Back then: “ Java is too slow.”
Now: “Wait, #Java can do that?”
Ingo Düppe explains why #Performance is more than just speed.
Do you know what’s really under the hood of your #JVM today?
Read now: https://javapro.io/2025/04/07/hitchhikers-guide-to-java-performance/
#JVM, GC, Loom, #ZGC. Think Java is oldschool? Then you haven’t met Ingo Düppe.
How modern is your view of Java, really? Read " Hitchhiker’s Guide to #Java #Performance " You might be surprised: https://javapro.io/2025/04/07/hitchhikers-guide-to-java-performance/
Was haben HotSpot, Loom & Garbage gemeinsam? Mehr als du denkst! Ingo Düppe hat die Java-Galaxie kartiert – von 1995 bis morgen. Schon mal #JVM-Geschichte gelesen, die Spaß macht? Hier nachholen: https://javapro.io/de/hitchhikers-guide-to-java-performance/
The 2025 #Zhongguancun #Forum (#ZGC Forum) #Annual #Conference opened on Thursday, transforming #Beijing into a #global #epicenter of #innovation. With over 1,000 #participants from 100+ countries, the five-day #event #highlights #China’s drive to advance “New #Quality #Productive #Forces” through #international #science and #technology #cooperation. https://cnbusinessforum.com/zhongguancun-forum-2025-global-innovators-unite-to-shape-the-future-of-science-and-technology/
The 2025 #Zhongguancun #Forum (#ZGC Forum) #Annual #Conference opened on Thursday, transforming #Beijing into a #global #epicenter of #innovation. With over 1,000 #participants from 100+ countries, the five-day #event #highlights #China’s drive to advance “New #Quality #Productive #Forces” through #international #science and #technology #cooperation. https://cnbusinessforum.com/zhongguancun-forum-2025-global-innovators-unite-to-shape-the-future-of-science-and-technology/
Java 21 的 ZGC 在 Netflix 的效果
在 Hacker News 上看到連結「Bending pause times to your will with Generational ZGC (netflixtechblog.com)」，發現這篇還沒整理：「Bending pause times to your will with Generational ZGC」，裡面講的東西都有圖有數字 (i.e. Y 軸)，
"For a given CPU utilization target, ZGC improves both average and P99 latencies with equal or better CPU utilization when compared to G1."
Finally someone coming out with some number comparisons of using ZGC in their workload - still hoping for the big Java projects to follow, or at least have some benchmark/CI numbers public.
https://netflixtechblog.com/bending-pause-times-to-your-will-with-generational-zgc-256629c9386b #java #zgc
Boost Your Java Application Performance with Generational ZGC in JDK21
@violet Regarding low-collection overhead, there are also strategies like #Ada's storage pools and #Java's #ZGC's concurrent garbage collection (https://wiki.openjdk.org/display/zgc/Main), where the variance is very predictable (strict guarantee: won't be more than 1ms iirc; I think it qualifies as a firm real-time garbage collector) .
Storage pools have been implemented in #CommonLisp before, and there's no reason implementations cannot have realtime garbage collectors (iirc NASA has done it before).
It also sounds like they didn't even try #ZGC (https://wiki.openjdk.org/display/zgc/Main) since they're mentioning GC pauses as a problem and apparently their best answer to that was restarting nodes rather than configuring them to use a better GC.
Heap settings are really just tuning the same GC, not changing it.
