8042310: TestStringDeduplicationMemoryUsage test failing

Reviewed-by: ehelin, jwilhelm

test/gc/g1/TestStringDeduplicationMemoryUsage.java

-/*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/*
- * @test TestStringDeduplicationMemoryUsage
- * @summary Test string deduplication memory usage
- * @bug 8029075
- * @key gc
- * @library /testlibrary
- */
-
-public class TestStringDeduplicationMemoryUsage {
-    public static void main(String[] args) throws Exception {
-        TestStringDeduplicationTools.testMemoryUsage();
-    }
-}

test/gc/g1/TestStringDeduplicationTools.java

@@ -294,55 +294,6 @@ class TestStringDeduplicationTools {
         }
     }
 
-    private static class MemoryUsageTest {
-        public static void main(String[] args) {
-            System.out.println("Begin: MemoryUsageTest");
-
-            final boolean useStringDeduplication = Boolean.parseBoolean(args[0]);
-            final int numberOfStrings = LargeNumberOfStrings;
-            final int numberOfUniqueStrings = 1;
-
-            ArrayList<String> list = createStrings(numberOfStrings, numberOfUniqueStrings);
-            forceDeduplication(DefaultAgeThreshold, FullGC);
-
-            if (useStringDeduplication) {
-                verifyStrings(list, numberOfUniqueStrings);
-            }
-
-            System.gc();
-
-            System.out.println("Heap Memory Usage: " + ManagementFactory.getMemoryMXBean().getHeapMemoryUsage().getUsed());
-            System.out.println("Array Header Size: " + unsafe.ARRAY_CHAR_BASE_OFFSET);
-
-            System.out.println("End: MemoryUsageTest");
-        }
-
-        public static OutputAnalyzer run(boolean useStringDeduplication) throws Exception {
-            String[] extraArgs = new String[0];
-
-            if (useStringDeduplication) {
-                extraArgs = new String[] {
-                    "-XX:+UseStringDeduplication",
-                    "-XX:+PrintStringDeduplicationStatistics",
-                    "-XX:StringDeduplicationAgeThreshold=" + DefaultAgeThreshold
-                };
-            }
-
-            String[] defaultArgs = new String[] {
-                "-XX:+PrintGC",
-                "-XX:+PrintGCDetails",
-                MemoryUsageTest.class.getName(),
-                "" + useStringDeduplication
-            };
-
-            ArrayList<String> args = new ArrayList<String>();
-            args.addAll(Arrays.asList(extraArgs));
-            args.addAll(Arrays.asList(defaultArgs));
-
-            return runTest(args.toArray(new String[args.size()]));
-        }
-    }
-
     /*
      * Tests
      */
@@ -480,44 +431,4 @@ class TestStringDeduplicationTools {
         OutputAnalyzer output = InternedTest.run();
         output.shouldHaveExitValue(0);
     }
-
-    public static void testMemoryUsage() throws Exception {
-        // Test that memory usage is reduced after deduplication
-        OutputAnalyzer output;
-        final String heapMemoryUsagePattern = "Heap Memory Usage: (\\d+)";
-        final String arrayHeaderSizePattern = "Array Header Size: (\\d+)";
-
-        // Run without deduplication
-        output = MemoryUsageTest.run(false);
-        output.shouldHaveExitValue(0);
-        final long heapMemoryUsageWithoutDedup = Long.parseLong(output.firstMatch(heapMemoryUsagePattern, 1));
-        final long arrayHeaderSizeWithoutDedup = Long.parseLong(output.firstMatch(arrayHeaderSizePattern, 1));
-
-        // Run with deduplication
-        output = MemoryUsageTest.run(true);
-        output.shouldHaveExitValue(0);
-        final long heapMemoryUsageWithDedup = Long.parseLong(output.firstMatch(heapMemoryUsagePattern, 1));
-        final long arrayHeaderSizeWithDedup = Long.parseLong(output.firstMatch(arrayHeaderSizePattern, 1));
-
-        // Sanity check to make sure one instance isn't using compressed class pointers and the other not
-        if (arrayHeaderSizeWithoutDedup != arrayHeaderSizeWithDedup) {
-            throw new Exception("Unexpected difference between array header sizes");
-        }
-
-        // Calculate expected memory usage with deduplication enabled. This calculation does
-        // not take alignment and padding into account, so it's a conservative estimate.
-        final long sizeOfChar = unsafe.ARRAY_CHAR_INDEX_SCALE;
-        final long sizeOfCharArray = StringLength * sizeOfChar + arrayHeaderSizeWithoutDedup;
-        final long bytesSaved = (LargeNumberOfStrings - 1) * sizeOfCharArray;
-        final long heapMemoryUsageWithDedupExpected = heapMemoryUsageWithoutDedup - bytesSaved;
-
-        System.out.println("Memory usage summary:");
-        System.out.println("   heapMemoryUsageWithoutDedup:      " + heapMemoryUsageWithoutDedup);
-        System.out.println("   heapMemoryUsageWithDedup:         " + heapMemoryUsageWithDedup);
-        System.out.println("   heapMemoryUsageWithDedupExpected: " + heapMemoryUsageWithDedupExpected);
-
-        if (heapMemoryUsageWithDedup > heapMemoryUsageWithDedupExpected) {
-            throw new Exception("Unexpected memory usage, heapMemoryUsageWithDedup should be less or equal to heapMemoryUsageWithDedupExpected");
-        }
-    }
 }