Measurement and sampling
The splat tool takes as input an AIX® trace log file or (for an SMP trace) a set of log files, and preferably a names file produced by the gennames or gensyms command.
The procedure for generating these files is shown in the trace section.
When you run trace, you will usually use the flag -J splat to
capture the events analyzed by splat (or without the -J flag,
to capture all events). The significant trace hooks are shown in the
following table:
| Hook ID | Event name | Event explanation |
|---|---|---|
| 106 | HKWD_KERN_DISPATCH | The thread is dispatched from the run queue to a processor. |
| 10C | HKWD_KERN_IDLE | The idle process is been dispatched. |
| 10E | HKWD_KERN_RELOCK | One thread is suspended while another is dispatched; the ownership of a RunQ lock is transferred from the first to the second. |
| 112 | HKWD_KERN_LOCK | The thread attempts to secure a kernel lock; the sub-hook shows what happened. |
| 113 | HKWD_KERN_UNLOCK | A kernel lock is released. |
| 134 | HKWD_SYSC_EXECVE | An exec supervisor call (SVC) has been issued by a (forked) process. |
| 139 | HKWD_SYSC_FORK | A fork SVC has been issued by a process. |
| 419 | HKWD_CPU_PREEMPT | A process has been preempted. |
| 465 | HKWD_SYSC_CRTHREAD | A thread_create SVC has been issued by a process. |
| 46D | HKWD_KERN_WAITLOCK | The thread is enqueued to wait on a kernel lock. |
| 46E | HKWD_KERN_WAKEUPLOCK | A thread has been awakened. |
| 606 | HKWD_PTHREAD_COND | Operations on a Condition Variable. |
| 607 | HKWD_PTHREAD_MUTEX | Operations on a Mutex. |
| 608 | HKWD_PTHREAD_RWLOCK | Operations on a Read/Write Lock. |
| 609 | HKWD_PTHREAD_GENERAL | Operations on a PThread. |