Re^2: Why it takes so much time here?

My system has 7GB memory,how can it run out of memory for 1.5GB?


[anony@dev-test test]$ free -g
             total       used       free     shared    buffers     cac
+hed
Mem:             7          1          6          0          0        
+  0
-/+ buffers/cache:          1          6
Swap:            1          1          0
[download]

Comment on Re^2: Why it takes so much time here? Download Code

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Re^3: Why it takes so much time here? by Eliya (Vicar) on Dec 28, 2011 at 03:43 UTC
My system has 7GB ... (6GB free) On my system, creating a list of 10_000_000 scalars on Perl's stack already takes roughly 700MB. So, as you have 10 times as many, 7GB is pretty close... Try this `$ perl -MList::MoreUtils -e'any {<>} 1..10_000_000'` [download] and check its memory usage with `top` or `ps` (abort with ^C).	[reply] [d/l] [select]
Re^3: Why it takes so much time here? by ikegami (Patriarch) on Dec 28, 2011 at 03:36 UTC
Ok, what about pure CPU speed limitations? 15/100,000,000 s per iteration = 0.00000015 s per iteration = 150 ns per iteration Is that unreasonable?	[reply]
Re^4: Why it takes so much time here? by PerlOnTheWay (Monk) on Dec 28, 2011 at 03:42 UTC
I printed the `time` before and after the iteration, the result is both 1325041218: `print time . "\n"; my @a = any {$_== 92} 1..100000000; print "\n"; print time;` [download] So the time is not taken by the iteration..	[reply] [d/l] [select]
Re^5: Why it takes so much time here? by ikegami (Patriarch) on Dec 28, 2011 at 04:27 UTC
oh, yes it is. `1..100000000` is executed a compile-time (constant folding).	[reply] [d/l]
Re^6: Why it takes so much time here? by PerlOnTheWay (Monk) on Dec 28, 2011 at 04:51 UTC
Re^7: Why it takes so much time here? by ikegami (Patriarch) on Dec 28, 2011 at 05:19 UTC
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