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Re: funcall consing
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From: |
LdBeth |
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Subject: |
Re: funcall consing |
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Date: |
Fri, 31 Dec 2021 23:09:56 +0800 |
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User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (Gojō) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.2 (x86_64-apple-darwin18.7.0) MULE/6.0 (HANACHIRUSATO) |
>>>>> In <83fsq9gdhw.fsf@gnu.org>
>>>>> Eli Zaretskii <eliz@gnu.org> wrote:
Tomas> (benchmark-run 10 (dotimes (i 100000) (1+ i)))
Tomas> ;;(2.720941123 40 1.7525918699999998)
Tomas> (let ((x (lambda (i) (1+ i)))) (benchmark-run 10 (dotimes (i 100000)
(funcall x i))))
Tomas> ;;(4.9373091140000005 80 3.4835688719999958)
Eli> What do you mean by "consing" in this context, and what is your
Eli> evidence for "consing" in the above example? Is that only the
Eli> performance degradation, or is that something else?
Tomas probably means this (from the docstring of benchmark-run):
Return a list of the total elapsed time for execution, the number of
garbage collections that ran, and the time taken by garbage collection.
> (4.9373091140000005 80 3.4835688719999958)
The `80' indicats the GC has been invoked 80 times. That is the direct
indication of "consing".
--
LDB