#!/usr/sbin/dtrace -Zs /* * j_stat.d - Java operation stats using DTrace. * Written for the Java hotspot DTrace provider. * * $Id: j_stat.d,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ * * This traces activity from all Java processes on the system with hotspot * provider support (1.6.0). Method calls and object allocation are only * visible when using the flag "+ExtendedDTraceProbes". eg, * java -XX:+ExtendedDTraceProbes classfile * * USAGE: j_stat.d [interval [count]] * * FIELDS: * EXEC/s Java programs executed per second, including * those without Java provider support * THREAD/s Threads created, per second * METHOD/s Methods called, per second * OBJNEW/s Objects created, per second * CLOAD/s Class loads, per second * EXCP/s Exceptions raised, per second * GC/s Garbage collects, per second * * The numbers are per second counts for the interval specified. The default * interval is 1 second. * * If you see a count in "EXECS" but not in the other columns, then your * Java software is probably not running with the DTrace hotspot provider. * * If you see counts in "CLOAD" but not in "METHODS", then you Java * software probably isn't running with "+ExtendedDTraceProbes". * * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. * * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at Docs/cddl1.txt * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * CDDL HEADER END * * 09-Sep-2007 Brendan Gregg Created this. */ #pragma D option quiet #pragma D option defaultargs inline int SCREEN = 21; dtrace:::BEGIN { execs = threads = methods = objnew = cload = gc = exception = 0; lines = SCREEN + 1; interval = $1 ? $1 : 1; counts = $2 ? $2 : -1; secs = interval; first = 1; } profile:::tick-1sec { secs--; } /* * Print Header */ dtrace:::BEGIN, profile:::tick-1sec /first || (secs == 0 && lines > SCREEN)/ { printf("%-20s %6s %8s %8s %8s %8s %6s %6s\n", "TIME", "EXEC/s", "THREAD/s", "METHOD/s", "OBJNEW/s", "CLOAD/s", "EXCP/s", "GC/s"); lines = 0; first = 0; } /* * Tally Data */ proc:::exec-success /execname == "java"/ { execs++; } hotspot*:::thread-start { threads++; } hotspot*:::method-entry { methods++; } hotspot*:::object-alloc { oalloc++; } hotspot*:::class-loaded { cload++; } hotspot*:::gc-begin { gc++; } hotspot*:::ExceptionOccurred-entry { exception++; } /* * Print Output */ profile:::tick-1sec /secs == 0/ { printf("%-20Y %6d %8d %8d %8d %8d %6d %6d\n", walltimestamp, execs / interval, threads / interval, methods / interval, oalloc / interval, cload / interval, exception / interval, gc / interval); execs = threads = methods = oalloc = cload = gc = exception = 0; secs = interval; lines++; counts--; } /* * End */ profile:::tick-1sec /counts == 0/ { exit(0); }