Impressions from FOSDEM 25 4/4 Martin Doerr, PPC port lead, gave an interesting deep dive into the PowerPC implementation of the Foreign Function Interface, earmarked to replace JNI

Impressions from FOSDEM 25 3/4 Kelvin Nilsen talking about Generational Shenandoah ( https://t.co/0dv94eJv5c). Shipped as an experimental feature with the upcoming JDK 24, it shows impressive gains for most workloads.

Impressions from FOSDEM 25 2/4 Me talking about the future of class space. This by-product of our work on Lilliput will see us revamp class space, possibly completely removing it. That would prepare Lilliput 2 and significantly reduce maintenance costs.

Impressions from FOSDEM 25 1/4 @rkennke talking about Project Lilliput ( https://t.co/GEHb6nhfuI) and its possible future with Lilliput 2. I am proud to have been a part of that. We can boast significant improvements on both footprint memory bandwidth.

Thomas Stüfe (@tstuefe) is talking about Class-Space at FOSDEM.

This was a good day.

A few years ago we all met in Waldorf with @tstuefe , @volker_simonis , and Kelvin to learn about Lilliput and Shenandoah. Now both are either in or going in. Congrats! (and I need to find that picture)

We did it :-) Huge thanks to @rkennke and all the others!

The work on the JVM ecosystem always amazes me, especially how much someone has solved the problems you may be facing. In this case, I tip my hat to @shipilev @forked_franz @trustin @tstuefe, and @volker_simonis ...

Using project Lilliput not only saves the heap memory but also reduces CPU usage and latency, as more objects fit into CPU cache. @rkennke on #JVMLS.

Thanks, and good job @rkennke! Pleasure working with you :)

Small trick to demonstrate the tighter packing of objects with a Lilliput-enabled JVM with a simple Java program: Call JVM with -XX:hashCode=4, then create a bunch of Object() and print out their ihashes. If no GCs intervene, addresses should be 8- instead of 16-byte-aligned.

https://t.co/XWx71E15c1 by @RedHat 's @AndrewHaley13 Bye bye type pollution issue, you won't be missed!

Trying to open a bug report with @jetbrains is an exercise in frustration.

Doing this talk with @rkennke together had been a ton of fun, as had been the whole FOSDEM this year (kudos to the @fosdem organizers).

New JEP proposal "Security Providers Filters" by our Martin Balao Alonso and Francisco Ferrari Bihurriet. https://t.co/2N7lhSLtja

Video of my #FOSDEM 2024 talk, “Ruby on the Modern JVM: Fibers, FFI, and More” is now available on the FOSDEM site below! I’ve also uploaded PDF slides which should be visible soon: https://t.co/xsBEvRcKFC

Noice, proposition by @tstuefe to have library to intercept memory allocation via the infamous LD_PRELOAD and report them in NMT. It would be useful for FFM too With the NMT JFR event that could be really nice, however those don't have stacks. https://t.co/PjGbyWwnPE

🎉 #jdk22 will have a `jcmd {pid} https://t.co/yAcc3ELx5B` to show the annotated memory mapping on linux. Thanks @tstuefe for this ! Would be useful on other platforms, but that requires some work ! E.g. Is this really necessary to call another process like `vmmap` on macOS.

We can now limit the memory used by the JIT (C1, C2). That allows us to cut off those rare spikes that can cause lasting OS-side memory retention. https://t.co/ouenDU3cCh