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8081607: Change default GC for server configurations to G1

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For more info see JEP 248.

Reviewed-by: pliden, tschatzl
This commit is contained in:
Stefan Johansson 2015-06-24 08:37:12 +02:00
parent 83a0dd66c5
commit f6a2109bab
2 changed files with 12 additions and 9 deletions
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4
hotspot/src/share/vm/runtime/arguments.cpp
View file

@ -1535,7 +1535,11 @@ void Arguments::select_gc_ergonomically() {
if (should_auto_select_low_pause_collector()) {
FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
} else {
#if defined(JAVASE_EMBEDDED)
FLAG_SET_ERGO(bool, UseParallelGC, true);
#else
FLAG_SET_ERGO(bool, UseG1GC, true);
#endif
}
} else {
FLAG_SET_ERGO(bool, UseSerialGC, true);

17
hotspot/test/gc/arguments/TestSelectDefaultGC.java
View file

@ -36,11 +36,6 @@ import jdk.test.lib.*;
import java.util.regex.*;
public class TestSelectDefaultGC {
public static boolean versionStringContains(OutputAnalyzer output, String pattern) {
Matcher matcher = Pattern.compile(pattern, Pattern.MULTILINE).matcher(output.getStderr());
return matcher.find();
}
public static void assertVMOption(OutputAnalyzer output, String option, boolean value) {
output.shouldMatch(" " + option + " .*=.* " + value + " ");
}
@ -51,14 +46,18 @@ public class TestSelectDefaultGC {
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
boolean isServerVM = versionStringContains(output, "Server VM");
boolean isServerVM = Platform.isServer();
boolean isEmbeddedVM = Platform.isEmbedded();
// Verify GC selection
assertVMOption(output, "UseParallelGC", isServerVM);
assertVMOption(output, "UseParallelOldGC", isServerVM);
// G1 is default for non-embedded server VMs
assertVMOption(output, "UseG1GC", isServerVM && !isEmbeddedVM);
// Parallel is default for embedded server VMs
assertVMOption(output, "UseParallelGC", isServerVM && isEmbeddedVM);
assertVMOption(output, "UseParallelOldGC", isServerVM && isEmbeddedVM);
// Serial is default for non-server VMs
assertVMOption(output, "UseSerialGC", !isServerVM);
assertVMOption(output, "UseConcMarkSweepGC", false);
assertVMOption(output, "UseG1GC", false);
assertVMOption(output, "UseParNewGC", false);
}
}