From: Philip Rhoades <phil@...>
Date: 2008-06-25T02:42:33+09:00
Subject: Re: Performance improvement possible?

Robert,


Robert Klemme wrote:
> On 24.06.2008 18:23, Philip Rhoades wrote:
>> People,
>>
>> I have asked before about Ruby to C conversion programs and other 
>> alternatives with no really satisfactory solution for my particular 
>> situation.  I decided to test out a conversion of one of the C 
>> programs and see what sort of results I get.  This particular small C 
>> program is called 32,000 times from loops within a shell script.  The 
>> program then processes a text file, writes a text file and exits.  The 
>> same shell script with a Ruby program replacing the C program does 
>> exactly the same thing but takes 8.5 times as long (27m/227m).
>>
>> The profile on ONE execution of the Ruby program produced:
>>
>>    %   cumulative   self              self     total
>>   time   seconds   seconds    calls  ms/call  ms/call  name
>>   65.18    14.15     14.15        1 14150.00 21700.00  Array#each
>>   12.44    16.85      2.70    93792     0.03     0.03  Array#[]
>>    8.15    18.62      1.77    62108     0.03     0.03  String#split
>>    6.73    20.08      1.46    53215     0.03     0.03  String#==
>>    2.58    20.64      0.56       66     8.48    12.73  Range#each
>>
>> It would be SO much nicer to rewrite some stuff that needs rewriting 
>> and write ALL new stuff in Ruby but this looks impossible with these 
>> times . .
>>
>> Any suggestions for performance improvements?
> 
> Difficult without seeing the Ruby program.  But I'd also start with 
> rewriting the script in Ruby so you do not have multiple processes.


Yes, that seems like a good start.

Thanks,

Phil.
-- 
Philip Rhoades

Pricom Pty Limited  (ACN 003 252 275  ABN 91 003 252 275)
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Australia
E-mail:  phil@pricom.com.au