Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re^2: Possibly silly perl memory allocation question, duplicating scalars

by periapt (Hermit)
on Dec 15, 2004 at 14:37 UTC ( #415032=note: print w/ replies, xml ) Need Help??


in reply to Re: Possibly silly perl memory allocation question, duplicating scalars
in thread Possibly silly perl memory allocation question, duplicating scalars

This is an interesting technique. I have a couple of questions though.

I'm not clear what the effect of the statement <STDIN> is after printf 'Check'? It waits for input but doesn't assign the input to anything. The docs don't talk about using <> without an assignment (except in a conditional). Would this be considered a void or boolean context? Your output shows some process info on the same line as check. Is that a side effect? Is that result OS specific? I get nothing back on my system (WinXP w/Activstate 5.6.1)?

Is the NULL value at the end of $bigScalar necessary as a perl internal or are you using it as an end of file marker for program control?

Just curious. Thanks for an interesting half hour.


PJ
use strict; use warnings; use diagnostics;


Comment on Re^2: Possibly silly perl memory allocation question, duplicating scalars
Re^3: Possibly silly perl memory allocation question, duplicating scalars
by BrowserUk (Pope) on Dec 15, 2004 at 14:52 UTC

    The <STDIN> is there purely to make the program stop and wait at that point while I 'Check' the memory consumption in the task manager. The void context simply means that whatever input is typed, it is simply discarded.

    The memory figures you see are just what I typed at that point so as to record that information as a part of teh console log. They are the "Memory usage" and "VM size" figures from the Task Manager Processes tab.

    The null byte I write could be any value. You just have to write something, after you do the seek, to cause the 'file' to be extended to that point. Just as would with a normal file.


    Examine what is said, not who speaks.        The end of an era!
    "But you should never overestimate the ingenuity of the sceptics to come up with a counter-argument." -Myles Allen
    "Think for yourself!" - Abigail        "Time is a poor substitute for thought"--theorbtwo         "Efficiency is intelligent laziness." -David Dunham
    "Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon
      OK, great. Thanks

      PJ
      use strict; use warnings; use diagnostics;

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://415032]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (9)
As of 2015-07-02 01:38 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (25 votes), past polls