0x00007fb7021d8cf7 in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#3 0x00007fb7021d9b51 in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#4 0x00007fb7021df017 in ?? () from
/opt/rh/httpd24/root/etc/httpd/modules/mod_python33-wsgi.so
#5 0x00007fb70e73d4f9 in ap_run_post_config ()
#6 0x00007fb70e71c78f in main ()
If I reduce the number of mod_wsgi then the problem goes away but the
performance is not acceptable
WSGIDaemonProcess app.prod processes=4 threads=1 display-name=%{GROUP}
user=MY_USER python-path=MY_PATH
Could anybody suggest what could be the cause or how could I debug it
please?
Thanks,
Lukasz
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