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Re^4: Optimization, side-effects and wrong code

by leriksen (Curate)
on Sep 30, 2004 at 02:28 UTC ( #395220=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Optimization, side-effects and wrong code
in thread Optimization, side-effects and wrong code

Reverend,

Can you tell us the method you used to get the memory figures ? And your platform/perl details too ?
I ran your snippets on my RH9 with perl, v5.8.0 built for i386-linux-thread-multi and I made one change to snippet C to

perl -le '%hash = (1 .. 1000000); for (keys %hash) { print ">"; <STDI +N> ; exit}'

to ease the snippets death.

I just used top to look at the Size column, and my results are

COUNTa memb memc mema-b changea-c change
100,00010,960 11,984 11,004 1,024 (9.3%) 44 (0.4%)
1,000,00094,324101,00094,4606,676 (7.1%)136 (0.1%)

Note the top in RH9 truncates snippet B, 1,000,000 items to 101M, and I haven't figured out how to change the units for this field - perhaps I need to use something other than top...

So in conclusion, I agree, it does appear there is some optimisation going on - is this an example of lazy evaluation ?

use brain;


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