Re: Strange memory growth

In lvalue context,

$var->{$key}
[download]

is equivalent to

( $var //= {} )->{$key}
[download]

defined( $cg->{mainsnak}{datavalue}{value}{notexist} )
[download]

is equivalent to

defined( ( ( ( ( $cg //= {} )->{mainsnak} //= {} )->{datavalue} //= {}
+ )->{value} //= {} )->{notexist} )
[download]

That could potentially create a lot of new hashes.

Solution 1:

if (           $cg
   &&          $cg->{mainsnak}
   &&          $cg->{mainsnak}{datavalue}
   &&          $cg->{mainsnak}{datavalue}{value}
   && defined( $cg->{mainsnak}{datavalue}{value}{notexist} )
) {
   ...
}
[download]

Solution 2:

no autovivification;
if (defined( $cg->{mainsnak}{datavalue}{value}{notexist} )) {
   ...
}
[download]

Comment on Re: Strange memory growth Select or Download Code

Replies are listed 'Best First'.
Re^2: Strange memory growth by tinita (Parson) on Feb 14, 2018 at 18:50 UTC
That could potentially create a lot of new hashes. But only three, and $cg (and $jp) fall out of scope after every iteration. I can't see why this would continually increase memory.	[reply]
Re^3: Strange memory growth by ikegami (Patriarch) on Feb 14, 2018 at 18:54 UTC
Indeed. As such, I find it hard to believe the line you identified has anything to do with a memory leak. Is that the program you actually ran?	[reply]
Re^4: Strange memory growth by tinita (Parson) on Feb 14, 2018 at 18:56 UTC
I find it hard to believe the line you identified has anything to do with it, then. I'm not the author of the question.	[reply]

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