Scaling WordPress With Load Testing https://boogah.org/wcsac16

Let's talk about performance testing

Why load test?

Common styles of performance testing

Stress testing

Spike testing

Endurance testing

Configuration testing

YMMV

Tools

ApacheBench

ApacheBench Gotchas » Single threaded. » Not good for benchmarking high capacity servers. » Works best when run from the same server as your site. » Can only hit one URL at a time. » Not much actionable data. » Not a real browser test. » No HTTP/2 support.

Using ApacheBench ab -n 100 -c 10 https://jasoncosper.com/ Translation: Have ApacheBench send 100 requests to my site. There should be no more than 10 requests running concurrently.

ApacheBench Output Server Software: nginx Server Hostname: jasoncosper.com Server Port: 443 SSL/TLS Protocol: TLSv1.2,ECDHE-RSA-AES256-GCM-SHA384,4096,256 Document Path: / Document Length: 31927 bytes Concurrency Level: 10 Time taken for tests: 34.163 seconds Complete requests: 100 Failed requests: 0 Total transferred: 3253000 bytes HTML transferred: 3192700 bytes Requests per second: 2.93 [#/sec] (mean) Time per request: 3416.350 [ms] (mean) Time per request: 341.635 [ms] (mean, across all concurrent requests) Transfer rate: 92.99 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 244 259 18.5 253 343 Processing: 483 3015 2104.7 2566 11495 Waiting: 479 3011 2104.9 2564 11491 Total: 754 3274 2105.9 2813 11766 Percentage of the requests served within a certain time (ms) 50% 2813 66% 3673 75% 4369 80% 4677 90% 6319 95% 7818 98% 9886 99% 11766 100% 11766 (longest request)

If you have macOS you have ApacheBench

Installing ApacheBench If you're using Ubuntu to do your development work: apt install apache2-utils

h2load

h2load > ApacheBench » HTTP/2 and HTTP/1.1 support out-of-the-box! » It's multithreaded! » Support for more than one URL!

h2load Gotchas » Limited actionable data. » Not a real browser test. » Best run from the same server as your site.

Using h2load h2load -n1000 -c100 -m10 https://jasoncosper.com/ https://jasoncosper.com/podcasts/ Translation: Have h2load send 500 requests to two URLs with 100 concurrent clients. And please don't go over 10 concurrent streams.

h2load Output starting benchmark... spawning thread #0: 100 total client(s). 500 total requests TLS Protocol: TLSv1.2 Cipher: ECDHE-RSA-AES256-GCM-SHA384 Server Temp Key: ECDH P-256 256 bits Application protocol: h2 finished in 100.52s, 4.97 req/s, 143.56KB/s requests: 500 total, 500 started, 500 done, 500 succeeded, 0 failed, 0 errored, 0 timeout status codes: 500 2xx, 0 3xx, 0 4xx, 0 5xx traffic: 14.09MB (14776906) total, 208.11KB (213106) headers (space savings 21.04%), 13.86MB (14531900) data min max mean sd +/- sd time for request: 442.43ms 100.21s 42.23s 26.80s 61.80% time for connect: 236.00ms 301.97ms 268.62ms 19.25ms 63.00% time to 1st byte: 678.74ms 46.08s 13.66s 9.60s 69.00% req/s : 0.05 0.12 0.07 0.02 74.00%

Installing h2load https://boogah.org/inst-h2load

JMeter

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Apache JMeter » Created to test production web apps. » Ridiculously configurable and extendable. » Cross-platform (Mac, Windows, Linux) » Fully multithreaded. » GUI and CLI. » Distributed remote testing support.

Installing JMeter https://boogah.org/inst-jmeter

Creating test plans is easyish

Don't test production environments from your laptop

Flood IO https://flood.io/

BlazeMeter https://www.blazemeter.com/

Real world scenarios

Google Analytics is your friend

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Useful Filters » ?s » product » category » tag

Bringing it all together

WooCommerce Test Plans » Browse site. » Browse site, perform multiple searches. » Add products to cart, check out. » Log in, browse site. » Log in, visit "My Account" page. » Log in, add products to cart, check out.

YMMV

Okay, but how many users?

Push it to the limit

My limit seems kinda low

Questions?

@boogah https://jasoncosper.com/ https://hipsum.co/