From: Kurt Stephens <ks@...>
Date: 2009-12-01T12:50:40+09:00
Subject: [ruby-core:26966] Re: Caching #to_s for immutables (and a 	possible future for constant-folding) [with patch]

What causes this following error?:

NotImplementedError: method `method_missing' called on hidden T_STRING 
object (0x9aed298 flags=0x900805 klass=0x0)

What is a "hidden" object?

Kurt Stephens wrote:
> I just ran rubyspec against it; ~ 5% time improvement.
> 
> WITH PATCH:
> 
>  > time mspec -t /home/kurt/local/ruby/kstephens/bin/ruby
> 
> 2849 files, 13035 examples, 186461 expectations, 231 failures, 441 errors
> 
> real    4m18.626s
> user    0m23.349s
> sys    0m8.685s
> 
> WITHOUT PATCH:
> 
>  > time mspec -t /home/kurt/local/ruby/trunk/bin/ruby
> 2849 files, 13035 examples, 187339 expectations, 246 failures, 318 errors
> 
> real    4m30.655s
> user    0m28.386s
> sys    0m9.857s
> 
> Note the difference in failures/errors.  I don't know yet if these are 
> errors due to the intended semantic difference or actual bugs.  What 
> might be the best way to see the differences in object allocations and GCs?
> 
> 
> Roger Pack wrote:
>>> Yes.  The MRI test suite runs at 45 sec with these changes and at 53 sec
>>> without.  The MRI tests pass with no issues.  There is a naive test 
>>> in the
>>> attached patch that demonstrates the improvements.
>>
>> Wow that's a pretty good improvement.  I like it.
>>
>> What's the speed difference for make test-all?
>>
> Didn't know about test-all.  Right now test-all has some failures 
> related to frozen String.  So there is still more work to be done. :(
> 
> 6836 tests, 1826745 assertions, 56 failures, 248 errors, 0 skips
> make: *** [yes-test-all] Error 1
> 
> real    4m23.824s
> user    1m45.195s
> sys    0m27.594s
> 
>>>> Does it break rails?
>>> I don't know yet.  I need to setup a proper Rails test environment.
>>
>> Yeah that would be nice, as well as comparing speeds for the test runs
>> to see if it's useful.
>>
>>> There maybe some native thread issues with the cache hash tables, but 
>>> I did
>>> start adding a mutex to each one.  I have not tested on 64-bit or 
>>> anything
>>> other that Ubunutu 9.10.
>>
>> Would there be thread issues if each thread runs under the GLI?
>>
>> Thanks.
>> -r
>>
> 
>