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Re^2: Is there a difference in this declaration?

by DrHyde (Prior)
on May 14, 2014 at 10:45 UTC ( #1086008=note: print w/replies, xml ) Need Help??

in reply to Re: Is there a difference in this declaration?
in thread Is there a difference in this declaration?

As we speak I have a script running which is consuming *two* expensive resources - CPU and disk I/O. It started running on April the 21st. It is now the 14th of May and I expect it to finish in the wee small hours of the 15th. It even spends a lot of that time in some tight loops, as it is producing summaries of a very large data-set.

However, "optimizations" like worrying about whether I initialize my variables are foolish. I have loads of far better optimizations. For example, my script runs exactly as parallel as is most efficient, all the time. This means that it uses all the CPU cores available while minimizing conflicts over resources.

If I care to optimize it further I will minimize disk I/O. But the time taken for disk I/O is only about 20% of the time taken by the process, so we're already getting into the stage where the amount of time it would take to optimize the code or the money it would take to invest in more memory (so less use of disk for intermediate results) or an SSD (just as much disk I/O but contention matters less) isn't really worth it.

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Re^3: Is there a difference in this declaration?
by wjw (Priest) on May 14, 2014 at 13:48 UTC
    Thanks for that! It validates most of what I thought and answers the question: (would it be written in Perl?).

    Clearly it would and is.

    I have to imagine it must be pretty satisfying to come to work each day and see that code chunking away!

    Again, thanks!

    ...the majority is always wrong, and always the last to know about it...
    Insanity: Doing the same thing over and over again and expecting different results...

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