我不时地读到Fortran在繁重的计算中比C更快。这是真的吗?我必须承认我几乎不懂Fortran,但是到目前为止我看到的Fortran代码并没有显示出该语言具有C语言所不具备的特性。
如果是真的,请告诉我原因。请不要告诉我什么语言或库适合处理数字,我不打算写一个应用程序或库来做这个,我只是好奇。
我不时地读到Fortran在繁重的计算中比C更快。这是真的吗?我必须承认我几乎不懂Fortran,但是到目前为止我看到的Fortran代码并没有显示出该语言具有C语言所不具备的特性。
如果是真的,请告诉我原因。请不要告诉我什么语言或库适合处理数字,我不打算写一个应用程序或库来做这个,我只是好奇。
当前回答
The faster code is not really up to the language, is the compiler so you can see the ms-vb "compiler" that generates bloated, slower and redundant object code that is tied together inside an ".exe", but powerBasic generates too way better code. Object code made by a C and C++ compilers is generated in some phases (at least 2) but by design most Fortran compilers have at least 5 phases including high-level optimizations so by design Fortran will always have the capability to generate highly optimized code. So at the end is the compiler not the language you should ask for, the best compiler i know is the Intel Fortran Compiler because you can get it on LINUX and Windows and you can use VS as the IDE, if you're looking for a cheap tigh compiler you can always relay on OpenWatcom.
更多信息: http://ed-thelen.org/1401Project/1401-IBM-Systems-Journal-FORTRAN.html
其他回答
The faster code is not really up to the language, is the compiler so you can see the ms-vb "compiler" that generates bloated, slower and redundant object code that is tied together inside an ".exe", but powerBasic generates too way better code. Object code made by a C and C++ compilers is generated in some phases (at least 2) but by design most Fortran compilers have at least 5 phases including high-level optimizations so by design Fortran will always have the capability to generate highly optimized code. So at the end is the compiler not the language you should ask for, the best compiler i know is the Intel Fortran Compiler because you can get it on LINUX and Windows and you can use VS as the IDE, if you're looking for a cheap tigh compiler you can always relay on OpenWatcom.
更多信息: http://ed-thelen.org/1401Project/1401-IBM-Systems-Journal-FORTRAN.html
I think the key point in favor of Fortran is that it is a language slightly more suited for expressing vector- and array-based math. The pointer analysis issue pointed out above is real in practice, since portable code cannot really assume that you can tell a compiler something. There is ALWAYS an advantage to expression computaitons in a manner closer to how the domain looks. C does not really have arrays at all, if you look closely, just something that kind of behaves like it. Fortran has real arrawys. Which makes it easier to compile for certain types of algorithms especially for parallel machines.
在运行时系统和调用约定等方面,C语言和现代的Fortran非常相似,很难看出有什么不同。注意,这里的C实际上是基础C: c++是一个完全不同的问题,具有非常不同的性能特征。
使用现代标准和编译器,不!
Some of the folks here have suggested that FORTRAN is faster because the compiler doesn't need to worry about aliasing (and hence can make more assumptions during optimisation). However, this has been dealt with in C since the C99 (I think) standard with the inclusion of the restrict keyword. Which basically tells the compiler, that within a give scope, the pointer is not aliased. Furthermore C enables proper pointer arithmetic, where things like aliasing can be very useful in terms of performance and resource allocation. Although I think more recent version of FORTRAN enable the use of "proper" pointers.
对于现代实现,C通用优于FORTRAN(尽管它也非常快)。
http://benchmarksgame.alioth.debian.org/u64q/fortran.html
编辑:
一个公平的批评似乎是,基准测试可能是有偏见的。这里是另一个来源(相对于C),将结果放在更多的上下文中:
http://julialang.org/benchmarks/
你可以看到C在大多数情况下优于Fortran(再次看到下面的批评也适用于这里);正如其他人所指出的,基准测试是一门不精确的科学,很容易偏袒一种语言而不是其他语言。但它确实说明了Fortran和C语言有相似的性能。
Fortran和C语言在特定目的上并没有哪一种语言比另一种更快。对于每种语言的特定编译器,有些编译器比其他编译器更适合某些任务。
多年来,Fortran编译器一直存在,它可以对你的数字例程施黑魔法,使许多重要的计算变得异常快速。当代的C编译器无法做到这一点。因此,在Fortran中出现了许多伟大的代码库。如果您想要使用这些经过良好测试的、成熟的、出色的库,就需要使用Fortran编译器。
我的非正式观察表明,如今人们用任何古老的语言来编码他们繁重的计算内容,如果这需要一段时间,他们就会在一些廉价的计算集群上找到时间。摩尔定律让我们所有人都成了傻瓜。
我是一个业余程序员,在这两种语言上我都是“平均”。 我发现编写快速Fortran代码比编写C(或c++)代码更容易。Fortran和C都是“历史悠久”的语言(按照今天的标准),被大量使用,并且很好地支持免费和商业编译器。
我不知道这是否是一个历史事实,但Fortran感觉它是为并行/分布式/向量化/多核化而构建的。今天,当我们谈论速度时,它几乎是“标准度量”:“它能缩放吗?”
对于纯粹的cpu计算,我喜欢Fortran。对于任何与IO相关的东西,我发现使用c更容易(无论如何这两种情况都很困难)。
当然,对于并行计算密集型代码,你可能需要使用GPU。C和Fortran都有很多或多或少很好地集成了CUDA/OpenCL接口(现在还有OpenACC)。
我比较客观的回答是:如果你对这两种语言都同样了解或不了解,那么我认为Fortran更快,因为我发现用Fortran写并行/分布式代码比用c更容易(一旦你明白你可以写“自由形式”Fortran,而不仅仅是严格的F77代码)
Here is a 2nd answer for those willing to downvote me because they don't like the 1st answer : Both language have the features required to write high-performance code. So it's dependent of the algorithm you're implementing (cpu intensive ? io intensive ? memory intensive?), the hardware (single cpu ? multi-core ? distribute supercomputer ? GPGPU ? FPGA ?), your skill and ultimately the compiler itself. Both C and Fortran have awesome compiler. (i'm seriously amazed by how advanced Fortran compilers are but so are C compilers).
PS:我很高兴你特别排除了库,因为我有很多关于Fortran GUI库的不好的东西要说。:)