From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Ted Zlatanov <tzz@lifelogs.com>
Cc: emacs-devel@gnu.org
Subject: Re: list-print-separator
Date: Mon, 25 Apr 2011 09:41:39 -0300 [thread overview]
Message-ID: <jwvr58q33rh.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87hb9nglen.fsf@lifelogs.com> (Ted Zlatanov's message of "Sun, 24 Apr 2011 20:38:40 -0500")
TZ> Since hashtables can get pretty big, it would be nice to have a
TZ> separator between entries when they are printed. Could that be provided
TZ> at the top level, e.g.
TZ> (let ((hash-table-print-separator "\\\n"))
TZ> (format "%S" my-hash-table))
SM> How 'bout changing `pp' instead?
> I tried that (thanks for the pointer, I didn't know about it) and it was
> MUCH slower than my patch.
> Tested against a hashtable with 40K elements. My patch through `format'
> took less than 3 seconds on a modern CPU with enough memory. `pp' took
> a minute before I interrupted it.
Hmm... I wouldn't try to compare the speed of `print' with that of `pp'
since they do very different amounts of work and are implemented in
languages whose performance is very different, but there's clearly room
for improvement in pp's speed.
> I intend to use it for large objects so the performance worries me.
You could use an ad-hoc pp-like function, maybe? The way I see it, you
typically either need "fast" or "pretty" but very rarely both.
Stefan
next prev parent reply other threads:[~2011-04-25 12:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-06 10:59 entry separator for printing hashtables Ted Zlatanov
2011-04-21 23:17 ` list-print-separator (was: entry separator for printing hashtables) Ted Zlatanov
2011-04-24 4:47 ` list-print-separator Stefan Monnier
2011-04-25 1:38 ` list-print-separator Ted Zlatanov
2011-04-25 12:41 ` Stefan Monnier [this message]
2011-04-25 12:54 ` list-print-separator Ted Zlatanov
2011-04-25 14:51 ` list-print-separator Stefan Monnier
2011-04-25 15:01 ` list-print-separator Ted Zlatanov
2011-04-25 15:37 ` list-print-separator Stefan Monnier
2011-04-25 15:59 ` list-print-separator Ted Zlatanov
2011-04-25 16:55 ` list-print-separator Thierry Volpiatto
2011-04-25 17:28 ` list-print-separator Stefan Monnier
2011-04-25 17:55 ` list-print-separator Eli Zaretskii
2011-04-25 18:35 ` list-print-separator Stefan Monnier
2011-04-25 21:05 ` list-print-separator Andy Moreton
2011-04-25 22:45 ` list-print-separator Ted Zlatanov
2011-04-26 12:52 ` list-print-separator Andy Moreton
2011-04-26 12:55 ` list-print-separator Stefan Monnier
2011-04-26 15:23 ` list-print-separator Ted Zlatanov
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