[GR-70922] Switch to SGC with compacting old gen and enable relative code pointers to reduce rss

CHANGELOG.md

@@ -36,6 +36,7 @@ language runtime. The main focus is on user-observable behavior of the engine.
 * Enable FTS3, FTS4, FTS5, RTREE, and math function features in the bundled sqlite3 library.
 * Add support patches for Torch 2.7.0, PyGObject 3.52.3, xmlschema 4.0.0, lxml < 5.4.0, SciPy 1.15, jq 1.8.0, NumPy < 2.3, ormsgpack < 1.9.1, pandas 2.2.3, PyArrow 19.0, PyMuPDF 1.25.4.
 * The GraalPy Native standalone on Linux now uses the G1 garbage collector which is much faster.
+* The GraalPy Native standalone on Linux now uses a lower-footprint Native Image garbage collection configuration. This reduces resident set size (RSS) for many workloads, but may increase startup time and warmup time, and can slow down some workloads.
 * The full-featured Python REPL is now available on GraalPy standalone builds for Windows.
 
 ## Version 24.2.0

mx.graalpython/mx_graalpython.py

@@ -297,16 +297,20 @@ def libpythonvm_build_args():
     if graalos := ("musl" in mx_subst.path_substitutions.substitute("<multitarget_libc_selection>")):
         build_args += ['-H:+GraalOS']
     else:
-        build_args += ["-Dpolyglot.image-build-time.PreinitializeContexts=python"]
+        build_args += [
+            "-Dpolyglot.image-build-time.PreinitializeContexts=python",
+            "-H:+UnlockExperimentalVMOptions",
+            '-H:+RelativeCodePointers',
+            "-H:-UnlockExperimentalVMOptions",
+        ]
 
     if (
-            mx.is_linux()
-            and not graalos
+            not graalos
             and mx_sdk_vm_ng.is_nativeimage_ee()
             and not os.environ.get('NATIVE_IMAGE_AUXILIARY_ENGINE_CACHE')
             and not _is_overridden_native_image_arg("--gc")
     ):
-        build_args += ['--gc=G1', '-H:-ProtectionKeys']
+        build_args += ['-H:-ProtectionKeys']
 
     profile = None
     if (