Its been a while since I tried, but if I remember correctly I had to delete the code that tested the compiler name / version in one of the sh files. I set the compiler to icc via the environment variables.
The build ran for a while but then stopped with an error message. I remember it not being very helpful. I would think you'll have better luck on Linux + gcc than me on Mac, although icc claims compatible with llvm too. Let me know if you succeed! On Thu, Jan 30, 2020, 9:37 AM Magnus Ihse Bursie < magnus.ihse.bur...@oracle.com> wrote: > > > On 2019-12-18 00:05, August Nagro wrote: > > I published some benchmarks of OpenJDK on Mac with Ofast and O3 [1]. Some > microbenchmarks like Netty’s HttpObjectEncoder experienced >100% speedup with > O3, and the more real-world Dacapo suite was ~15% improvement over O2 (which > is exactly the same as Os). I did include a few other flags, however the > speedup was primarily due to optimization level. > > Building with Os is the old wisdom. It used to be the case that many programs > would be faster with the smaller binary size, but this is almost never the > case nowadays. > > - August > > [1]: http://august.nagro.us/optimized-openjdk.html > > Nice. :) > > I noticed this on your blog post: > > I also tried building with Intel’s Compiler > <https://software.intel.com/en-us/c-compilers>, and patched the configure > scripts to allow it. However, the build failed cryptically. I’d also be > interested to see Linux results. > > > How did you patch configure, and what errors did you run into? In general, > it's not a small task to get OpenJDK to compile with a new compiler, but > Intel claims a high level of compatibility with gcc [1] and that increases > chances that it should be possible to achieve with not too much effort. I'm > slightly tempted to looking into it. :) > > /Magnus > > [1] > https://software.intel.com/en-us/cpp-compiler-developer-guide-and-reference-gcc-compatibility-and-interoperability > > > >
