Method 0 method_calls Method Count true Method Count false <html><p>Displays a count of method calls for the given Java thread. The target JVM must be run with the <font face="Courier">-XX:+ExtendedDTraceProbes</font> option. You can use the <font face="Courier">jinfo</font> command to view and modify JVM options. This display uses the new DTrace probes defined in JDK 6, so you need at least JDK 6 to run this display.</p> <p>Use caution, <font color="red">enabling these extended probes or using this chime display will slow down your application significantly</font>.</p> <p>This chime display needs the JVM pid and also a Thread ID. The Thead ID is the same as the LWP ID. An easy way to find the LWP ID for the thread of interest is to use the prstat command like this</p> <font face="Courier"><br/> prstat -p <i>&lt;JVM pid&gt;</i> -L </font><br/> or <font face="Courier"><br/> prstat -p <i>&lt;JVM pid&gt;</i> -mL </font> <p>For more information, you can see the reference &ldquo;DTrace Probes in HotSpot VM&rdquo; http://java.sun.com/javase/6/docs/technotes/guides/vm/dtrace.html and also the article &ldquo;DTrace and Java: Exposing Performance Problems That Once Were Hidden&rdquo; by Jarod Jenson http://www.devx.com/Java/Article/33943</p></html> Thread ID (LWP ID) false aggsize 16m cleanrate 100ms dynvarsize 512m aggrate 1000ms bufpolicy ring zdefs set /* Written by Steven Reynolds */ this char *str_ptr; this string class_name; this string method_name; this string signature; hotspot$target:::method-entry /tid == $1/ { /* signature */ this->str_ptr = (char*) copyin(arg5, arg6+1); this->str_ptr[arg6] = '\0'; this->signature = (string) this->str_ptr; /* method name */ this->str_ptr = (char*) copyin(arg3, arg4+1); this->str_ptr[arg4] = '\0'; this->method_name = strjoin((string) this->str_ptr,this->signature); /* class name */ this->str_ptr = (char*) copyin(arg1, arg2+1); this->str_ptr[arg2] = '\0'; this->class_name = strjoin((string) this->str_ptr,this->method_name); @method_calls[this->class_name] = count(); /*trunc(@method_calls,20);*/ this->str_ptr = 0; this->class_name = 0; this->method_name = 0; this->signature = 0; } true true 506 517 Java Thread Method calls 2