maksaska commented on code in PR #13413:
URL: https://github.com/apache/ignite/pull/13413#discussion_r3957784062
##########
modules/ducktests/tests/ignitetest/services/utils/jvm_utils.py:
##########
@@ -17,25 +17,85 @@
This module contains JVM utilities.
"""
+import re
+
from ignitetest.services.utils.decorators import memoize
DEFAULT_HEAP = "768M"
-JVM_PARAMS_GC_G1 = "-XX:+UseG1GC -XX:MaxGCPauseMillis=100 " \
- "-XX:ConcGCThreads=$(((`nproc`/3)>1?(`nproc`/3):1)) " \
- "-XX:ParallelGCThreads=$(((`nproc`*3/4)>1?(`nproc`*3/4):1))
"
+GC_G1 = "G1"
+GC_PARALLEL = "PARALLEL"
+GC_SERIAL = "SERIAL"
+GC_Z = "ZGC"
+GC_SHENANDOAH = "SHENANDOAH"
+
+DEFAULT_GC = GC_G1
+
+# NOTE: these strings are interpolated into a shell command that is evaluated
on the remote
+# node (see IgniteSpec._jvm_opts and IgniteNodeSpec.command), which is what
makes the `nproc`
+# substitutions work. Consequently NO option here may contain spaces or quotes.
+_NPROC_THIRD = "$(((`nproc`/3)>1?(`nproc`/3):1))"
+_NPROC_THREE_QUARTERS = "$(((`nproc`*3/4)>1?(`nproc`*3/4):1))"
+
+# Garbage collector profiles. A profile is a mutually exclusive group: it both
selects the collector
+# and carries the tuning flags that are meaningful for it. Never mix flags
across profiles.
+GC_PROFILES = {
+ GC_G1: [
+ "-XX:+UseG1GC",
+ "-XX:MaxGCPauseMillis=100",
+ f"-XX:ConcGCThreads={_NPROC_THIRD}",
+ f"-XX:ParallelGCThreads={_NPROC_THREE_QUARTERS}",
+ "-XX:+UseStringDeduplication", # G1-only until JDK 18, hence part of
the profile
+ ],
+ GC_PARALLEL: [
+ "-XX:+UseParallelGC",
+ f"-XX:ParallelGCThreads={_NPROC_THREE_QUARTERS}",
+ # deliberately NO MaxGCPauseMillis: it flips ParallelGC into adaptive
pause-goal sizing
+ ],
+ GC_SERIAL: [
+ "-XX:+UseSerialGC",
+ ],
+ GC_Z: [
+ "-XX:+UseZGC", # product feature since JDK 15, no unlock flag needed
+ f"-XX:ConcGCThreads={_NPROC_THIRD}",
+ f"-XX:ParallelGCThreads={_NPROC_THREE_QUARTERS}",
+ ],
+ GC_SHENANDOAH: [
+ "-XX:+UseShenandoahGC", # product feature since JDK 15; OpenJDK only,
not Oracle JDK
+ f"-XX:ConcGCThreads={_NPROC_THIRD}",
+ f"-XX:ParallelGCThreads={_NPROC_THREE_QUARTERS}",
+ ],
+}
JVM_PARAMS_GENERIC = "-server -XX:+DisableExplicitGC -XX:+AlwaysPreTouch " \
"-XX:+ParallelRefProcEnabled -XX:+DoEscapeAnalysis " \
- "-XX:+OptimizeStringConcat -XX:+UseStringDeduplication"
+ "-XX:+OptimizeStringConcat"
+
+# Matches a collector selector like -XX:+UseZGC. Deliberately narrow: it must
not match
+# -XX:+DisableExplicitGC or -XX:+UseStringDeduplication.
+_GC_SELECTOR_PATTERN = re.compile(r"^-XX:([+-])(Use\w+GC)$")
+
+
+class MultipleGcSelectedError(Exception):
+ """
+ Raised when JVM options end up selecting more than one garbage collector.
+ """
-def create_jvm_settings(heap_size=DEFAULT_HEAP, gc_settings=JVM_PARAMS_GC_G1,
generic_params=JVM_PARAMS_GENERIC,
+def create_jvm_settings(heap_size=DEFAULT_HEAP, gc_settings=None,
generic_params=JVM_PARAMS_GENERIC,
gc_dump_path=None, oom_path=None, vm_error_path=None):
"""
Provides settings string for JVM process.
- param opts: JVM options to merge. Adds new or rewrites default values. Can
be list or string.
+ :param heap_size: value for both -Xmx and -Xms.
+ :param gc_settings: garbage collector options, see GC_PROFILES. Can be
list or string.
+ Defaults to the DEFAULT_GC profile.
+ :param generic_params: collector-independent options. Can be list or
string.
"""
+ gc_settings = GC_PROFILES[DEFAULT_GC] if gc_settings is None else
gc_settings
+
+ if isinstance(gc_settings, str):
Review Comment:
Can you elaborate?
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