Reducing memory usage

From Bisq Wiki
Revision as of 19:45, 28 April 2021 by Plebeian9000 (talk | contribs) (Plebeian9000 moved page Reduce JVM MAXRam to Reducing memory usage: make article title for intuitve and discoverable)
Jump to navigation Jump to search

One of the settings Java virtual machines (JVMs) use to calibrate how much physical memory to reserve at startup is MaxRAM, and there is a good chance your JVM's default MaxRAM configuration is too large.

To check the default MaxRAM setting, run this java command:

   java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version | grep MaxRAM

Look for the MaxRAM value (bytes) in the output. An example:

   367: uint64_t MaxRAM = 137438953472 

This means the OpenJDK 11 JVM's MaxRAM setting is 128 GB, on a machine with only 16 GB RAM.

Experiments have shown running Bisq with a 4 GB MaxRAM setting reduces resident memory consumption by more than 50% (when starting a clean Bisq installation with an empty data directory). Setting MaxRAM to 2 GB reduces resident memory usage even more, but setting it any lower (1536m) will result in an OutOfMemoryError and crash the app.

As of version 1.3.2, Bisq is started with a MaxRAM setting of 4 GB. If you are using Bisq v1.3.1 or older, consider upgrading to the latest version to benefit from this change.