This question started on SO:
http://serverfault.com/questions/576527/apache-processes-in-top-more-than-maxclients/576600
I've updated my Apache config and mod_wsgi settings, but am still
experiencing memory creep. Here's my site conf and my apache2.conf:
WSGIDaemonProcess mywsgi user=www-data group=www-data processes=5 threads=5
display-name=mod-wsgi
python-path=/home/admin/.virtualenvs/django/lib/python2.7/site-packages
WSGIPythonHome /home/admin/.virtualenvs/django
WSGIRestrictEmbedded On
WSGILazyInitialization On
<VirtualHost 127.0.0.1:8080>
ServerName www.mysite.com
DocumentRoot /srv/mysite
SetEnvIf X-Forwarded-Protocol https HTTPS=1
WSGIScriptAlias / /srv/mysite/system/apache/django.wsgi
process-group= mywsgi application-group=%{GLOBAL}
RequestHeader add X-Queue-Start "%t"
</VirtualHost>
<IfModule mpm_worker_module>
StartServers 1
ThreadsPerChild 5
MinSpareThreads 5
MaxSpareThreads 10
MaxClients 25
ServerLimit 5
MaxRequestsPerChild 0
MaxMemFree 1024
</IfModule>
I'm watching apache and mod_wsgi via htop and apache seems to be playing by
the rules, never loading more than 25 threads. It usually stays around
10-15 threads. We average around 5-6 requests/second monitored by
/server-status/. The thing that's bothering me is that I'm counting 44
mod_wsgi threads in htop. I assumed that since I had processes=5 threads=5
I would only see a maximum of 30 threads below (5 processes + 25 threads).
Partial htop dump:
2249 www-data 20 0 159M 65544 4676 S 26.0 0.8 2:09.93 mod-wsgi
-k start
2248 www-data 20 0 164M 69040 5560 S 148. 0.8 2:10.72 mod-wsgi
-k start
2274 www-data 20 0 159M 65544 4676 S 0.0 0.8 0:12.58 mod-wsgi
-k start
2250 www-data 20 0 157M 62212 5168 S 10.0 0.7 1:50.35 mod-wsgi
-k start
2291 www-data 20 0 164M 69040 5560 S 41.0 0.8 0:17.07 mod-wsgi
-k start
2251 www-data 20 0 165M 69320 4676 S 0.0 0.8 1:59.48 mod-wsgi
-k start
2272 www-data 20 0 159M 65544 4676 S 0.0 0.8 0:28.67 mod-wsgi
-k start
2282 www-data 20 0 165M 69320 4676 S 0.0 0.8 0:33.85 mod-wsgi
-k start
2292 www-data 20 0 164M 69040 5560 S 28.0 0.8 0:28.08 mod-wsgi
-k start
2298 www-data 20 0 157M 62212 5168 S 0.0 0.7 0:14.93 mod-wsgi
-k start
2299 www-data 20 0 157M 62212 5168 S 1.0 0.7 0:23.71 mod-wsgi
-k start
2358 www-data 20 0 164M 69040 5560 S 1.0 0.8 0:02.62 mod-wsgi
-k start
2252 www-data 20 0 165M 70468 4660 S 41.0 0.8 1:55.85 mod-wsgi
-k start
2273 www-data 20 0 159M 65544 4676 S 10.0 0.8 0:29.03 mod-wsgi
-k start
2278 www-data 20 0 159M 65544 4676 S 1.0 0.8 0:02.79 mod-wsgi
-k start
2264 www-data 20 0 165M 70468 4660 S 0.0 0.8 0:07.50 mod-wsgi
-k start
2266 www-data 20 0 165M 70468 4660 S 25.0 0.8 0:39.49 mod-wsgi
-k start
2300 www-data 20 0 157M 62212 5168 S 6.0 0.7 0:28.78 mod-wsgi
-k start
2265 www-data 20 0 165M 70468 4660 S 15.0 0.8 0:31.44 mod-wsgi
-k start
2294 www-data 20 0 164M 69040 5560 R 54.0 0.8 0:34.82 mod-wsgi
-k start
2279 www-data 20 0 165M 69320 4676 S 0.0 0.8 0:32.63 mod-wsgi
-k start
2297 www-data 20 0 157M 62212 5168 S 3.0 0.7 0:09.68 mod-wsgi
-k start
2302 www-data 20 0 157M 62212 5168 S 0.0 0.7 0:27.62 mod-wsgi
-k start
2323 www-data 20 0 157M 62212 5168 S 0.0 0.7 0:02.56 mod-wsgi
-k start
2280 www-data 20 0 165M 69320 4676 S 0.0 0.8 0:13.00 mod-wsgi
-k start
2263 www-data 20 0 165M 70468 4660 S 0.0 0.8 0:19.35 mod-wsgi
-k start
2322 www-data 20 0 165M 69320 4676 S 0.0 0.8 0:03.05 mod-wsgi
-k start
2275 www-data 20 0 165M 70468 4660 S 0.0 0.8 0:02.72 mod-wsgi
-k start
2285 www-data 20 0 164M 69040 5560 S 0.0 0.8 0:00.00 mod-wsgi
-k start
2288 www-data 20 0 164M 69040 5560 S 0.0 0.8 0:00.11 mod-wsgi
-k start
2290 www-data 20 0 164M 69040 5560 S 4.0 0.8 0:15.66 mod-wsgi
-k start
2293 www-data 20 0 164M 69040 5560 S 20.0 0.8 0:29.01 mod-wsgi
-k start
2268 www-data 20 0 159M 65544 4676 S 0.0 0.8 0:00.00 mod-wsgi
-k start
2269 www-data 20 0 159M 65544 4676 S 0.0 0.8 0:00.11 mod-wsgi
-k start
2270 www-data 20 0 159M 65544 4676 S 15.0 0.8 0:26.62 mod-wsgi
-k start
2271 www-data 20 0 159M 65544 4676 S 0.0 0.8 0:26.55 mod-wsgi
-k start
Last night I had processes=3 threads=3 and my NR capacity report reported
100% usage
(https://rpm.newrelic.com/accounts/67402/applications/1132078/optimize/capacity_analysis),
so I upped it to processes=5 threads=5 and now I have 44 threads going.
Despite the instance count reported by NR staying relatively stable, memory
consumption continues to increase
(https://rpm.newrelic.com/accounts/67402/servers/1130000/processes#id=152494639).
I realize that nobody except for Graham can see those NR reports, sorry.
Has anyone dealt with this situation before?
Mark
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