# JEP 523: which collector does the JVM pick when you do not choose one?
# Same class files, same vendor (Amazon Corretto), same 2 GB memory limit. Only the JDK version and the CPU limit change.

=== amazoncorretto:26  --cpus=1 --memory=2g
$ docker run --rm --cpus=1 --memory=2g amazoncorretto:26 java -cp /app GcReport
java.version      = 26.0.2.1
availableCpus     = 1
maxHeapMB         = 511
collector beans   = Copy, MarkSweepCompact
UseG1GC           = false (origin DEFAULT)
UseSerialGC       = true  (origin ERGONOMIC)
UseParallelGC     = false (origin DEFAULT)

=== amazoncorretto:27  --cpus=1 --memory=2g
$ docker run --rm --cpus=1 --memory=2g amazoncorretto:27 java -cp /app GcReport
java.version      = 27
availableCpus     = 1
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: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)