I've been trying to figure out what the more generally accepted services for load testing are. I am trying to test functionality across a couple sites. I'd like to find out how many concurrent requests I can support, how many concurrent submissions I can support, etc. What are some commonly encountered tools/methodologies in Industry?
JMeter, or write your own load generation framework.<p>Mind the Network links, don't forget doing it within a Cloud provider's network boundary is not giving you the whole picture of how network traffic'll look like coming from the 'Net at large.
Time spent learning JMeter is not time wasted. Figure out the parts that let you reuse scripts from code fragments - this is very valuable. It's also worthwhile to build complex scripts "by hand" a few times by clicking around - you will quickly learn where all the buttons are in the UI and how to translate back and forth between the UI controls and the XML fragments.
Check out k6s: <a href="https://k6.io/" rel="nofollow">https://k6.io/</a>
They were great before the Grafana Labs acquisition, and they still are.
JMeter is great, as others have mentioned. If your task is simple enough and doesn’t require that request origins be distributed, you might be able to get away with (much less complex) Apache Bench.