Catchpoint systems Web Performance Monitoring WPO Overview Monitoring Overview When things go wrong on the internet

1. 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED Web Performance Monitoring Tales The Internet, A Series of Tubes… Mehdi Daoudi – CEO Catchpoint Systems – mehdi@catchpoint.com

2. We all want to make web sites load faster! Performance is the 5th P of the Marketing Mix, Performance is a Business Differentiator! Bad performance: Not good for business Not good for brands Not good for end users Not good for IT 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 2 Welcome and Thank you!

4. Use a CDN (Edgecast, Cotendo, Akamai, Cdnetworks, NetDNA)

5. Domain Sharding

6. HTTP 1.1 Keep Alives (and make sure it is working!)

7. Gzip CSS and JS

8. Audit your CDN, make sure the right headers are in place at your origin server!

9. Audit your Web front end servers to ensure Gziping, Keep Alives

10. Caching : Expire Headers / Public for CDN to ensure Cache-ability

11. Remove ETAGS

13. JS at the bottom

14. Minify JS and CSS

15. Optimize images

17. WPO Applied – It works!!! 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 5

18. Using a CDN improves East Coast Times 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 6 Introduction of CDN

19. 80 / 20 Rule 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 7 Steve Souders: “80% of the end-user response time is spent on the front-end. Start there.” Well when things go wrong it’s more like 20 / 80!

20. Monitoring 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 8 DB monitoring RUM External Monitoring Internal Monitoring Network

21. Monitoring 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 9

22. Collection of Plumbing Tales 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 10

23. My site is down … HELP!!!! 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 11 100 % Downtime

24. My site is down … HELP!!!! 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 12 Varnish issuing 302 to cyber-drain 100 % Downtime

25. Clogged Internet Tube? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 13

26. Clogged Internet Tube? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 14 Latency increase

27. Clogged Internet Tube? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 15 Latency Increase by 100 ms

28. What !@&(&@# is happening? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 16 20 % Packet loss

29. DNS huh? What is DNS? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 17 Adserving company has performance & discrepancies issues… DNS Provider Change

30. DNS huh? What is DNS? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 18 Adserving company has performance & discrepancies issues… Moved to another DNS provider! DNS Provider Change

31. Midnight call with Customer…Houston we have a problem! 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 19 New Load Balancer Config – Loss of Stickiness

32. Impossible… I can not have downtime 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 20 CDN handing over Dead NS server

33. Web Site Performance X2. Why? 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 21

34. Oops … bad httpd.conf file 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 22 Apache configuration! No More Keep Alives

35. Why am I seeing spikes…?let’s see under the hood… 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 23

36. Why am I seeing spikes…?let’s see under the hood… 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 24 Database Slowness impacts user experience

37. External Monitoring 5/18/11 CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 25 Simulates End User activity Measures the end to end transaction Continuous, 24x7 Detect anomalies Track performance degradations / improvements over time Measures every Component

40. DNS

41. Origin servers

42. if Multiple datacenters, monitor them individuallyBaseline very often, track improvement or degradation Keep an eye on performance during critical business hours (Volume) Review Daily / Weekly Alerts on % Delta

43. CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 27 Toolbox

45. IE 9 – Developer tool

46. Fiddler

47. HTTPWatch

48. Yslow

49. Dynatrace

50. Wireshark

51. Firebug

52. Dig for DNS

54. Google Page speed (http://pagespeed.googlelabs.com/)

55. Closing the Loop CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 29 Rule #1: You can't improve what you can't measure. Monitor Action Plan  Optimize Monitor… do it again Rule #2: It isn’t over till it’s over. And it’s never over.

56. CATCHPOINT SYSTEMS . CONFIDENTIAL . © 2011 . ALL RIGHTS RESERVED 30 THANK YOU. http://blog.catchpoint.com @catchpoint