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> The JVM is a VM in that sense. It isn't a physical computer, but presents itself as one. No, it isn't and doesn't. What in the world does it have that makes
by dataflow 2y ago
> The JVM is a VM in that sense. It isn't a physical computer, but presents itself as one.
No, it isn't and doesn't. What in the world does it have that makes you think it pretends to be a computer? A bunch of pretend registers and a memory limit?
- kragen 2y agoIt doesn't have registers, pretend or otherwise, or a memory limit. It sounds like you aren't very familiar with the JVM or computers in general. On the JVM in particular, I suggest reading https://docs.oracle.com/javase/specs/jvms/se23/html/index.html https://docs.oracle.com/javase/specs/jvms/se23/html/index.ht....
- dataflow 2y agoWhat are you talking about? It literally has a program counter register, it's right there in you own link? https://docs.oracle.com/javase/specs/jvms/se23/html/jvms-2.html#jvms-2.5.1 https://docs.oracle.com/javase/specs/jvms/se23/html/jvms-2.h... I just mixed it up with Dalvik having multiple registers, but that makes it even worse. At least normal machines have more registers. And literally here: The following section provides general guidelines for tuning VM heap sizes: The heap sizes should be set to values such that the maximum amount of memory used by the VM does not exceed the amount of available physical RAM. https://docs.oracle.com/cd/E21764_01/web.1111/e13814/jvm_tuning.htm#PERFM150 https://docs.oracle.com/cd/E21764_01/web.1111/e13814/jvm_tun... Maybe instead of telling me I'm clueless, tell me how you're right? What do you see in it that is actually virtializing a computer in your mind? Because I'm pretty sure that if someone sold you a VM service and it turned out to be just them running your programs under the JVM, you'd be kind of mad.