From OpenSCADAWiki
Environment of the programs and services
The program environment uses in common the OS Linux distribution Debian 7 (Wheezy). For external services isolation and some other purposes there used the OpenVZ lightweight isolation in different Virtual Private Servers (VPS). In the most VPSes there used also the Linux distributive Debian 7 (Wheezy), sometime there used Debian 8 (Jessie) and ALTLinux T6. The hardware server (HS) is the x86_64 program environment though the VPSes use mostly the x86_32 environment especially in the demanding tasks, as the result of that we have overall memory consumption of the server about 1.2GB instead 2GB of an even-functional x86_64 pure environment. The program environment structure shown in Figure 1.