On 2020-01-30 21:38, August Nagro wrote:
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!
I stopped before I even started. I'd just assumed the icc had a free
download, but this was not the case. Possibly I could use the open
source contributor version, but that required downloading a whole suit,
not just the compiler. Oh well.
/Magnus
On Thu, Jan 30, 2020, 9:37 AM Magnus Ihse Bursie
<magnus.ihse.bur...@oracle.com <mailto: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 withIntel’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
