Subject: Re: [xsl] Is xsl:for-each "syntactic sugar"? From: Mukul Gandhi <gandhi.mukul@xxxxxxxxx> Date: Fri, 7 May 2010 16:50:09 +0530 |
> the width of your CPU limiting the number of iterations. I think, the number of iterations is bound by the max-bound (on a given hardware & compiler implementation) of the type used for the iterating variable. > Also, xsl:for-each is much easier to understand than a potentially > complex recursive function (you SEE that it is a loop, while you have > NOTICE that it is recursive). very true :) > Also, xsl:for-each can (in theory) be implemented using parallel execution (multiple cores) > while recursion necessarily must be a single core as it is up to the coder where / when in > his particular algorithm the recursive call takes place. your statement, that recursion cannot be parallelized, is true to a large extent. But IMO, this cannot be generalized to every possible situation. I agree, that many "for loops" are potential candidates of parallelization. I think parallelization support for "for loops" could be available at following levels: a) a given end-user program could try to do this (if the host language provides support for parallel execution, say something like language threads). b) a language compiler could provide some support. IMO, since all "for loops" cannot be parallelized, compilers could provide parallelization support for specific scenarios. I think, the extent to which this benefit could be provided by a compiler, is dependent on a corresponding optimizer in a compiler. c) there could be some support for parallelization at hardware level. IMO, it's generally quite difficult (or impossible?) for compilers, to exploit hardware-level parallelization benefits, if the compilers are written in platform independent languages. > Totally wrong, as it is much more complex to read and understand as a simple loop. Some algorithms can be expressed naturally (and sometimes can only be), when written recursively. -- Regards, Mukul Gandhi
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