1 #!/usr/sbin/dtrace -Zs 2 /* 3 * j_stat.d - Java operation stats using DTrace. 4 * Written for the Java hotspot DTrace provider. 5 * 6 * $Id: j_stat.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $ 7 * 8 * This traces activity from all Java processes on the system with hotspot 9 * provider support (1.6.0). Method calls and object allocation are only 10 * visible when using the flag "+ExtendedDTraceProbes". eg, 11 * java -XX:+ExtendedDTraceProbes classfile 12 * 13 * USAGE: j_stat.d [interval [count]] 14 * 15 * FIELDS: 16 * EXEC/s Java programs executed per second, including 17 * those without Java provider support 18 * THREAD/s Threads created, per second 19 * METHOD/s Methods called, per second 20 * OBJNEW/s Objects created, per second 21 * CLOAD/s Class loads, per second 22 * EXCP/s Exceptions raised, per second 23 * GC/s Garbage collects, per second 24 * 25 * The numbers are per second counts for the interval specified. The default 26 * interval is 1 second. 27 * 28 * If you see a count in "EXECS" but not in the other columns, then your 29 * Java software is probably not running with the DTrace hotspot provider. 30 * 31 * If you see counts in "CLOAD" but not in "METHODS", then you Java 32 * software probably isn't running with "+ExtendedDTraceProbes". 33 * 34 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 35 * 36 * CDDL HEADER START 37 * 38 * The contents of this file are subject to the terms of the 39 * Common Development and Distribution License, Version 1.0 only 40 * (the "License"). You may not use this file except in compliance 41 * with the License. 42 * 43 * You can obtain a copy of the license at Docs/cddl1.txt 44 * or http://www.opensolaris.org/os/licensing. 45 * See the License for the specific language governing permissions 46 * and limitations under the License. 47 * 48 * CDDL HEADER END 49 * 50 * 09-Sep-2007 Brendan Gregg Created this. 51 */ 52 53 #pragma D option quiet 54 #pragma D option defaultargs 55 56 inline int SCREEN = 21; 57 58 dtrace:::BEGIN 59 { 60 execs = threads = methods = objnew = cload = gc = exception = 0; 61 lines = SCREEN + 1; 62 interval = $1 ? $1 : 1; 63 counts = $2 ? $2 : -1; 64 secs = interval; 65 first = 1; 66 } 67 68 profile:::tick-1sec 69 { 70 secs--; 71 } 72 73 /* 74 * Print Header 75 */ 76 dtrace:::BEGIN, 77 profile:::tick-1sec 78 /first || (secs == 0 && lines > SCREEN)/ 79 { 80 printf("%-20s %6s %8s %8s %8s %8s %6s %6s\n", "TIME", "EXEC/s", 81 "THREAD/s", "METHOD/s", "OBJNEW/s", "CLOAD/s", "EXCP/s", "GC/s"); 82 lines = 0; 83 first = 0; 84 } 85 86 /* 87 * Tally Data 88 */ 89 proc:::exec-success 90 /execname == "java"/ 91 { 92 execs++; 93 } 94 95 hotspot*:::thread-start 96 { 97 threads++; 98 } 99 100 hotspot*:::method-entry 101 { 102 methods++; 103 } 104 105 hotspot*:::object-alloc 106 { 107 oalloc++; 108 } 109 110 hotspot*:::class-loaded 111 { 112 cload++; 113 } 114 115 hotspot*:::gc-begin 116 { 117 gc++; 118 } 119 120 hotspot*:::ExceptionOccurred-entry 121 { 122 exception++; 123 } 124 125 /* 126 * Print Output 127 */ 128 profile:::tick-1sec 129 /secs == 0/ 130 { 131 printf("%-20Y %6d %8d %8d %8d %8d %6d %6d\n", walltimestamp, 132 execs / interval, threads / interval, methods / interval, 133 oalloc / interval, cload / interval, exception / interval, 134 gc / interval); 135 execs = threads = methods = oalloc = cload = gc = exception = 0; 136 secs = interval; 137 lines++; 138 counts--; 139 } 140 141 /* 142 * End 143 */ 144 profile:::tick-1sec 145 /counts == 0/ 146 { 147 exit(0); 148 } 149