JDK-8236847 introduced --enable-compatible-cds-alignment so that the CDS archive can be portable between different machines that have the same the same CPU architecture but different sizes for os::vm_allocation_granularity().

However, --enable-compatible-cds-alignment is disabled by default. People who create a JDK may not be aware of this option. As a result, CDS may become unintentionally disabled.

Since the overhead of --enable-compatible-cds-alignment is small (CDS archive file size increases for ~64KB for linux/aarch64, 16KB for macos/x64, zero elsewhere), it should be enabled by default.