Download as PDF, PPTX
![Aggregate
@name[key] = aggfunc(args)
@: aggregation’s prefix
name: aggregation’s name
key: D expression list (comma-separated)
aggfunc: aggregation function](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-40-2048.jpg)
![aggr-count.d
01 syscall::read:entry
02 {
03 @counts[execname] = count();
04 }
05 profile:::tick-5s
06 {
07 exit(0);
08 }](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-42-2048.jpg)
![aggr-quant.d
01 syscall::read:entry
02 {
03 self->ts = timestamp;
04 }
05 syscall::read:return
06 /self->ts/
07 {
08 delta = timestamp - self->ts;
09 @quanttime[execname] = quantize(delta);
10 }
11 profile:::tick-5s
12 {
13 exit(0);
14 }](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-43-2048.jpg)
![http-server.d
01 BEGIN
02 {
03 printf("%7s %2s %5s %20s (%5s) %8s %s (%s)n",
04 "WHO", "FD", "RPORT", "REMOTE", "BUFFR",
05 "METHOD", "URL", "FWDFOR");
06 }
07
08 node*:::http-server-request
09 {
10 printf("+SERVER %2d %5d %20s (%5d) %8s %s (%s)n",
11 args[1]->fd, args[1]->remotePort, args[1]->remoteAddress,
12 args[1]->bufferSize,
13 args[0]->method, args[0]->url, args[0]->forwardedFor);
14 }
15
16 node*:::http-server-response
17 {
18 printf("-SERVER %2d %5d %20s (%5d)n",
19 args[0]->fd, args[0]->remotePort, args[0]->remoteAddress,
20 args[0]->bufferSize);
21 }](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-55-2048.jpg)
![request-count.d
01 http-server-request
02 {
03 @[args[0]->url]=count()
04 }](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-56-2048.jpg)
![profile.d
01 profile-97
02 /execname == "node" && arg1/
03 {
04 @[jstack(150, 8000)] = count();
05 }
06 tick-10sec
07 {
08 exit(0);
09 }](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-58-2048.jpg)
![01 dtp.fire("probe1", function(p) {
02 return [1, 2];
03 });
04 dtp.fire("probe2", function(p) {
05 return ["hello, dtrace via provider", "foo"];
06 });](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-66-2048.jpg)
![interval.js
01 var d = require('dtrace-provider');
interval.js
02 var dtp =
03 d.createDTraceProvider('nodeapp');
04 var p2 = dtp.addProbe('echo', 'char *');
05
06 function interval(msg) {
07 dtp.fire('echo', function () {
08 return [msg];
09 });
10 console.log(msg);
11 }
12 setInterval(function() {
13 interval('Hello Dtrace');
14 }, 1000);
15 dtp.enable();](https://image.slidesharecdn.com/learning-dtrace-121121112324-phpapp02/75/Learning-Dtrace-69-2048.jpg)
Uploaded byJeongHun Byeon
Learning Dtrace
DTrace is a comprehensive dynamic tracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. It provides probes in the operating system and applications to monitor events, collects and aggregates data, and provides tools to analyze the data. DTrace can be used on Unix-like systems like Solaris, Linux, macOS, and in Node.js applications through a DTrace provider. It allows gathering insights about the system and application behavior without restarting or slowing the system.
Learning Dtrace
- 1.
- 2. DTrace is a comprehensive dynamictracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. http://dtrace.org/blogs/about/dtracepony/
- 3. DTrace is a comprehensive dynamictracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. http://dtrace.org/blogs/about/dtracepony/
- 4. DTrace is a comprehensive dynamictracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. http://dtrace.org/blogs/about/dtracepony/
- 5. DTrace is a comprehensive dynamictracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. http://dtrace.org/blogs/about/dtracepony/
- 6. DTrace is a comprehensive dynamictracing framework created by Sun Microsystems for troubleshooting kernel and application problems on production systems in real time. http://dtrace.org/blogs/about/dtracepony/
- 7. Bryan Cantrill Mike Shapiro AdamLeventhal http://www.flickr.com/photos/ghost_of_kuji/370072145
- 8. Originally 2003 developed for
- 9. Open-sourced in 2005 http://www.flickr.com/photos/tinou/171803338
- 10. Ported to Unix-like systems http://www.flickr.com/photos/epu/4299657320
- 11. MIT Technology Review 2005 “Innovators Under 35” http://www2.technologyreview.com/tr35/profile.aspx?trid=91
- 12. Technology Innovation Awards 2006 Gold Winner http://www.dowjones.com/innovation/ei_winners_2006.html
- 13. STUG award 2008 https://www.usenix.org/about/stug
- 14.
- 16. Probe 코드가 실행되는 지점 동적으로생성 프로덕션에서 사용가능
- 17. Probe List: sudo dtrace -l
- 18.
- 19. Probe를 제공하는 곳 (ex: syscall, profile)
- 20. Unix 모듈이나 Probe의 어플리케이션 라이브러리의 이름
- 21. Probe가 존재하는 함수의 이름
- 22.
- 23. sudo dtrace -l-n PROBE이름
- 24. sudo dtrace -l-f FUNCTION
- 25. sudo dtrace -l-P PROVIDER
- 26. sudo dtrace -l-m MODULE
- 27.
- 28. Features .d 확장자 컴파일해서 커널레벨에서실행 안전성을 위한 유효성 검사 프로덕션에서 안전하게 실행
- 29. DScript Output Dtrace User Kernel DProgram
- 30. 01 probe-description 02 /optional predicate/ 03 { 04 action statements; 05 }
- 31. provider:module:function:name (ex: syscall:::entry) 01 probe-description 02 /optional predicate/ 03 { 04 action statements; 05 }
- 32. 01 probe-description 02 /optional predicate/ 03 { 04 action statements; 05 } 시스템의 상태를 수집하는 명령문
- 33. 01 probe-description 02 /optional predicate/ 03 { 0이 아니거나 true면 action 수행 04 action statements; 05 }
- 34. begin-end.d 01 BEGIN 02 { 03 trace("begin the beguine"); 04 exit(0); 05 } 06 END 07 { 08 trace("that's all..."); 09 }
- 35. begin-end.d 01 BEGIN 02 { 03 trace("begin the beguine"); 04 exit(0); 05 sudo dtrace -s begin-end.d } 06 END 07 { 08 trace("that's all..."); 09 }
- 36. timer.d 01 profile:::tick-5sec 02 { 03 trace("5sec timer"); 04 } 05 profile:::tick-800msec 06 { 07 trace("800msec timer"); 08 }
- 37. beer.d 01 int bottles; 02 BEGIN 03 { bottles = 5; } 04 profile:::tick-1sec 05 /bottles >= 0/ 06 { 07 printf("%d bottles on the walln", bottles); 08 printf("%d bottles.n", bottles); 09 printf("take one down, pass it aroundn"); 10 printf("%d bottles on the wallnn", bottles); 11 bottles--; 12 } 13 profile:::tick-1sec 14 /bottles < 0/ 15 { exit(0); } 16 END 17 { printf("that's all..."); }
- 38. No Flow Control noif-else no loop ?: operator is exist
- 39. process.d 01 proc:::exec-success 02 { 03 printf("%s", execname); 04 }
- 40. Aggregate @name[key] = aggfunc(args) @:aggregation’s prefix name: aggregation’s name key: D expression list (comma-separated) aggfunc: aggregation function
- 41. Aggregate Function count() :호출횟수 sum(expr) : 표현식의 전체 값 avg(expr) : 표현식의 평균 min(expr) : 표현식 중 가장 작은 값 max(expr) : 표현식 중 가장 큰 값 quantize(expr) : 2제곱의 빈도분포 lquantize(expr,lower-bound, upper- bound, step-value) : 선형 빈도분포
- 42. aggr-count.d 01 syscall::read:entry 02 { 03 @counts[execname] = count(); 04 } 05 profile:::tick-5s 06 { 07 exit(0); 08 }
- 43. aggr-quant.d 01 syscall::read:entry 02 { 03 self->ts = timestamp; 04 } 05 syscall::read:return 06 /self->ts/ 07 { 08 delta = timestamp - self->ts; 09 @quanttime[execname] = quantize(delta); 10 } 11 profile:::tick-5s 12 { 13 exit(0); 14 }
- 44.
- 45. OS Requirements -Dtrace -ustack helper http://www.flickr.com/photos/abandonedhero/3404826467
- 46. User-Level Statically DefinedTracing USDT landed in node v0.6.7
- 47. Full features work onOpenSolaris http://www.flickr.com/photos/jepoirrier/2043728206
- 48. Mac OS Dtrace ustack helper
- 49. Linux Dtrace ustack helper
- 50. Windows Dtrace ustack helper
- 51. node.js is compiledwith --with-dtrace http://www.flickr.com/photos/vectorlyme/206472613
- 52. “SunOS에서 활성화되지만 다른시스템에선 동작하지 않는다”
- 53. Dtrace with node.js onSmartOS of Joyent Demo
- 54. server.js 01 var http = require('http'); 02 http.createServer(function(req, res) { 03 res.writeHead(200, { 04 'Content-Type': 'text/plain' 05 }); 06 res.end('Hello Worldn'); 07 }).listen(8124); 08 09 console.log('Server running!');
- 55. http-server.d 01 BEGIN 02 { 03 printf("%7s %2s %5s %20s (%5s) %8s %s (%s)n", 04 "WHO", "FD", "RPORT", "REMOTE", "BUFFR", 05 "METHOD", "URL", "FWDFOR"); 06 } 07 08 node*:::http-server-request 09 { 10 printf("+SERVER %2d %5d %20s (%5d) %8s %s (%s)n", 11 args[1]->fd, args[1]->remotePort, args[1]->remoteAddress, 12 args[1]->bufferSize, 13 args[0]->method, args[0]->url, args[0]->forwardedFor); 14 } 15 16 node*:::http-server-response 17 { 18 printf("-SERVER %2d %5d %20s (%5d)n", 19 args[0]->fd, args[0]->remotePort, args[0]->remoteAddress, 20 args[0]->bufferSize); 21 }
- 56. request-count.d 01 http-server-request 02 { 03 @[args[0]->url]=count() 04 }
- 57. loop.js 01 new Error().stack; 02 03function main() { func1(); } 04 function func1() { func2(); } 05 06 function func2() { 07 (function () { 08 for (;;); 09 })(); 10 } 11 main();
- 58. profile.d 01 profile-97 02 /execname == "node" && arg1/ 03 { 04 @[jstack(150, 8000)] = count(); 05 } 06 tick-10sec 07 { 08 exit(0); 09 }
- 59.
- 60.
- 61. node-stackvis $npm install -g stackvis
- 62. Make FrameGraph $ sudodtrace -s DSCRIPT > INPUT $ stackvis dtrace flamegraph-svg < INPUT > OUTPUT
- 63.
- 64. node-dtrace-provider https://github.com/chrisa/node-dtrace-provider $ npm install dtrace-provider
- 65. 01 var d = require('dtrace-provider'); 02 var dtp = d.createDTraceProvider('nodeapp'); 03 var p1 = dtp.addProbe('probe1', 'int', 'int'); 04 var p2 = dtp.addProbe('probe2', 'char *'); 05 dtp.enable();
- 66. 01 dtp.fire("probe1", function(p) { 02 return [1, 2]; 03 }); 04 dtp.fire("probe2", function(p) { 05 return ["hello, dtrace via provider", "foo"]; 06 });
- 67. Limitations data type :int, char maximum argument : 32
- 68. interval.js 01 function interval(msg) { 02 console.log(msg); 03 } 04 05 setInterval(function() { 06 interval('Hello Dtrace'); 07 }, 1000);
- 69. interval.js 01 var d= require('dtrace-provider'); interval.js 02 var dtp = 03 d.createDTraceProvider('nodeapp'); 04 var p2 = dtp.addProbe('echo', 'char *'); 05 06 function interval(msg) { 07 dtp.fire('echo', function () { 08 return [msg]; 09 }); 10 console.log(msg); 11 } 12 setInterval(function() { 13 interval('Hello Dtrace'); 14 }, 1000); 15 dtp.enable();
- 70. interval.d 01 nodeapp*:::echo 02 { 03 trace(copyinstr(arg0)); 04 }
- 71.