Hi,
On Sep 5, 2009, at 3:11 AM, John-Paul Bader wrote:
Hey guys,
a friend of mine implemented a heap in ruby for educational
purposes. He did so with several implementations. He had a few
benchmarks and I suggested to run them on macruby to see how well it
would hold up.
Unfortunately we didn't get really far because apparently there is a
problem with globbed/splatted method arguments in macruby which
raises an exception if more than 199 arguments are passed.
Can be tested easily with:
def foo(*bar); puts bar.length;end
1.upto(1000) {|x| foo(*([0]*x))}
In vm.cpp:2977 #define MAX_DISPATCH_ARGS 200 is defined and a big
fat todo is right below it addressing this issue. Now I know its not
a super urgent problem because its not what you do in ruby every
day. Still its obviously something that has to change.
In line 3003 there is this assert: assert(real_argc + count <
MAX_DISPATCH_ARGS); so it must be important i guess.
So i'm just wondering why it is limited to 200 in the first place
and if there is something I can to even though I'm not really a
capable (objective) c programmer ?
This limitation is purely temporary and is because of a limitation in
the dispatcher. This will be addressed for the release.
After commenting out the code with the globbed arguments the
benchmarks on the remaining tests ran a bit slower than on ruby 1.9.1.
Can you share these benchmarks? I would be very interested to see the
results and also if we can be better.
Laurent
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