Nuclos tuning: performance, tmpfs, hugepages, JVM options, PostgreSQL, VirtIO, VirtualBox, Docker, Vagrant, Linux.

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Tuning for nerds

Advanced performance ideas – tmpfs, JVM/hugepages, PostgreSQL tuning and VirtIO for virtual machines.

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The following suggestions are a collection of ideas (mostly for Linux) aimed at advanced users with solid Java and OS knowledge. Always verify that a change actually improves performance in your setup.

Linux

/tmp on tmpfs: beneficial especially for development with Eclipse and the compile-time AspectJ weaver.
Java VM tuning: review JVM options; consider enabling hugepages for the JVM, PostgreSQL and Oracle.
PostgreSQL: kernel-level tuning and PG cookbook recommendations.

Virtualization

VirtualBox, Docker (lightweight Linux containers) and Vagrant (repeatable environments). If Windows runs as a VirtualBox VM, the VirtIO (virtio-net) network driver increases throughput and lowers CPU load:

Mount the VirtIO driver ISO (storage → IDE CD).
Network → Advanced → Adapter type → Paravirtualized network (virtio-net).
Restart the VM and update the network driver from the ISO in the device manager.
Unmount the ISO afterwards.

Related pages

Configuring Nuclos for high user load

Load.

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Tomcat administration

Tomcat.

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