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Zing with ZST System Requirements

The Zing Runtime for Java is a JDK that implements the umbrella Java Specification Request (JSR) for applicable Java Platform, Standard Edition (Java SE) versions (for example, JSR 336 for Java SE 7); and constitutes a “Compliant Implementation” under the specification licenses for the final release umbrella JSR specifications that Zing implements.

Zing includes dynamic “just-in-time” (JIT) compiler technologies that adaptively compile Java bytecodes into optimized machine instructions, and manages the Java heap using Garbage Collector technology developed by Azul Systems.

Zing is supported on a variety of Linux distributions and x64 processor architectures. A current list of supported Linux operating systems and x64 architecture CPUs is covered in the remaining chapters and Release Notes.

A complete list of applicable Java SE JSRs can be found here:

For Java SE 7 (JSR 336):

For Java SE 8 (JSR 337):

For Java SE 11 (JSR 384):

For Java SE 13 (JSR 388):

Zing Components

Each of the Zing components are installed on machines relative to the ZVM host machine, as listed.

  • ZVM and ZST are installed on the same machine. ZVM requires ZST to use the Zing memory management features. The ZVM package software is packaged as standard .sh, .tar.gz, .rpm, or .deb. The ZST package software is packaged as standard .rpm or .deb.

    Starting with ZVM, ZST is not required. See Zing System Requirements for details.

  • ZVision and ZVRobot are the profiling and diagnostics tools for the ZVM processes. They are automatically installed with the ZVM component.

Zing with ZST Operating System Requirements

This section lists system requirements for operating systems supported by Zing in the Zing Virtual Machine with Zing System Tools mode of operation.

The components ZVM and ZST can be installed on machines running the following operating systems using .rpm or .deb installers, as appropriate:

Operating System Versions
RHEL/CentOS 6, 7, 8
Oracle Linux Server 6, 7
SLES 12 (SP3, SP4, SP5)
Ubuntu 16.04 - 20.04
Debian 9 (Stretch) and 10 (Buster)
Amazon Linux 1, 2
CoreOS 4.13.16

See the complete list of the supported kernels on the Software Downloads and Documents page. You need to obtain a username and password from [email protected] to access the page.


  • Ensure that OpenSSL 0.9.8 or later is installed.
  • Ensure that binutils are installed.
  • Ensure that Python version >= 2.6 and < 3.0 is installed.
  • When you use virtualized platforms, ensure that you follow Azul's guidance for HW compatibility.
  • If your system has been updated to the latest kernels to resolve the Meltdown and Spectre CPU security flaws, install ZST version 5.20.5 or higher for all targets other than SLES 11 SP4, and use ZST 5.20.6 up to ZST 5.22.5 for SLES 11. SP4. SLES 11 SP4 is not supported starting with ZST 5.22.6.

Zing with ZST CPU Requirements

The ZVM and ZST Zing components can be installed on machines running the following CPU types.

  • 64-bit x86 CPUs
    • Intel® Xeon® server class processors released 2009 and later.

    • AMD Opteron™ server class processors released 2010 and later.

  • Zing is supported on systems with 2 or more vCores. Systems with higher core counts are obviously going to scale better, and provide lower scheduling related hiccup/jitter behavior.

Zing with ZST Memory Requirements

The Zing components in the ZVM with ZST mode, require the following amount of RAM on the ZVM machine:

  • 8+ GB RAM recommended
  • 512 MB hard minimum

Zing fundamentally leverages any provided memory across a wide operating range. Zing can fit within in the same resource profile as HotSpot, though unlocks a much higher upper memory limit without adversely affecting pause times.

Zing supports heap sizes from 512 MB to 20 TB.

With virtualized environments, we recommend using at least 7.5 GB of physical memory (for example, EC2 xlarge instances) per instance as minimum.

Cloud Computing Service Supported Instance Virtual Processor(s) RAM
Amazon Web Services t2.medium 2 vCPUs 4 GB or larger
Microsoft Azure Standard_B2s 2 vCPUs 4 GB or larger
Google Cloud Platforms n1-standard-1 1 vCPU 3.75 GB or larger

One of the benefits of Zing's heap management behavior is that larger Java heaps result in better GC efficiency (often much better than HotSpot), without the typical higher-pause-time downsides often found with other JVMs. As a result, we often recommend systematically starting high, then walking down to determine the proper heap size that provides sufficient headroom to allow improved CPU efficiency for Java applications.

Zing supports heap sizes from 512 MB to 20 TB when used with ZST. When used without ZST, the supported heap size ranges from 512 MB to 2.5 TB.

Hard Disk Storage Space Requirements

The Zing components require the following amount of disk space on the ZVM machine.

  • 10 GB free disk drive space recommended for your ZVM instances to run Java applications
  • 8 GB minimum configuration is a spinning platter hard drive or enterprise quality SSD. Installation to a USB flash device is not recommended for production use.
  • 600 MB additional for JDK functions

Zing with ZST Platform Requirements

Zing with the ZST runs on any of the following hardware or virtualized platforms:

  • x86-64 hardware

  • x86-64 virtual machines configured with Intel VT-x or AMD-V (e.g., Amazon EC2 (HVM), Azure, Oracle Virtual Box, Google Compute Engine, VMware)




See Also

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