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rdmd runs dmd twice for single-files with no dependencies
Transferred from: https://issues.dlang.org/show_bug.cgi?id=16431
User @wilzbach reported (2016-Aug-25 20:50:41):
$ 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); }
User @ag0aep6g responded (2016-Aug-25 21:26:33):
I don't think this is much of a surprise. rdmd detects dependencies. dub doesn't seem to do that.
User @wilzbach responded (2016-Aug-26 02:00:56):
I don't think this is much of a surprise. rdmd detects dependencies. dub doesn't seem to do that.
Well, it still seems unnecessary to me to run the full-blown CTFE compiler twice on a file. I gave it a quick try with two hacks:
https://github.com/dlang/tools/pull/191
User @ag0aep6g responded (2016-Aug-26 13:08:02):
(In reply to greensunny12 from comment 2)
Well, it still seems unnecessary to me to run the full-blown CTFE compiler twice on a file.
Sure. If you make rdmd faster, that's great. I just don't think that dub has anything to do with it.
User @AndrejMitrovic responded (2016-Aug-31 21:30:26):
Fixed right? Closing.
User @wilzbach responded (2017-Jul-20 20:07:38):
PR was reverted :/
User @marler8997 responded (2017-Dec-14 16:37:33):
Potential fix: https://github.com/dlang/tools/pull/271 "Use "-i" to prevent rdmd from having to invoke compiler twice."
Depends on this first: https://github.com/dlang/dmd/pull/7099 "Enable automatic compiling of imports"
User @marler8997 responded (2018-Jan-17 02:39:18):
https://github.com/dlang/tools/pull/271
User @marler8997 responded (2018-Jan-20 02:21:14):
https://github.com/dlang/tools/pull/271 was reverted