Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

2026-09-21 13:55:46 +00:00
commit eecdf0e444
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+# The other half of the old rule: memory. The old heuristic wanted at least 2 CPUs AND about 1792 MB.
+# With 2 CPUs the CPU half of the rule is satisfied, so only the memory limit differs between these runs.
+
+=== amazoncorretto:26  --cpus=2 --memory=1g
+$ docker run --rm --cpus=2 --memory=1g amazoncorretto:26 java -cp /app GcReport
+java.version      = 26.0.2.1
+availableCpus     = 2
+maxHeapMB         = 255
+collector beans   = Copy, MarkSweepCompact
+UseG1GC           = false (origin DEFAULT)
+UseSerialGC       = true  (origin ERGONOMIC)
+UseParallelGC     = false (origin DEFAULT)
+
+=== amazoncorretto:27  --cpus=2 --memory=1g
+$ docker run --rm --cpus=2 --memory=1g amazoncorretto:27 java -cp /app GcReport
+java.version      = 27
+availableCpus     = 2
+maxHeapMB         = 256
+collector beans   = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
+UseG1GC           = true  (origin ERGONOMIC)
+UseSerialGC       = false (origin DEFAULT)
+UseParallelGC     = false (origin DEFAULT)
+
+=== amazoncorretto:26  --cpus=2 --memory=2g
+$ docker run --rm --cpus=2 --memory=2g amazoncorretto:26 java -cp /app GcReport
+java.version      = 26.0.2.1
+availableCpus     = 2
+maxHeapMB         = 512
+collector beans   = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
+UseG1GC           = true  (origin ERGONOMIC)
+UseSerialGC       = false (origin DEFAULT)
+UseParallelGC     = false (origin DEFAULT)
+
+=== amazoncorretto:27  --cpus=2 --memory=2g
+$ docker run --rm --cpus=2 --memory=2g amazoncorretto:27 java -cp /app GcReport
+java.version      = 27
+availableCpus     = 2
+maxHeapMB         = 512
+collector beans   = G1 Young Generation, G1 Concurrent GC, G1 Old Generation
+UseG1GC           = true  (origin ERGONOMIC)
+UseSerialGC       = false (origin DEFAULT)
+UseParallelGC     = false (origin DEFAULT)
+