From: Michael Heerdegen <michael_heerdegen@web.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: help-gnu-emacs@gnu.org
Subject: Re: profiler-report seems to be missing data?
Date: Thu, 16 Aug 2018 17:32:32 +0200 [thread overview]
Message-ID: <87600ae38v.fsf@web.de> (raw)
In-Reply-To: <83600aiec6.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 16 Aug 2018 17:19:21 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
> In that case, perhaps the bindings done by let* take a lot of time
> because these are variables that become local when set, and you have
> many buffers in your session?
I think you are right - one doesn't even have to bind buffer local
variables to get a profiler report where 'let' takes a lot of time
though nothing inside 'let' seems to be responsible. If I profile this
for example:
#+begin_src emacs-lisp
(defun test ()
(interactive)
(mapcar (lambda (x)
(let ((y1 1)
(y2 2)
(y3 3))
(ignore y3)
(cons x (cons y1 y2))))
(number-sequence 1 1000000))
nil)
#+end_src
I get a similar profiler report. Obviously, the list mapped over is so
huge that simply binding the variables inside the loop takes a
significant part of time if the rest is fast (calling 'cons' in
the example, 'puthash' in the code we speak about). Things will be
different when running byte compiled code, I guess.
Michael.
next prev parent reply other threads:[~2018-08-16 15:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-15 15:00 profiler-report seems to be missing data? Charlie Andrews
2018-08-15 18:46 ` Eli Zaretskii
2018-08-16 13:47 ` Charlie Andrews
2018-08-16 14:19 ` Eli Zaretskii
2018-08-16 15:32 ` Michael Heerdegen [this message]
2018-08-16 17:12 ` Charlie Andrews
2018-08-16 17:28 ` Eli Zaretskii
2018-08-16 17:33 ` Charlie Andrews
2018-08-16 18:00 ` Eli Zaretskii
2018-08-16 18:48 ` Michael Heerdegen
2018-08-16 18:59 ` Eli Zaretskii
2018-08-16 18:54 ` Michael Heerdegen
2018-08-16 22:47 ` Stefan Monnier
2018-08-17 15:36 ` Charlie Andrews
2018-08-19 5:06 ` Stefan Monnier
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