8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package MyPackage; 25 26 /** 27 * @test 28 * @summary Verifies the JVMTI Heap Monitor Statistics 29 * @build Frame 30 * @compile HeapMonitorStatRateTest.java 31 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorStatRateTest 32 */ 33 34 import java.io.PrintStream; 35 36 public class HeapMonitorStatRateTest { 37 38 static { 39 try { 40 System.loadLibrary("HeapMonitor"); 41 } catch (UnsatisfiedLinkError ule) { 42 System.err.println("Could not load HeapMonitor library"); 43 System.err.println("java.library.path: " 44 + System.getProperty("java.library.path")); 45 throw ule; 46 } 47 } 48 49 native static double getAverageRate(); 50 native static int enableSampling(int rate); 51 native static void disableSampling(); 52 53 public static int cnt; 54 public static int g_tmp[]; 55 public int array[]; 56 57 public static int helper() { 58 int sum = 0; 59 // Let us assume that the array is 24 bytes of memory. 60 for (int i = 0; i < 127000 / 6; i++) { 61 int tmp[] = new int[1]; 62 // Force it to be kept. 63 g_tmp = tmp; 64 sum += g_tmp[0]; 65 } 66 return sum; 67 } 68 69 public static void wrapper() { 70 int sum = 0; 71 for (int j = 0; j < 5000; j++) { 72 sum += helper(); 73 } 74 System.out.println(sum); 75 } 76 77 public static void main(String[] args) { 78 int[] tab = {1024, 16384, 524288}; 79 80 for (int rateIdx = 0; rateIdx < tab.length; rateIdx++) { 81 int rate = tab[rateIdx]; 82 83 enableSampling(rate); 84 wrapper(); 85 disableSampling(); 86 87 double calculatedRate = getAverageRate(); 88 89 double error = rate - calculatedRate; | 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package MyPackage; 25 26 /** 27 * @test 28 * @summary Verifies the JVMTI Heap Monitor sampling rate average 29 * @compile HeapMonitorStatRateTest.java 30 * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorStatRateTest 31 */ 32 33 public class HeapMonitorStatRateTest { 34 static { 35 try { 36 System.loadLibrary("HeapMonitor"); 37 } catch (UnsatisfiedLinkError ule) { 38 System.err.println("Could not load HeapMonitor library"); 39 System.err.println("java.library.path: " 40 + System.getProperty("java.library.path")); 41 throw ule; 42 } 43 } 44 45 private static int g_tmp[]; 46 47 private native static double getAverageRate(); 48 private native static int enableSampling(int rate); 49 private native static void disableSampling(); 50 51 private static int helper() { 52 int sum = 0; 53 // Let us assume that the array is 24 bytes of memory. 54 for (int i = 0; i < 127000 / 6; i++) { 55 int tmp[] = new int[1]; 56 // Force it to be kept. 57 g_tmp = tmp; 58 sum += g_tmp[0]; 59 } 60 return sum; 61 } 62 63 private static void wrapper() { 64 int sum = 0; 65 for (int j = 0; j < 5000; j++) { 66 sum += helper(); 67 } 68 System.out.println(sum); 69 } 70 71 public static void main(String[] args) { 72 int[] tab = {1024, 16384, 524288}; 73 74 for (int rateIdx = 0; rateIdx < tab.length; rateIdx++) { 75 int rate = tab[rateIdx]; 76 77 enableSampling(rate); 78 wrapper(); 79 disableSampling(); 80 81 double calculatedRate = getAverageRate(); 82 83 double error = rate - calculatedRate; |