Benchmarks

This is the website of the JavaFX FramebufferY8 Benchmarks repository. This site documents the results of the benchmark tests comparing the new FramebufferY8 class with the old Framebuffer class. These classes are part of the Monocle implementation of the Glass windowing component in the JavaFX Graphics module.

The purpose of the benchmarks is to show that we can replace the methods in the Framebuffer superclass with those of its FramebufferY8 subclass and eliminate the subclass entirely. The results of the benchmarks also show a performance problem in JDK 13 on ARM processors, which is described below.

I have done three rounds of tests, denoted by the month they were started: 2020-05, 2020-04, and 2019-12.

2020-05

The results of my third round of tests in May 2020 are published on the 2020-05 page.

This round of tests confirmed what I saw in April: JDK 13 on ARM processors had a remarkable drop in performance that has mostly returned in the latest release of JDK 14.

For comparison, the chart below shows the performance of the same method on an Intel Xeon processor.

The flame graph below helped me figure out the cause of the performance drop on ARM.

2020-04

The results of my second round of tests in April 2020 are published on the 2020-04 page.

The most interesting result was the apparent fix in JDK 14.0.1 for the performance problem I saw in December, shown by the following graph of Ubuntu 20.04 on a 32-bit QEMU ARM virtual machine.

For comparison, the chart below shows the performance of the same method on an Intel Xeon processor.

2019-12

The results of my first round of tests in December 2019 are published on the 2019-12 page.

The most interesting result was the drop in performance on ARM processors starting in JDK 13, shown by the following graph of Ubuntu 20.04 on a 32-bit ARM Cortex-A9 processor.