High-load environments

Tuning EVA ICS

To use EVA ICS in high-load environments, remember the following:

  • Always turn off trace and debug logs. These can significantly slows down all EVA ICS components.

  • Always check logs. In case of BUS queue overflow, the core may get slower, external services may be continuously disconnected. Consider increasing queue size in eva/config/bus, increase queue size in services’ configuration as well (bus/queue_size). This helps to cope with high-load peaks.

  • Use buf_ttl_sec properties of database and replication services to send events in bulk. Same (buf_ttl) can be used for HMI web sockets.

  • Set instant_save: false in eva/config/core.

  • If action history is not required, set keep-action-history in eva/config/core to zero to disable it.

  • For slow channels, always use compressed bulk events in Replication service. Consider using PSRT instead of MQTT, as it is designed to cope with slow channel.

  • Consider splitting the node and move high-loaded services to other neighbor computers.

  • Move inventory to an external SQL database (edit eva/config/core and set inventory_db path). The inventory must be re-deployed after.

  • For heavy-loaded services, use Local clustering and secondary points.


Thanks to EVA ICS architecture and optimization for modern multi-core CPUs, the platform can provide good results even on a microcomputers.

According to tests, EVA ICS can show worse performance on industrial and micro computers if they have:

  • small amount of RAM (minimum 128 MB is recommended)

  • slow SSD drive or SD card.

We strongly recommend using at least UHS-I SD cards which can show a speed up to 100 MB/s. For machines small amount of RAM, consider undeploying all unnecessary services, including the default ones.