Removing the warning about that ParallelGC is better than G1C for SQX, it´s not true anymore

as we all know, SQX "warns" us if we use the default G1C garbage collector of Java, recommending to use ParallelGC (and offering an automatic fix to do so) as ParallelGC would be much faster. This can´t be more wrong as of "late" (actually even since the latest versions of Java 8 already). G1C is *much* faster than ParallelGC in Java 9, 10 and 11. It has been tuned to be the current best all-around garbage collector for most Java applications and that includes SQX (just do a performance test and also note how much better G1C uses the available RAM if you assign especially large heaps with 15GB+). With ParallelGC I get about 211000 systems / hour, while G1C gives me 234000 systems / hour. And especially if you are working with large backtesting data (32 years in my case) and RAM usage increases, G1C is having a huge performance boost over the ParallelGC.

I am wondering why the ParallelGC is still being recommended over G1C nowadays, given that G1C did already catch up with the late Java 8 updates and started to outperform ParallelGC. G1C was slow and ugly when it was first introduced, but that was many years ago and it has been improved heavily. See this article and remember that it talks about Java 8 and 9, we are at 11 now and G1C has been tuned further already and is even faster now :


http://blog.mgm-tp.com/2018/01/g1-mature-in-java9/



So to make it short: I would recommend to remove that warning and use G1C as the default garbage collector for SQX.