3 ms·

Hmm. what is a flat array? By value type, you mean assignment causes deep copy instead of reference copy? What is the advantage of a static binary over just

by x0x0 12y ago

Hmm. what is a flat array? By value type, you mean assignment causes deep copy instead of reference copy? What is the advantage of a static binary over just shipping the jvm (which you are certainly allowed to do)? I guess I could see it if you are writing end-user software, but the jvm is pretty much server-software and devtools at this point. What do you mean it always jits? So does the jvm unless I misunderstand what you mean by jit. simd is beginning to make its way into java, but numerics are not the jvm's strong spot. I didn't think they where for c# either. Is this incorrect? And yeah, jni is fucking awful. Real generics would be nice. Thanks for your answer.

pjmlp 12y ago
> what is a flat array? In multidimensional arrays you do one single allocation instead of n times m time k times ... allocations. You can fake this in Java by allocating one major block and doing the math for the respective cell yourself but it is cumbersome. > What is the advantage of a static binary over just shipping the jvm The same as doing coding in C and similar languages. Guess one of the reasons why Java lost the desktop. > What do you mean it always jits? There isn't any interpretation going on. On most JVMs you need to set execution threshold to zero to achieve similar behavior. On most JVMs, it is a two step process as they start interpreting and only hot methods (this is customizable on most) get JITted. > simd is beginning to make its way into java It is still not clear if it will make it into Java 9 timeframe. > Is this incorrect? Yes, as C# as managed to place itself as "good enough C++" on the Windows world, for many use cases.
- x0x0 12y ago
  Thank you. I've shipped single jar programs -- it's pretty simple to repack everything -- and I believe (but am not 100%) that we included the jvm in there, so it can be done. At the expense of a 100+m download, but for our use case, that was not an issue. Have you seen performance improvements from forcing always jit? I've played with similar settings and only really found them useful for benchmarking. I'm surprised you're seeing c# for numerics on windows; I thought there wasn't much besides games that needs to be local and isn't written in c++ these days, either for performance or because the codebase is old. I work on ml programs, mostly c++ and java.
  - pjmlp 12y ago
    > I'm surprised you're seeing c# for numerics on windows; Bioinformatics

by x0x0 12y ago

pjmlp 12y ago

> what is a flat array? In multidimensional arrays you do one single allocation instead of n times m time k times ... allocations. You can fake this in Java by allocating one major block and doing the math for the respective cell yourself but it is cumbersome. > What is the advantage of a static binary over just shipping the jvm The same as doing coding in C and similar languages. Guess one of the reasons why Java lost the desktop. > What do you mean it always jits? There isn't any interpretation going on. On most JVMs you need to set execution threshold to zero to achieve similar behavior. On most JVMs, it is a two step process as they start interpreting and only hot methods (this is customizable on most) get JITted. > simd is beginning to make its way into java It is still not clear if it will make it into Java 9 timeframe. > Is this incorrect? Yes, as C# as managed to place itself as "good enough C++" on the Windows world, for many use cases.

x0x0 12y ago
Thank you. I've shipped single jar programs -- it's pretty simple to repack everything -- and I believe (but am not 100%) that we included the jvm in there, so it can be done. At the expense of a 100+m download, but for our use case, that was not an issue. Have you seen performance improvements from forcing always jit? I've played with similar settings and only really found them useful for benchmarking. I'm surprised you're seeing c# for numerics on windows; I thought there wasn't much besides games that needs to be local and isn't written in c++ these days, either for performance or because the codebase is old. I work on ml programs, mostly c++ and java.
- pjmlp 12y ago
  > I'm surprised you're seeing c# for numerics on windows; Bioinformatics