Programming Language EF speed test (3): fannkuch

This is a dedicatedProgramming Language/Compiler speed test/compare the questions given by the website (http://shootout.alioth.debian.org,

The following are efSource code:

// Fannkuchpublic final class startup class <author = "liigo"> {public static main () {int n = 11; int time = runtime environment. take the start time (); console. output ("pfannkuchen (", N, ") =", fannkuch (N), "/N"); console. output line ("Time (MS):", runtime environment. take the start time ()-time); console. input text ();} static int fannkuch (int n) {int [] perm = new int [N]; int [] perm1 = new int [N]; int [] Count = new int [N]; int flips; int flipsmax; int R; int I; int K; int didpr; int n1 = n-1; if (n <1) return 0; f Or (I = 0; I <n; I ++) perm1 [I] = I;/* Initial (trivial) permu */r = N; didpr = 0; flipsmax = 0; For (;) {If (didpr <30) {for (I = 0; I <n; I ++) console. output (1 + perm1 [I]); console. output line (""); didpr ++ ;}for (; R! = 1; r --) {count [r-1] = r;} If (! (Perm1 [0] = 0 | perm1 [N1] = N1) {flips = 0; for (I = 1; I <n; I ++) {perm [I] = perm1 [I];} k = perm1 [0];/* cache perm [0] In K */do {/* k! = 0 => K> 0 */Int J; For ({I = 1; j = K-1;}; I <j; {I ++; j --;}) {int t_mp = perm [I]; perm [I] = perm [J]; perm [J] = t_mp;} flips ++; /** now exchange K (caching perm [0]) and perm [k] */J = perm [k]; perm [k] = K; k = J ;} while (K! = 0); If (flipsmax <flips) {flipsmax = flips ;}}for (;) {If (r = N) {return flipsmax ;} /* rotate down perm [0 .. r] by one */INT perm0 = perm1 [0]; I = 0; while (I <r) {k = I + 1; perm1 [I] = perm1 [k]; I = K;} perm1 [R] = perm0; count [R]-= 1; if (count [R]> 0) {break ;}r ++ ;}}}}

This efProgramIt takes about 37 seconds to run on my machine.The optimized vc6 takes about 5.8 seconds.

Other Programming Language/compiler performance, please see here: http://shootout.alioth.debian.org/gp4/benchmark.php? Test = fannkuch & lang = all

In general, EF performance is not bad. It is much slower than many programming languages (such as C ++, Java, C #, D, Fortran, and Pascal), and is much slower than many other programming languages (such as Erlang, Python, Ruby, Perl, PHP, Lua, groovy, smalltalk, JavaScript) is much faster.

Further analysis: EF, as a compilation language, is generally slower than other compilation languages (after all, EF compiler has not been optimized), up to seven times slower; EF is usually faster than interpreted languages, usually several times faster, dozens of times faster, or even hundreds of times faster.

There are still a lot of test questions to continue. To learn EF language, please go to EF official blog: http://blog.csdn.net/efdev/