Memory Consumption
==================

What follows are readings taken from the staging server about memory consumption
for RhodeCode, RabbitMQ and Apache, and overall system memory.

The readings have been performed using the following tools and commands:

    pmap -d $process_pid
    sync && echo 3 > /proc/sys/vm/drop_caches

In case of swap space, the previous command could be run also as:

    swapoff -a && sync && echo 3 > /proc/sys/vm/drop_caches && swapon -a

Keep in mind that there needs to be sufficient memory to allow swap space to be
moved there.

Tools like top, htop or ps are not precise enough to get a clear picture of real
Linux memory consumptions.

The readings have been performed in 3 different moments, with normal website
operation, and with CI jobs cloning repositories from the server.

RhodeCode
---------

mapped: 1742036K    writeable/private: 1090156K    shared: 124980K
mapped: 2758760K    writeable/private: 1090216K    shared: 1141648K
mapped: 3307952K    writeable/private: 1121856K    shared: 1611184K

Memory at the beginning:

mapped: 654168K     writeable/private: 97948K      shared: 16K

Readings done with 7 CI jobs running, and while browsing the website on
multiple tabs.

mapped: 6740572K    writeable/private: 5208744K    shared: 551248K
mapped: 6757908K    writeable/private: 5226660K    shared: 551248K
mapped: 6912412K    writeable/private: 5392572K    shared: 551248K
mapped: 7081752K    writeable/private: 5561912K    shared: 551248K
mapped: 7290300K    writeable/private: 5770460K    shared: 551248K

RabbitMQ
--------

mapped: 2135512K    writeable/private: 84448K    shared: 0K
mapped: 2135512K    writeable/private: 84448K    shared: 0K
mapped: 2135512K    writeable/private: 84448K    shared: 0K

Apache
------

mapped: 81692K    writeable/private: 3036K    shared: 788K
mapped: 81692K    writeable/private: 3036K    shared: 788K
mapped: 81692K    writeable/private: 3036K    shared: 788K

System Memory
-------------

             total       used       free     shared    buffers     cached
Mem:      15339668    1340244   13999424          0        848      27136
-/+ buffers/cache:    1312260   14027408

Mem:      15339668    1340356   13999312          0        704      27204
-/+ buffers/cache:    1312448   14027220

Mem:      15339668    1372744   13966924          0        164      27932
-/+ buffers/cache:    1344648   13995020

Mem:      15339668   13342380    1997288          0        872    3097056
-/+ buffers/cache:   10244452    5095216

Memory before starting any CI jobs, after kernel chaces have been synced and
dropped:

Mem:      15339668    5613396    9726272          0        852     203456
-/+ buffers/cache:    5409088    9930580

Memory with 7 CI jobs running, and while browsing the website:

Mem:      15339668   11064988    4274680          0        184    2332424
-/+ buffers/cache:    8732380    6607288

After jobs ran, and with no load on the server:

Mem:      15339668    7907532    7432136          0       6680    2501044
-/+ buffers/cache:    5399808    9939860