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We are testing extensive high loads on our Web Sites and Web Services. We use JMeter and other tools for this purpose.
Say for example: We have 5000 users/ second scenario.
These scenarios our local machines or any other Virtual machines fail to test due to heavy memory consumption.
Can people suggest their valuable inputs on what configuration of server should I buy for my testing purpose.
Currently we are planning a 16GB Ram Xeon Server.
But I need inputs from experts.
It is impossible to say something like "this hardware will able to simulate that much virtual users" as the maximum load you can produce from hardware strongly depends on the nature of your test.
For instance, if your test is simple hammering one or several pages with GET requests - you'll be able to simulate X users.
If your test assumes massive pre/post processing, uses parametrisation and assertions, - it will be less, i.e. X / 2.
So I would go for the following:
This will give you an idea what will be hardware requirements for 5000 concurrent users for that particular load test.
Also be aware that 5000 concurrent users doesn't necessarily mean 5000 requests per second as users need some time to "think" between requests, they don't hammer application non-stop, so think time + page load time needs also be considered.
For instance, if user thinks for 10 seconds between requests and page load time is 2 seconds, it means that each user can do 5 requests per minute.
5000 users will do 25000 requests per minute which is ~415 requests per second and this load can be produced by single modern mid-end hardware. If you decide to go that way - simulate throughput instead of concurrency - take a look at Constant Throughput Timer
