Re: Compiling C++ modules

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Fri, 28 Apr 2006, Avi Kivity wrote:

> Jan Engelhardt wrote:
>>> The high level language allows you to concentrate on the algorithms which is
>>> where the performance comes from.
>>>
>> Do you consider e.g. Perl or Python highlevel?
>>
>
> I once wrote Perl. I deeply regret the experience. But yes, they are
> both high(er) level. There are even higher levels to aspire to.
>
>> If so: I doubt that's where performance can come from. Ever. (Unless you
>> cheat by using XS.)
>>
>
> Given infinite time, patience, and concentration, the C or C++ program
> will always win over Python; as assembly will win over C or C++.
>
> If your time is bounded, your Python code might be running while you're
> still typing in your C code, you're be profiling and making changes to
> the alghorithm in Python while hunting for that mysterious segmentation
> fault in C (thank goodness for valgrind), and adding multithreading to
> the third and final version of your Python code while debating whether
> to buy more memory or sit down and chase that memory leak.
>
> Developer performance equates to runtime performance.
>

Read what you wrote! It's absolutely, incredibly stupid!

The cost in developer time is borne once. The cost of performance
is borne every time you run the application.

> ps. Yes, that wouldn't work for a simple example like counting words in
> a file. Try something more complex, like an SCM system.
>
> --
> Do not meddle in the internals of kernels, for they are subtle and quick to panic.
>
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Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.4 on an i686 machine (5592.89 BogoMips).
New book: http://www.lymanschool.com
_


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