23 |
23 |
24 /* |
24 /* |
25 * @test TestFullGCount.java |
25 * @test TestFullGCount.java |
26 * @bug 7072527 |
26 * @bug 7072527 |
27 * @summary CMS: JMM GC counters overcount in some cases |
27 * @summary CMS: JMM GC counters overcount in some cases |
28 * @run main/othervm -XX:+UseConcMarkSweepGC TestFullGCCount |
28 * @run main/othervm -XX:+PrintGC TestFullGCCount |
29 * |
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30 */ |
29 */ |
31 import java.util.*; |
30 import java.util.*; |
32 import java.lang.management.*; |
31 import java.lang.management.*; |
33 |
32 |
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33 /* |
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34 * Originally for a specific failure in CMS, this test now monitors all |
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35 * collectors for double-counting of collections. |
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36 */ |
34 public class TestFullGCCount { |
37 public class TestFullGCCount { |
35 |
38 |
36 public String collectorName = "ConcurrentMarkSweep"; |
39 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); |
37 |
40 |
38 public static void main(String [] args) { |
41 public static void main(String[] args) { |
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42 int iterations = 20; |
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43 boolean failed = false; |
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44 String errorMessage = ""; |
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45 HashMap<String, List> counts = new HashMap<String, List>(); |
39 |
46 |
40 TestFullGCCount t = null; |
47 // Prime the collection of count lists for all collectors. |
41 if (args.length==2) { |
48 for (int i = 0; i < collectors.size(); i++) { |
42 t = new TestFullGCCount(args[0], args[1]); |
49 GarbageCollectorMXBean collector = collectors.get(i); |
43 } else { |
50 counts.put(collector.getName(), new ArrayList<Long>(iterations)); |
44 t = new TestFullGCCount(); |
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45 } |
51 } |
46 System.out.println("Monitoring collector: " + t.collectorName); |
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47 t.run(); |
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48 } |
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49 |
52 |
50 public TestFullGCCount(String pool, String collector) { |
53 // Perform some gc, record collector counts. |
51 collectorName = collector; |
54 for (int i = 0; i < iterations; i++) { |
52 } |
55 System.gc(); |
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56 addCollectionCount(counts, i); |
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57 } |
53 |
58 |
54 public TestFullGCCount() { |
59 // Check the increments: |
55 } |
60 // Old gen collectors should increase by one, |
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61 // New collectors may or may not increase. |
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62 // Any increase >=2 is unexpected. |
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63 for (String collector : counts.keySet()) { |
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64 System.out.println("Checking: " + collector); |
56 |
65 |
57 public void run() { |
66 for (int i = 0; i < iterations - 1; i++) { |
58 int count = 0; |
67 List<Long> theseCounts = counts.get(collector); |
59 int iterations = 20; |
68 long a = theseCounts.get(i); |
60 long counts[] = new long[iterations]; |
69 long b = theseCounts.get(i + 1); |
61 boolean diffAlways2 = true; // assume we will fail |
70 if (b - a >= 2) { |
62 |
71 failed = true; |
63 for (int i=0; i<iterations; i++) { |
72 errorMessage += "Collector '" + collector + "' has increment " + (b - a) + |
64 System.gc(); |
73 " at iteration " + i + "\n"; |
65 counts[i] = getCollectionCount(); |
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66 if (i>0) { |
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67 if (counts[i] - counts[i-1] != 2) { |
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68 diffAlways2 = false; |
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69 } |
74 } |
70 } |
75 } |
71 } |
76 } |
72 if (diffAlways2) { |
77 if (failed) { |
73 throw new RuntimeException("FAILED: System.gc must be incrementing count twice."); |
78 System.err.println(errorMessage); |
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79 throw new RuntimeException("FAILED: System.gc collections miscounted."); |
74 } |
80 } |
75 System.out.println("Passed."); |
81 System.out.println("Passed."); |
76 } |
82 } |
77 |
83 |
78 private long getCollectionCount() { |
84 private static void addCollectionCount(HashMap<String, List> counts, int iteration) { |
79 long count = 0; |
85 for (int i = 0; i < collectors.size(); i++) { |
80 List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); |
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81 List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); |
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82 for (int i=0; i<collectors.size(); i++) { |
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83 GarbageCollectorMXBean collector = collectors.get(i); |
86 GarbageCollectorMXBean collector = collectors.get(i); |
84 String name = collector.getName(); |
87 List thisList = counts.get(collector.getName()); |
85 if (name.contains(collectorName)) { |
88 thisList.add(collector.getCollectionCount()); |
86 System.out.println(name + ": collection count = " |
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87 + collector.getCollectionCount()); |
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88 count = collector.getCollectionCount(); |
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89 } |
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90 } |
89 } |
91 return count; |
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92 } |
90 } |
93 |
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94 } |
91 } |
95 |
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