Build impossible programs

Transcript

1. build impossible programs JULIA EVANS bork
2. about a program I built that I wasn't sure would work rb spy
3. I 800 debugging profiling tools
4. ftp.sina.io yYIato OEht
5. GOAL 12016 Write a profiler that will work with and running Ruby program
6. Ei O myipn f
7. what I knew profilers like this existed for C Java 997 Your kite to perf as
8. why doesn t go.othaisreaefjs.fm ftp.iismptohsissible uT
9. myths about doing innovative work i i
10. myths you have to be an expert if it were possible worthwhile somebody would have done it you have to code on the weekend
11. MYTH ti
12. some minor problems understanding of Ruby internals none Ruby OSS contributions none profilers 1debuggers written O it trust 1C skills beginner
13. alternative to being an expert find a starting point spend time learning build a prototype
14. HE 2016 HE E Q
15. Bok 2016 Bok i O
16. HE 2016K Recurse center never graduate week f Iprwo pied
17. ruby current thread Rstring cfp l seq black panther body location label rb.threao.trb.co roi.frame.trb iseg.t a ct ise µµ µ
18. 1 week later 5Ucctssu extremely sketchy Rust demo
20. ET i 0 spoiler I didn't work on it for more than a year
21. my prototype had serious problems depended on highly unstable details about Ruby interpreter internals 2 3.2 2 3 3 required debugging symbols
22. MYTH E
23. 3 months later Rust conf ei
24. make that i o yehud Katz
25. REALITY not many people work on Ruby profilers same is true for MANY other I
26. MYTH OEI xaoi.neieo.fi praa time
27. where am I going to find 400 hours
28. where I found the time prototype kzo 6 L week of vacation the rest 2018 3 months paid or
29. cold
30. o Q
31. I have 3 months now what
32. TACTICS choose Rust survey the space amazing testing invest in usability document
33. on choosing Rust a even though I didn't know it well
34. Rost lets me to write fast programs to work with C data structures to write programs with no faults memory leaks
35. g for ambitious projects you might need new tools
36. TACTIC survey prior art
37. goal find out how every Ruby Python profiler works doing this took 1 day
38. 3 kinds of profilers to tracing profilers same process to sampling profilers same process to pyflame
39. how to find struct layouts pyflame compile time header files my demo runtime DWARF
40. how to find struct layouts pyflame compile time header files rbspy runtime compile time
41. TACTIC invest in testing
42. rb spy testing strategy collect core dumps memory snapshots for 5 6 different Ruby versions of test on those
43. result only 1 bug report about incompatibility with Ruby binary reported in 2 months
44. TACTIC invest in usability
45. features nobody can use might as well not exist
47. how flame graphs usually work to git clone github.com I add it to your PATH to cat data 1 flame graph.pl
48. how flame graphs work in rbspy run rbspy record rbspy automatically creates a flame graph
49. I qq.EU jcheerfulstoiccommented23daYJ I'm not sure if flame graphs are available in other tools but the ease and accessibility of them in rbspv brought them to me for the first time t
50. write documentation
51. rbspy.github.io
52. I spent 400 hours on this project
53. it mostly works I E.EE andrewhamptoncommented on Mar 30 I do a lot of work on a rails appthat's over 70yearsold I used rbspy record bundle exec rspec ftp aefeweeshagnniortoprmaesef.tv configuredthe script The CPUtime for the entire suitedroppedbynearlyan hour Thanks junsfor theamazingtool
54. give yourself the time to do something 0 ambitious as
55. qinermeonisso oasis toot 2017 2018 julia julia
56. provide sabbaticals thanks stripe Fund open source thanks
57. g yan bcrypt A lot of people ask why should I work in software development as opposed to math physicsHinanceletc One reason is that this field is surprisingly full of inadequate equilibria a steady state in which low hanging fruits are still available for non experts to solve 20 11428 07,487
58. go build something impossible