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$ perl -s -e'
 sub mymem { system("ps -q $$ -o vsz") };
...
333528
$ perl -E'say $^V'
v5.24.1

Select or download this

$ perl -s -e'
 sub mymem { system("ps -q $$ -o vsz") };
 mymem();
...
 96852
   VSZ
573664