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Claes Redestad
Personal blog · cl4es.github.ioprogrammingsystems
Claes Redestad's personal blog at cl4es.github.io covers programming and systems. Since 2019, 11 different Hacker News readers have linked it 16 times, most often “OpenJDK Startup – Late 2019 Edition”. The last post was in 2021, but the archive is still widely read.
A blog about Java, OpenJDK and various performance related adventures thereabout.
Most-linked posts?
- OpenJDK Startup – Late 2019 Edition8 people · 11 mentions · first linked 2019-11-20
What Hacker News says?
> important the point still is that Android should totally switch to openjdk, end of story Not "end of story" at all - why should Android switch? You mentioned ZGC & Shenandoah, but why do you think that would be a benefit? Have you actually tried benchmarking your app in ART vs. OpenJDK? Do you have any clue at all if ZGC would even be an improvement in your workloads, or the workloads of a typical Android app for…
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Flutter for Linux”Submitted Zip Lookups – A Word from the Sponsor as a story · 2 points
HN discussionThey've been working on it for quite a while, yeah :) I appreciate it and they've made quite a lot of progress... but it's still nowhere near Go, and I mostly doubt it ever will be. # time ./hellogo hello world real 0m0.005s user 0m0.001s sys 0m0.005s It's probably "good enough" for many cases nowadays tho, yes, e.g.: https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht...
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Diving into Go by building a CLI application”Submitted OpenJDK Startup – Late 2019 Edition as a story · 2 points
HN discussionNo, just lots of different things. G1 has had ~700 improvements since JDK 8 and is now very different: https://archive.fosdem.org/2020/schedule/event/g1/ ZGC, the low-latency collector (which gives a ~1-2ms max pause times on heaps of up to 16TB in JDK 16) was introduced in 11 and made production-ready in 15. In general, the way the GCs work is just very different from 8. Plus, there have been lots of improvements t…
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Apache Helix – Near-Realtime Rsync Replicated File System”Submitted Reducing MD5 (and SHA) Overheads as a story · 1 points
HN discussion> HotSpot, under a typical configuration, eats up about 250MB just sitting there doing nothing. This is much lower in newer jdk's [0]. > For a slightly more apples-to-apples comparison that's also quite a bit more apples-to-jicama, if I open vscode and IDEA on the same project (a small one I'm just getting started on), vscode and all its helpers are using 316MB, and IDEA is using 1.08GB I believe this to just be int…
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “A Picture of Java in 2020”Submitted Investigating MD5 Overheads as a story · 1 points
HN discussionThe funny thing is HotSpots startup time and memory usage are drastically lower on jdk 14 vs 8 [0]. I think the next step for Java will be more people shifting to using ZGC which automatically releases unused heap back to the OS where the current default (G1) doesn't. [0] https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht...
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “RedHat Mandrel Makes Java Native”Submitted String Concatenation, Redux as a story · 1 points
HN discussionhttps://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht...
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Java JIT vs. Java AOT vs. Go for Small, Short-Lived Processes”The article wasn't using a current Java, either. Current numbers are under 40ms for Hello, World: https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht...
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Java JIT vs. Java AOT vs. Go for Small, Short-Lived Processes”Modern JVMs don't take that long to start. While not at raw binary levels they shouldn't be killing your focus as theyre on par with scripting languages. https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht... .
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Pulsar – an open-source distributed pub-sub messaging platform”I think the overhead of GC is negligible for many small programs. Claes Redestad @ Oracle gives a good overview here. https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht... I would look into GraalVM native images if you want fast startup.
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Epsilon: The JDK’s Do-Nothing Garbage Collector”The main differences are probably the compilers involved, which tend to be layered based on how often a routine gets called (starting interpreted, then using a fast-but-dumb JIT compiler, then a slow-but-smart JIT compiler). There are many JVMs, each operating slightly differently, but the HotSpot JIT seems to be the most widely used (e.g. https://cl4es.github.io/2019/11/20/OpenJDK-Startup-Update.ht... ) Node runs o…
Comment linking /2019/11/20/OpenJDK-Startup-Update.html
on “Anti-Patterns to Avoid in Lambda Based Apps”> I had really high hopes for the Java AOT stuff but it seemed to stall (maybe I missed something). Project Leyden [1] aims to standardise AOT for the Java Platform. It is planned to start sometime in the new year. We will most likely end up with two implementations of it. One is GraalVM's native image which will most likely need to make some changes in order to follow the specification. And another implementation w…
Comment linking /2020/12/06/Towards-OpenJDK-17.html
on “Why Java Is Dying”
