1 /* |
1 /* |
2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
5 * This code is free software; you can redistribute it and/or modify it |
6 * under the terms of the GNU General Public License version 2 only, as |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
38 public class GetTotalSafepointTime { |
38 public class GetTotalSafepointTime { |
39 |
39 |
40 private static HotspotRuntimeMBean mbean = |
40 private static HotspotRuntimeMBean mbean = |
41 (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean(); |
41 (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean(); |
42 |
42 |
43 private static final long NUM_THREAD_DUMPS = 100; |
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44 |
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45 // Careful with these values. |
43 // Careful with these values. |
46 private static final long MIN_VALUE_FOR_PASS = 1; |
44 private static final long MIN_VALUE_FOR_PASS = 1; |
47 private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE; |
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48 |
45 |
49 private static boolean trace = false; |
46 // Thread.getAllStackTraces() should cause safepoints. |
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47 // If this test is failing because it doesn't, |
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48 // MIN_VALUE_FOR_PASS should be reset to 0 |
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49 public static long executeThreadDumps(long initial_value) { |
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50 long value; |
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51 do { |
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52 Thread.getAllStackTraces(); |
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53 value = mbean.getTotalSafepointTime(); |
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54 } while (value == initial_value); |
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55 return value; |
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56 } |
50 |
57 |
51 public static void main(String args[]) throws Exception { |
58 public static void main(String args[]) throws Exception { |
52 if (args.length > 0 && args[0].equals("trace")) { |
59 long value = executeThreadDumps(0); |
53 trace = true; |
60 System.out.println("Total safepoint time (ms): " + value); |
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61 |
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62 if (value < MIN_VALUE_FOR_PASS) { |
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63 throw new RuntimeException("Total safepoint time " + |
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64 "illegal value: " + value + " ms " + |
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65 "(MIN = " + MIN_VALUE_FOR_PASS + ")"); |
54 } |
66 } |
55 |
67 |
56 // Thread.getAllStackTraces() should cause safepoints. |
68 long value2 = executeThreadDumps(value); |
57 // If this test is failing because it doesn't, |
69 System.out.println("Total safepoint time (ms): " + value2); |
58 // MIN_VALUE_FOR_PASS should be reset to 0 |
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59 for (int i = 0; i < NUM_THREAD_DUMPS; i++) { |
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60 Thread.getAllStackTraces(); |
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61 } |
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62 |
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63 long value = mbean.getTotalSafepointTime(); |
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64 |
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65 if (trace) { |
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66 System.out.println("Total safepoint time (ms): " + value); |
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67 } |
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68 |
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69 if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) { |
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70 throw new RuntimeException("Total safepoint time " + |
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71 "illegal value: " + value + " ms " + |
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72 "(MIN = " + MIN_VALUE_FOR_PASS + "; " + |
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73 "MAX = " + MAX_VALUE_FOR_PASS + ")"); |
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74 } |
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75 |
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76 for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) { |
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77 Thread.getAllStackTraces(); |
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78 } |
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79 long value2 = mbean.getTotalSafepointTime(); |
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80 |
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81 if (trace) { |
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82 System.out.println("Total safepoint time2 (ms): " + value2); |
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83 } |
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84 |
70 |
85 if (value2 <= value) { |
71 if (value2 <= value) { |
86 throw new RuntimeException("Total safepoint time " + |
72 throw new RuntimeException("Total safepoint time " + |
87 "did not increase " + |
73 "did not increase " + |
88 "(value = " + value + "; " + |
74 "(value = " + value + "; " + |