https://issues.dlang.org/show_bug.cgi?id=16431
Issue ID: 16431 Summary: rdmd is slower than DUB Product: D Version: D2 Hardware: x86_64 OS: Linux Status: NEW Severity: normal Priority: P1 Component: tools Assignee: nob...@puremagic.com Reporter: greensunn...@gmail.com > python -m timeit -v -n 10 -s 'import os' 'os.system("dub run --single --force > foo.d")' 10 loops, best of 3: 578 msec per loop > python -m timeit -v -n 10 -s 'import os' 'os.system("rdmd --force foo.d")' 10 loops, best of 3: 730 msec per loop I used an example from the DLang Tour (see below or http://tour.dlang.io/tour/en/gems/template-meta-programming) and tested with more and the overhead seems to stay there: == Associative arrays == http://tour.dlang.io/tour/en/basics/associative-arrays rdmd 5 loops, best of 3: 637 msec per loop dub: 5 loops, best of 3: 584 msec per loop == Loops == http://tour.dlang.io/tour/en/basics/loops rdmd: 5 loops, best of 3: 488 msec per loop dub: 5 loops, best of 3: 373 msec per loop #!/usr/bin/env rdmd /+ dub.sdl: name "foo" +/ import std.traits: isFloatingPoint; import std.uni: toUpper; import std.string: format; import std.stdio: writeln; /// A Vector that just works for /// numbers, integers or floating points. struct Vector3(T) if (is(T: real)) { private: T x,y,z; /// Generator for getter and setter because /// we really hate boiler plate! /// /// var -> T getVAR() and void setVAR(T) mixin template GetterSetter(string var) { // Use mixin to construct function // names mixin("T get%s() const { return %s; }" .format(var.toUpper, var)); mixin("void set%s(T v) { %s = v; }" .format(var.toUpper, var)); } // Easily generate our getX, setX etc. // functions with a mixin template. mixin GetterSetter!"x"; mixin GetterSetter!"y"; mixin GetterSetter!"z"; public: // We don't allow the dot function // for anything but floating points static if (isFloatingPoint!T) { T dot(Vector3!T rhs) { return x*rhs.x + y*rhs.y + z*rhs.z; } } } void main() { auto vec = Vector3!double(3,3,3); // That doesn't work because of the template // constraint! // Vector3!string illegal; auto vec2 = Vector3!double(4,4,4); writeln("vec dot vec2 = ", vec.dot(vec2)); auto vecInt = Vector3!int(1,2,3); // doesn't have the function dot because // we statically enabled it only for float's // vecInt.dot(Vector3!int(0,0,0)); // generated getter and setters! vecInt.setX(3); vecInt.setZ(1); writeln(vecInt.getX, ",", vecInt.getY, ",", vecInt.getZ); } --