OpenPBS vs Quartz Scheduler

OpenPBS schedules jobs and manages workloads in high-performance computing environments, including clusters, clouds, and supercomputers. Its policy-driven scheduling balances job turnaround time and system utilization while selecting job placements. The system is designed for millions of cores and has been tested beyond 50,000 nodes. A plugin framework provides administration visibility and supports customized extensions. Health checks monitor faults and can mitigate them automatically; the fail-over architecture is designed to avoid a single point of failure and keep jobs running through failures. OpenPBS is self-hosted and free under the AGPL 3.0 open-source license, while PBS Pro is also dual licensed commercially. Public-sector organizations such as academic and research facilities generally choose the open-source license. Community help comes through a volunteer forum, without a guarantee of answers or bug fixes. OpenPBS is integrated into the OpenHPC software stack. The installation guide states that SELinux is not supported, and critical and high security fixes are delivered in the next major release.

Quartz Scheduler is a free, open-source Java library for running application tasks at scheduled times or on recurring plans. Triggers can use times, days, calendar exclusions, repeat counts, end dates or intervals. Quartz says it can handle workloads from tens to tens of thousands of jobs, with JTA transaction and clustering support. It can run inside an application, an application server or servlet container, as a standalone RMI program, or as a cluster of standalone programs. JDBCJobStore persists jobs and triggers in a relational database, while RAMJobStore keeps them in memory and loses them between executions. Data sources can come from JDBC, application-server JNDI or custom ConnectionProvider implementations. Built-in clustering depends on JDBCJobStore persistence. Downloads list version 2.5.1 for Java 11+ with the jakarta namespace and 2.4.1 for Java 8 with javax.*. Quartz describes itself as a scheduler rather than a job queue, although it can serve as one at small scale. It is licensed under Apache License 2.0.