samueldlightfoot opened a new pull request, #286:
URL: https://github.com/apache/cassandra-dtest/pull/286

   Force GC before direct memory measurements for ZGC compatibility
   
   Generational ZGC (JDK 21 default) only processes PhantomReferences during 
major collections, which may not trigger during short test runs. This causes 
DirectByteBuffer Cleaners to not fire, leaving ~63MB of stale direct memory 
that inflates TOTAL_CAPACITY and fails the assertion.
   
   Force System.gc() via nodetool before each measurement to ensure a major 
collection runs and reference processing completes.
   
   CASSANDRA-21182
   
   
   


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