in reply to
Re: What is PERL_COPY_ON_WRITE Compile Option About
in thread What is PERL_COPY_ON_WRITE Compile Option About
Here is what I just found at
"Currently in perl when you write $a = $b, the contents of $b are immediately copied into $a. In theory perl could just pretend that it did the copy, and only actually do it if one of $a or $b is modified. If $b is a large string, and $a is never modified this could potentially be a big efficiency gain. This talk consists of simple pictures - how I didn't do it, and how I did."