Beefy Boxes and Bandwidth Generously Provided by pair Networks
P is for Practical
 
PerlMonks  

Re^3: Trouble getting size of list returned from sub

by Anonymous Monk
on Nov 26, 2012 at 10:27 UTC ( #1005606=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Trouble getting size of list returned from sub
in thread Trouble getting size of list returned from sub

Without wantarray perl doesn't seem to reduce memory usage

sub mm { print( (`pslist -m $$ 2>NUL`)[-2,-1] )} sub ff { my @fudge = 1 .. 1_000_000; @fudge } sub fa { scalar @{[ &ff ]} } mm; ff; mm; warn fa; __END__ Name Pid VM WS Priv Priv Pk Faults Non +P Page perl 796 62168 46336 44336 48196 12572 +2 34 Name Pid VM WS Priv Priv Pk Faults Non +P Page perl 796 66076 50280 48252 48260 13582 +2 34 1000000 at - line 4.

Using the accumulator doesn't appear to reduce memory usage, because one function still returns a list

sub mm { print( (`pslist -m $$ 2>NUL`)[-2,-1] )} sub ff { my @fudge = 1 .. 1_000_000; @fudge } sub fa { scalar( () = &ff ) } mm; ff; mm; warn fa; __END__ Name Pid VM WS Priv Priv Pk Faults Non +P Page perl 1432 62168 46336 44336 48196 12572 +2 34 Name Pid VM WS Priv Priv Pk Faults Non +P Page perl 1432 66076 50280 48252 48260 13582 +2 34 1000000 at - line 4.

I suppose this could actually be optimized, I see no technical reason, but its fairly minor


Comment on Re^3: Trouble getting size of list returned from sub
Select or Download Code
Re^4: Trouble getting size of list returned from sub
by Anonymous Monk on Nov 26, 2012 at 10:33 UTC
    Bah, I fudged it up

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1005606]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (6)
As of 2014-09-24 04:33 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    How do you remember the number of days in each month?











    Results (245 votes), past polls