Java Virtual Machine

“The JVM is amazing technology for what it is, but what it is still limits how fast it can go.”

“Garbage collection is also an option. Lots of backends on the JVM!”

“I don't necessarily like the JVM, it's just the most popular system-independent bytecode virtual machine”

“The productivity the JVM provides is second to none, including observability and state of the art GCs.”

“it's still so immensely wasteful compared to something well written running native”

“the performance, reliability & ecosystem of the JVM is unmatched”

“Where you can run JVM, there's a pretty good chance you can run your app.”

“Meanwhile when I run tests on my JVM projects it can take 30 seconds just to start”

“The JVM is arguably one of the most advanced and capable JITing runtimes.”

“Java compiles very fast because javac does little more than type checking”

“Where imho the JVM rocks, is that you can instrument it in production”

“why JVM sucks, and why GO's approach to minimize GC pause latency is far superior”

“Outside the browser there is hardly any value, just use JVM or CLR directly.”

“it provides absurdly good performance and more packages than pretty much all three of these languages combined”

“it's pretty easy to run a bunch of language on the JVM”

“Java's vm does not start in milliseconds nor has dozen independent implementations in every ecosystem”

“It's a proven mechanism to getting more performance and better optimizations.”

“It's one of the fastest VMs out there and is one of the most customizable ones as well.”

“unparalleled combination of performance, productivity, and observability”

“the claim that Erlang or Go are outright superior to the JVM doesn't really stand up”

“Not to compete but to beat, and not too much, but the right amount.”

“once it gets warmed up, the modern JVM has state of the art dynamic compilation and GC”

“The JVM can boot up in microseconds you just have to tune it a bit.”

“Whatever you produce that can run on the JVM will still be runnable in 30 years.”

“the platform itself is extremely backwards compatible”

“Minor version differences in the JVM result in unpredictable crashes.”

“Threads that really work and a good garbage collector for instance.”

“It loads slowly, takes a while to warm up, generally needs a lot of memory and the runtime is large and idiosyncratic.”

“the lack of value types is a big contributor to why Java uses so much memory”

“the JVM is a marvel of engineering with millions of hours that were poured in by smart people”

“It's used by lots all round the world, and solves real problems, just not the ones we were hoping it would solve.”

“I had to reserve 6gig of memory so that the jvm could actually start”

“JVM straight up crashed when Rosetta 2 was released and few years later it worked but with huge performance drop.”

“And it hogs all your RAM or runs out of heap space, and online help says to pass more -Xmxwhatever flags”

“The value, of course, comes from having a generic machine that you can then compile down into whatever machine code you want.”

“The JVM proved to the mainstream that a virtual machine good be as fast (sometimes even faster) than a compiled binary.”

“The only thing worse than launching the JVM from the command line, with it's looooooooooooong and inexplicable load time”

“the JVM can implement user-mode threads more efficiently than low-level languages can”

“The JVM in particular is a very robust host and there's a large ecosystem for it.”

“The JVM is an amazing mature runtime with a boatload of tooling.”