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

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. github.com/openjdk/jdk/pu…

🎉 #jdk22 will have a `jcmd {pid} System.map` to show the annotated memory mapping on linux. Thanks Thomas Stuefe 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.

Noice, proposition by Thomas Stuefe 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. mail.openjdk.org/pipermail/jdk-…

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: fosdem.org/2024/schedule/…

New JEP proposal "Security Providers Filters" by our Martin Balao Alonso and Francisco Ferrari Bihurriet. openjdk.org/jeps/8325511

Doing this talk with Roman Kennke 🗽 together had been a ton of fun, as had been the whole FOSDEM this year (kudos to the FOSDEM @[email protected] organizers).

github.com/openjdk/jdk/pu… by Red Hat 's Andrew Haley is aph13 in the blue place 💙 🏳️‍🌈 Bye bye type pollution issue, you won't be missed!

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

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.

Thanks, and good job Roman Kennke 🗽! Pleasure working with you :)

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 Aleksey Shipilëv Francesco Nigro Trustin Lee Thomas Stuefe, and Volker Simonis ...

A few years ago we all met in Waldorf with Thomas Stuefe , 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 Roman Kennke 🗽 and all the others!

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

This was a good day.