Since we're talking Windows here, the OP needs to use double quotes in the first case, and to reverse single-for-double and vice-versa in the second...
perl -e "while(1) {$x++}"
perl -e "$x='' x 1024 x 1024 x 256; while(1) { $x=~s/ /./g; $x=~s/./ /g;}"
Interestingly, at least to me, in the second case I saw the handle count rise rapidly (well, over the course of a few tens of seconds), with "Available" physical memory actually increasing (mostly, there were a few small dips). That seems counterintutitive.
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