Java Turns 25 – Whats Next? [pdf]

Post by sideeffffect » Wed, Sep 23, 2020, 7:43 PM UTC

hilbertseries wrote: post #209

throwaway189262 wrote: post #131

Earlier quoted context omitted.

> How do you find a reasonably small Xmx that doesn't lead to OutOfMemoryError exceptions? That's tough to figure out. In new versions of Java, I think 14+, if you use ZGC collector it will return unused memory to the OS. Memory options vary depending on collector, but new versions of ZGC support "soft max" heap size and uncommit. Together it might be close to what you're looking for https://malloc.se/blog/zgc-softma…

> I should mention the GC situation was worse until the last few years. Until ZGC and Shenandoah came around, Java still didn't collect frequently but when it did there were long pauses. This feels like G1GC erasure. I'll also say we've tried out ZGC and while pause times were low, it had a huge CPU overhead and the performance of our application was notably worse and we went back to G1GC. We're still on Java 11, so…

Post by sideeffffect » Thu, Sep 24, 2020, 12:28 PM UTC

deepakarora3 wrote: post #148

throwaway189262 wrote: post #114

Earlier quoted context omitted.

That's not always true. Most of the time when Java uses a ton of memory it's because people use the default memory settings. If you tell Java to use up to 90% of system RAM, it will. Garbage collection is expensive so it will delay until memory is depleted. This is a different GC design than V8 and Go, which use older collector designs with high overhead. They need to collect very frequently because their stop the wo…

All OK except when you need the same level of performance for those 0.001% of requests when the GC kicks in and takes the response time outside acceptable limits. Due to this reason alone, my company is planning to move off a popular Java based API gateway and to a C++ envoy side car implemented service mesh. And I am wondering if this is really worth it.

Post by jjav » Sat, Sep 26, 2020, 1:42 AM UTC

mrjoelkemp wrote: post #32

yagodragon wrote: post #12

Java might be the most successful programming language. It is a solid choice among many different fields. It is used on huge infrastructure projects (Apache Foundation), governments, big tech companies such as amazon, ibm, google, apple for many large scale services. It can do web, ml, GUIs, it's still strong among academics. On top of that it offers a great programming experience with excellent IDE support and it's…

In my opinion, Java as a web language is good when you don't need to really understand what's happening (like in low-traffic situations). If concurrency isn't an issue, then the massive amount of libraries can help you a lot. In high-traffic environments, that ignorance punishes you. I've always felt Java and the JVM are of the mindset that you need a Ph.D. to even understand how it works or how to configure it, and…