When you set up new web server instance you need to test its performance. Same thing when you need to change some option that can directly affect web server performance or you want to make it better. There are a lot of tools available for doing that, but my favorite is ApacheBench.
Basically it is simple tool that is available almost on all Linux distributions like basic package. Usage:
ab [options] [http[s]://]hostname[:port]/path
To perform web server performance test with ApacheBench execute this sample command that will send 1000 requests to the server:
ab -n 1000 http://HOSTNAME:80/
Most used options for ApacheBench are:
-n requests Number of requests to perform -c concurrency Number of multiple requests to make
Also there are useful options like:
-e filename Output CSV file with percentages served -X proxy:port Proxyserver and port number to use -k Use HTTP KeepAlive feature
For full list of options use help:
I hope it will be useful to know about this great tool.