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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <151204094331.ZM16171@torch.brasslantern.com>
Date: Fri, 4 Dec 2015 09:43:31 -0800
In-Reply-To: <CAKc7PVAoYEZCJvpw-CF5=cbiZSeg3uO8FaJD2Ee6CkL71R+h4Q@mail.gmail.com>
Comments: In reply to Sebastian Gniazdowski <sgniazdowski@gmail.com>
        "Single-run while makes script fast" (Dec  4,  5:20pm)
References: <CAKc7PVAoYEZCJvpw-CF5=cbiZSeg3uO8FaJD2Ee6CkL71R+h4Q@mail.gmail.com>
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To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Single-run while makes script fast
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On Dec 4,  5:20pm, Sebastian Gniazdowski wrote:
} 
} I attach animated gif showing the effect. The while loop in following
} code makes whole script fast:

By code examination rather than actual experiment --

The difference when the while-loop is introduced is that the entire
heap allocated by body=(...) is discarded with a single popheap() at
the "done", whereas without the loop the space is reclaimed by a call
to freeheap() which has to examine every heap arena.

You should be able to get the same effect with "repeat 1" so as not
to need the loop-counter variable.

This might indicate that the exec*() routines in Src/loop.c are not
doing as much as they could to keep memory footprint to its minimum.