* Claes Redestad: > On 2019-11-25 18:30, Florian Weimer wrote: >> That being said, relocation processing for libjvm.so adds a couple of >> milliseconds to startup, and it looks like their number is growing with >> each release. > > This piqued my interest, so I took a quick look: > > readelf --relocs libjvm.so | wc -l > > 8: 85635 > 9: 112645 > 11: 105607 > 13: 107912 > jdk/jdk: 106175 > > 9 saw a big jump, yes, but things look pretty stable since, even > improving a bit (various cleanups and feature removals..?).
I see slightly higher numbers with the default build flags. The recent drop by ~1000 relocations is due to the CMS removal. > Of course improvements in this area would be most welcome (not an area > I've been paying attention to - maybe I should?) Unfortunately, I'm not aware of a good tool to gather relocation statistics with a goal towards avoiding them. Some cases may be easy changes (e.g., rewriting arrays of character strings). I suspect that quite a bit is related to C++ vtables. Thanks, Florian
