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bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26
From: |
Noam Postavsky |
Subject: |
bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26 |
Date: |
Thu, 22 Feb 2018 20:49:23 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) |
Drew Adams <drew.adams@oracle.com> writes:
> Can someone please confirm that they can repro this problem?
I can reproduce on a Windows 10 box. It looks like something was being
cached before, where now it's not. E.g., try the following function
(char-names as defined in your throw-mule-bug-2.el). In Emacs 24,
there's only one slow call.
(defun my-test-each-char ()
(interactive)
(view-echo-area-messages)
(pcase-dolist (`(,name . ,ch) char-names)
(read-char (format "continue? (next: %s)" name))
(let ((t0 (current-time))
dt displayable)
(setq displayable (char-displayable-p ch))
(setq dt (subtract-time (current-time) t0))
(message "%s display:%s (%fs)" name displayable (float-time dt)))))
Doing (setq inhibit-compacting-font-caches t) brings back reasonable
performance.
I can't reproduce on my GNU/Linux box, although that may just be due to
different fonts installed. In particular, char-displayable-p never gave
me nil.
bug#30539: 26.0; `char-displayable-p' is much slower in Emacs 25 and 26, Charles A. Roelli, 2018/02/28