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Re^3: Avoiding memory loss...

by LanX (Bishop)
on Dec 27, 2012 at 23:39 UTC ( #1010597=note: print w/replies, xml ) Need Help??

in reply to Re^2: Avoiding memory loss...
in thread Avoiding memory loss...

> No, perl doesn't use a garbage collector.

most probably a problem of fuzzy terminology¹, perldoc talks about "garbage collection":

 Perl uses a fast and simple, reference-based garbage collection system

see perlobj#Two-Phased-Garbage-Collection

But as opposed to mark-and-sweep Perl's runtime approach is very simple an efficient.

OTOH it can't handle circular references.

And even if mark-and-sweep was used, IIRC Python does it and is still very performant. ²

Cheers Rolf


¹) from perlglossary

garbage collection A misnamed feature--it should be called, "expecting your mo +ther to pick up after you". Strictly speaking, Perl doesn’t do thi +s, but it relies on a reference-counting mechanism to keep things +tidy. However, we rarely speak strictly and will often refer to t +he reference-counting scheme as a form of garbage collection. + (If it’s any comfort, when your interpreter exits, a "real" gar +bage collector runs to make sure everything is cleaned up if you +’ve been messy with circular references and such.)

²) more complicated: "While Python uses the traditional reference counting implementation, it also offers a cycle detector that works to detect reference cycles."

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[nysus]: What happened to the submit button? All I have is a preview button.
[erix]: perlmonks has become read-only ?
[marto]: erix unlikely, we've had posts within the last few minutes ;)
[ambrus]: nysus: make sure you enter at least two lines for the title and then preview, and read warnings the preview form prints
[davies]: There is an option (I have it set) to force preview before submission. Perhaps your option has been set (accidentally?) and you are not expecting it.
[ambrus]: sorry, I mean at least two words for the title and then preview
[ambrus]: davies: that option is the default. and it's not really "force", it just hides the button.
[marto]: yes, not reading the errors displayed has been a cause of this type of report in the past
[nysus]: Ambrus, ah. I think that was the problem. I'll try. Thanks!

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