我是 Java 的新手（之前在嵌入式平台上使用过 C），所以如果这个问题非常微不足道，请原谅我。
我需要用Java实现一些信号处理算法。我知道 Java 可能不是执行此操作的最佳语言 [1]，但提出 Java 要求主要是因为我团队的其他成员根本不熟悉 C。
我们需要做的就是读取一些包含视频帧的文件，处理它们（收集有关它们的一些统计数据），然后将它们写回磁盘。处理过程将涉及读取几 kB 的数据并以某种方式解析它们，可能会进行某种转换。即我预计我们需要进行大量字节寻址随机内存访问。我需要每秒执行大约 30 帧，每帧需要执行数万次此类操作（因此每秒可能执行 100 或 1000 次操作）
我不太了解 Java 的“内部结构”，但从什么角度了解 Java 的“内部结构”？我读到我相信 Java 看到的内存与操作系统本身提供的实际虚拟内存相距甚远[2]。
我应该使用哪些缓冲区管理库才能获得最佳性能？我见过一些（NIO [3]、Java 2d [4] 等），但我无法找到哪个更快，或者是否还有我缺少的其他选项。你们对我有什么建议或指示吗[5]？
我还将进行大量算术运算，那么是否有任何库可以进行“更快”的算术运算？我来自一个可以在硬件上加速几乎所有内容的世界，但现在我需要在 PC 上运行它，所以我不确定是否有任何此类选项可用。
如果你们能提供任何其他建议或帮助，我们将不胜感激！
I am a bit of a newbie to Java (prior experience with C on embedded platforms), so please forgive me if this question is very trivial.
I need to implement some signal processing algorithms in Java. I know Java is probably not the best language to do this [1], but the Java requirement has come in primarily because the rest of my team is not comfortable with C at all.
What we need to do at a high level is to read some files containing video frames, process them (gather some statistics about them) and then write them back to disk. The processing will involve reading in a few kB of data and parsing them somehow, possibly with some kind of transforms. i.e. I expect we will need to do a lot of byte-addressed random memory accesses. And I'll need to do about 30 frames per second and a few tens of thousands of such operations every frame (so possibly 100s of 1000s of ops per second)
I do not know the 'internals' of Java very well, but from what I read I believe the memory that Java sees is far abstracted from the actual virtual memory that the OS itself provides [2].
What buffer management libraries should I use so that I can get the best possible performance? I've seen a few (NIO [3], Java 2d [4], etc) but I am not able to find which is faster, or if there are any other options that I am missing. Do you guys have any suggestions or pointers [5] for me?
I will also be doing lots of arithmetic, so are there any libraries that do 'faster' arithmetic? I come from a world where I could accelerate almost everything on the hardware but now I need to run this on a PC so I am not sure if there are any such options available.
Any other suggestions or help you guys could provide will be much appreciated!
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