xref: /src/external/cddl/dtracetoolkit/dist/Docs/Examples/j_events_example.txt

The following are examples of j_events.d.

This counts events from all Java processes on the system with hotspot
provider support (1.6.0). Some events such as method calls are only visible
when using the flag "+ExtendedDTraceProbes". eg, 
java -XX:+ExtendedDTraceProbes classfile

Here you can see it running while the program Code/Java/Func_abc

# j_events.d
Tracing... Hit Ctrl-C to end.
^C

    PID  EVENT                                   COUNT
 311379  AttachCurrentThread-entry                   1
 311379  AttachCurrentThread-return                  1
 311379  CallIntMethod-entry                         1
 311379  CallIntMethod-return                        1
 311379  CallStaticBooleanMethod-entry               1
 311379  CallStaticBooleanMethod-return              1
 311379  CallStaticObjectMethod-entry                1
 311379  CallStaticObjectMethod-return               1
 311379  CallStaticObjectMethodV-entry               1
 311379  CallStaticObjectMethodV-return              1
 311379  CallStaticVoidMethod-entry                  1
 311379  CallStaticVoidMethod-return                 1
 311379  CreateJavaVM-entry                          1
 311379  CreateJavaVM-return                         1
 311379  DestroyJavaVM-entry                         1
 311379  DestroyJavaVM-return                        1
 311379  DetachCurrentThread-entry                   1
 311379  DetachCurrentThread-return                  1
 311379  ExceptionCheck-entry                        1
 311379  ExceptionCheck-return                       1
 311379  ExceptionClear-entry                        1
 311379  ExceptionClear-return                       1
 311379  GetDefaultJavaVMInitArgs-entry              1
 311379  GetDefaultJavaVMInitArgs-return             1
 311379  GetJavaVM-entry                             1
 311379  GetJavaVM-return                            1
 311379  GetStringRegion-entry                       1
 311379  GetStringRegion-return                      1
 311379  NewByteArray-entry                          1
 311379  NewByteArray-return                         1
 311379  NewObject-entry                             1
 311379  NewObject-return                            1
 311379  NewObjectV-entry                            1
 311379  NewObjectV-return                           1
 311379  SetBooleanField-entry                       1
 311379  SetBooleanField-return                      1
 311379  ToReflectedMethod-entry                     1
 311379  ToReflectedMethod-return                    1
 311379  vm-init-begin                               1
 311379  vm-init-end                                 1
 311379  vm-shutdown                                 1
 311379  NewGlobalRef-entry                          2
 311379  NewGlobalRef-return                         2
 311379  monitor-wait                                2
 311379  GetStaticFieldID-entry                      3
 311379  GetStaticFieldID-return                     3
 311379  NewObjectArray-entry                        3
 311379  NewObjectArray-return                       3
 311379  SetStaticObjectField-entry                  3
 311379  SetStaticObjectField-return                 3
 311379  GetStaticMethodID-entry                     4
 311379  GetStaticMethodID-return                    4
 311379  EnsureLocalCapacity-entry                   5
 311379  EnsureLocalCapacity-return                  5
 311379  SetByteArrayRegion-entry                    5
 311379  SetByteArrayRegion-return                   5
 311379  SetLongField-entry                          5
 311379  SetLongField-return                         5
 311379  GetMethodID-entry                           6
 311379  GetMethodID-return                          6
 311379  GetObjectArrayElement-entry                 6
 311379  GetObjectArrayElement-return                6
 311379  GetSuperclass-entry                         6
 311379  GetSuperclass-return                        6
 311379  thread-start                                6
 311379  SetIntField-entry                           8
 311379  SetIntField-return                          8
 311379  GetArrayLength-entry                        9
 311379  GetArrayLength-return                       9
 311379  GetByteArrayRegion-entry                    9
 311379  GetByteArrayRegion-return                   9
 311379  RegisterNatives-entry                       9
 311379  RegisterNatives-return                      9
 311379  GetObjectClass-entry                       10
 311379  GetObjectClass-return                      10
 311379  FindClass-entry                            11
 311379  FindClass-return                           11
 311379  SetObjectArrayElement-entry                12
 311379  SetObjectArrayElement-return               12
 311379  GetStringUTFLength-entry                   18
 311379  GetStringUTFLength-return                  18
 311379  GetStringUTFRegion-entry                   18
 311379  GetStringUTFRegion-return                  18
 311379  GetFieldID-entry                           21
 311379  GetFieldID-return                          21
 309790  CallStaticVoidMethod-entry                 24
 309790  CallStaticVoidMethod-return                24
 194441  CallStaticVoidMethod-entry                 26
 194441  CallStaticVoidMethod-return                26
 311379  GetStringUTFChars-entry                    29
 311379  GetStringUTFChars-return                   29
 311379  ReleaseStringUTFChars-entry                29
 311379  ReleaseStringUTFChars-return               29
 311379  CallObjectMethod-entry                     30
 311379  CallObjectMethod-return                    30
 311379  GetStringCritical-entry                    35
 311379  GetStringCritical-return                   35
 311379  ReleaseStringCritical-entry                35
 311379  ReleaseStringCritical-return               35
 311379  ExceptionOccurred-entry                    46
 311379  ExceptionOccurred-return                   46
 311379  GetStringLength-entry                      54
 311379  GetStringLength-return                     54
 311379  NewStringUTF-entry                         54
 311379  NewStringUTF-return                        54
 311379  NewString-entry                            55
 311379  NewString-return                           55
 311379  GetObjectField-entry                       60
 311379  GetObjectField-return                      60
 311379  DeleteLocalRef-entry                      108
 311379  DeleteLocalRef-return                     108
 311379  class-loaded                              327
 311379  object-alloc                             5389
 311379  method-return                           12024
 311379  method-entry                            12031

You can see that nearly all of the events recorded are from PID 311379, which
we can assume in this case is the program in question.  Not all of the lines
correspond to this, however, which is something to be aware of while analysing
the results.