1 #!/usr/sbin/dtrace -CZs 2 /* 3 * j_cpudist.d - measure Java on-CPU times for different types of operation. 4 * Written for the Java hotspot DTrace provider. 5 * 6 * $Id: j_cpudist.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 are only visible when using the 10 * flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile 11 * 12 * USAGE: j_cpudist.d [top] # hit Ctrl-C to end 13 * 14 * The "top" optional argument will truncate the output for each report 15 * section to that many lines, with a default of 10. 16 * 17 * FIELDS: 18 * 1 Process ID 19 * 2 Type of call (method/gc) 20 * 3 Name of call 21 * 22 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 23 * 24 * CDDL HEADER START 25 * 26 * The contents of this file are subject to the terms of the 27 * Common Development and Distribution License, Version 1.0 only 28 * (the "License"). You may not use this file except in compliance 29 * with the License. 30 * 31 * You can obtain a copy of the license at Docs/cddl1.txt 32 * or http://www.opensolaris.org/os/licensing. 33 * See the License for the specific language governing permissions 34 * and limitations under the License. 35 * 36 * CDDL HEADER END 37 * 38 * 09-Sep-2007 Brendan Gregg Created this. 39 */ 40 41 #define TOP 10 /* default output truncation */ 42 #define B_FALSE 0 43 44 #pragma D option quiet 45 #pragma D option defaultargs 46 47 dtrace:::BEGIN 48 { 49 printf("Tracing... Hit Ctrl-C to end.\n"); 50 top = $1 != 0 ? $1 : TOP; 51 } 52 53 hotspot*:::method-entry 54 { 55 self->depth[arg0]++; 56 self->exclude[arg0, self->depth[arg0]] = 0; 57 self->method[arg0, self->depth[arg0]] = vtimestamp; 58 } 59 60 hotspot*:::method-return 61 /self->method[arg0, self->depth[arg0]]/ 62 { 63 this->oncpu_incl = vtimestamp - self->method[arg0, self->depth[arg0]]; 64 this->oncpu_excl = this->oncpu_incl - 65 self->exclude[arg0, self->depth[arg0]]; 66 self->method[arg0, self->depth[arg0]] = 0; 67 self->exclude[arg0, self->depth[arg0]] = 0; 68 69 this->class = (char *)copyin(arg1, arg2 + 1); 70 this->class[arg2] = '\0'; 71 this->method = (char *)copyin(arg3, arg4 + 1); 72 this->method[arg4] = '\0'; 73 this->name = strjoin(strjoin(stringof(this->class), "."), 74 stringof(this->method)); 75 76 @types_incl[pid, "method", this->name] = 77 quantize(this->oncpu_incl / 1000); 78 @types_excl[pid, "method", this->name] = 79 quantize(this->oncpu_excl / 1000); 80 81 self->depth[arg0]--; 82 self->exclude[arg0, self->depth[arg0]] += this->oncpu_incl; 83 } 84 85 hotspot*:::gc-begin 86 { 87 self->gc = vtimestamp; 88 self->full = (boolean_t)arg0; 89 } 90 91 hotspot*:::gc-end 92 /self->gc/ 93 { 94 this->oncpu = vtimestamp - self->gc; 95 96 @types[pid, "gc", self->full == B_FALSE ? "GC" : "Full GC"] = 97 quantize(this->oncpu / 1000); 98 99 self->gc = 0; 100 self->full = 0; 101 } 102 103 dtrace:::END 104 { 105 trunc(@types, top); 106 printf("\nTop %d on-CPU times (us),\n", top); 107 printa(" PID=%d, %s, %s %@d\n", @types); 108 109 trunc(@types_excl, top); 110 printf("\nTop %d exclusive method on-CPU times (us),\n", top); 111 printa(" PID=%d, %s, %s %@d\n", @types_excl); 112 113 trunc(@types_incl, top); 114 printf("\nTop %d inclusive method on-CPU times (us),\n", top); 115 printa(" PID=%d, %s, %s %@d\n", @types_incl); 116 } 117