Java EE 8 High Performance

Benchmark, benchmark, benchmark

Working on performance is not uniform work. We saw that in the previous section; there are lots of tools doing that and each of them gives more or less information, but also has more or less impact on the actual performance. For instance, instrumenting all the code of the application to get metrics on all layers will make the application very slow, but the report very rich. On the contrary, instrumenting only some parts—such as the outbounds—will not impact the application that much, yet the report will give you only a very small set of data. This means that depending on the layer you work on, you will not use the same tools to ensure you have the right level of information.

Thus, we can distinguish multiple ...