Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.maint.java > #12498

Re: OpenJDK Zero interpreter: fast bytecodes

Show all headers | View raw

Hi Aleksey,

Le 05/01/2023 à 10:16, Aleksey Shipilev a écrit :

> Last year, I implemented the fast bytecodes feature in OpenJDK Zero 
> interpreter [1]. It shipped with JDK 18, and I have recently backported 
> it to 17u. This should land in 17.0.7 in April 2023.
> 
> I believe Debian runs with Zero on some architectures that do not have 
> "server" ports. From the look at openjdk-17-jdk [2], I assume at least 
> alpha, mips64el, mipsel, riscv64, sparc64, m68k, sh4 are running with Zero.
> 
> This feature should make the builds that involve OpenJDK -- for example, 
> building Java packages -- considerably faster. On my RISC-V board, the 
> 17u tests are routinely >10% faster, some tests are 50% faster.

This looks promising, thank you!

Is it enabled in all JDKs after JDK 18 too?


> But there might be new bugs, so I wanted to give you a heads-up about 
> this. -XX:-RewriteBytecodes restores the original behavior, if needed. 
> If there are even more serious problems, we can revert the backport 
> completely. It would be nice to know about this before the 17.0.7 
> release crunch in late March, though.
> 
> Is there an easy way to check if e.g. bookworm can be fully re-built 
> with latest and greatest 17.0.7 EA?

Its tricky, the arch all packages are usually built and tested on amd64 
only (reproducible-builds.org also rebuilds on i386, arm64 and armhf). 
Rebuilding the 1500+ Java packages takes at least two days on a 4c/8t 
4GHz Xeon, but on m68k it's going to take ages and that would abuse a 
bit the shared porter boxes.

Technically, this implies:
- logging into a porter box (https://db.debian.org/machines.cgi)
- cloning the java-common and openjdk-17 packages (using debcheckout)
- rebuilding these two packages
- running ratt (https://tracker.debian.org/pkg/ratt) with the .changes 
files of java-common and openjdk-17
- relax and grab some popcorn
- cry because you forgot to use 'screen'
- analyze the build logs, looking for unexpected failures compared to 
amd64 (reproducible-builds.org [1] has a good summary of the know build 
issues)

Emmanuel Bourg

[1] 
https://tests.reproducible-builds.org/debian/unstable/amd64/pkg_set_maint_pkg-java-maintainers.html

Back to linux.debian.maint.java | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

OpenJDK Zero interpreter: fast bytecodes Aleksey Shipilev <shade@redhat.com> - 2023-01-05 10:50 +0100
  Re: OpenJDK Zero interpreter: fast bytecodes Emmanuel Bourg <ebourg@apache.org> - 2023-01-05 23:30 +0100
    Re: OpenJDK Zero interpreter: fast bytecodes Aleksey Shipilev <shade@redhat.com> - 2023-01-06 12:50 +0100

csiph-web