Java, Semeru Runtimes and Runtimes for Business

Java, Semeru Runtimes and Runtimes for Business

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Java 8 vs Java 21 in IMS: An Internal Performance Study

  • 1.  Java 8 vs Java 21 in IMS: An Internal Performance Study

    Posted 06/24/26 03:17 PM

    Curious whether upgrading from IBM Java 8 to Semeru Runtimes v21 actually delivers real performance gains in IMS on z/OS environments? In this insightful study by @Prasanth sarode, the team dives deep into side‑by‑side testing of both Java versions under identical IMS workloads, examining critical factors like CPU efficiency, transaction response times, and zIIP offloading. The results offer practical, data‑driven insights into how modern Java performs in mixed Java‑COBOL transaction flows, and what that means for modernization decisions on IBM Z. If you're evaluating a move to Java 21 or want to understand the real impact on IMS performance, this blog is a must‑read. 

    https://community.ibm.com/community/user/blogs/prasanth-sarode/2026/06/17/java-8-vs-java-21-in-ims-an-internal-performance-s