Initiating Data Collection This section describes how you can modify the scripts used to launch WebLogic servers to enable data collection. Actually, you can match up the output of lwptime. In this case, we choose to name the script collectlaunch. These tools are add-ons to Sun Studio 11.
c" Possible leaks report (possible leaks: 0 total size: 0 bytes) Checking for memory use.
Each Java thread's event callstack is shown with its Java methods.
If it is important to return the trace up until the point of failure, then the analyzer can be modified to return just one instruction at a time. If sample markers are used, the data volume will be higher, but you can filter by sample to look at any part of a run, even parts you thought would be uninteresting when the data was recorded.
The DTrace count() function stores the number of times each user function is called in a process.
Here is the modified version of the pid. h header file which can hold information about the values held in the source and destination registers.
The next step is to select which instructions are to be traced, and what is to be recorded about those instructions. You can use a second signal, SIGUSR1, for example, if you want to both control pause and resume and to insert sample markers in the experiment.
To profile a server, you must ensure that the JVM command launching the server is prepended with a collect command, with appropriate arguments, to invoke the Sun Studio Collector.
Measuring the Performance of Multi-threaded Applications Both DTrace and Sun Studio Collector and Analyzer tools can be used to measure the performance of multi-threaded applications.
The name of each probe is the offset of its corresponding instruction in the function expressed as a hexadecimal integer.
The Analyzer tool displays the data recorded by the Collector in Graphical User Interface (GUI).
In each one, the last step is spawning a JVM to run the server.
This routine takes a list of the instruction types to trace.
Some of the JVM frames represent transition code between interpreted Java, compiled Java, and native code.
The following output is generated if you run the C program in Example 1 with the functime. It also will show the pseudo-functions from JVM overhead threads. For the mechanism to work properly, the signal specified must be one that the user code does not use, and does not explicitly ignore, or set a signal handler for.
so:foo: Infrequent errors can be difficult to debug because they can be difficult to reproduce. Initially, set all functions to some arbitrary color, say gray. You may want to use the date command to generate a string representing the current date and time and embed that string in the experiment name. To specify that it should be intially resumed, append the optional ,r to the signal number or name. From Applications that dlopen a JVM A non-Java application can dynamically open libjvm. d script utilizes the lwp-create, lwp-start, and lwp-exit probes to report useful information about the lwp creation and the time is spent in each lwp.
You may name experiments with a -o argument specifying a name including the name of the server, followed by ".

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