Client requirements

The following web browsers are supported for the XL Release user interface:

  • Chrome
  • Firefox
  • Internet Explorer 11 or later

Note: Internet Explorer Compatibility View is not supported.

Server requirements

To install the XL Release server, the following prerequisites must be met:

  • XL Release license: See XL Release licensing
  • Operating system: Microsoft Windows or a Unix-family operating system
  • Java SE Development Kit (JDK):
    • For XL Release 4.8.0 and later: JDK 1.8.0_25 or later
    • For XL Release 4.7.x and earlier: JDK 7 (Oracle or IBM)

Server hardware requirements

  • Multicore CPU
  • RAM: 4-6 GB of RAM available for the XL Release process. Note: Allocating more than 6 GB to the XL Release process does not show significant performance improvements.
  • Hard disk: XL Release must be installed on a hard drive that is persistent, but not NFS. Hard disk usage depends on configuration of the product. At least 100 GB of storage is recommended for the default installation that runs an embedded database. Use a fast hard drive.

External systems

Reference setup

The server that XebiaLabs uses for reference has:

  • Two Quad Intel(R) Xeon(R) CPU E5450 @ 3.00GHz
  • 16 GB of RAM
  • Two 300 GB 10K SAS 2.5” disks

It is configured as follows:

Operating system CentOS Linux 7.2
Installed software A single XL Release instance running as a service, and monitoring systems
XL Release version 6.1.0
XL Release mode Standalone, non-clustered
XL Release persistence Embedded Derby, local file system (out-of-the-box settings)
Java version Oracle JDK 1.8.0_74

The relevant configuration settings are:

Parameter Value Location Description -Xms1024m -Xmx4096m XL_RELEASE_SERVER_HOME/conf/xlr-wrapper-linux.conf Sets the heap size to minimum 1 GB and maximum 4 GB
threads.max 125 XL_RELEASE_SERVER_HOME/conf/xl-release-server.conf Sets the maximum number of HTTP threads to 125
xl.executors.scheduler.maxThreadsCount 50 XL_RELEASE_SERVER_HOME/conf/xl-release.conf Sets the maximum number of threads for asynchronous operations to 50
xl.repository.jackrabbit.bundleCacheSize 256 XL_RELEASE_SERVER_HOME/conf/xl-release.conf Sets the JCR cache size to 256 MB

This configuration supports up to 100 concurrent users running a test set with 200 active releases, 200 templates and 500 completed releases, with a mean response time less then 3 seconds.

Note: Other configuration settings may be optimal for your environment (external database, shared filesystem, hot-standby) and load profile (number of concurrent users, release structure).