GNU bug report logs - #917
Too heavy consing in MULE file saving?

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Richard M. Stallman" <rms <at> gnu.org>
To: emacs-pretest-bug <at> gnu.org
Subject: Too heavy consing in MULE file saving?
Date: Sun, 07 Sep 2008 13:40:00 -0400

I have gc-cons-threshold at 400000, which is the default.
In Rmail, if I type d u C-x C-s, it causes a GC at the end
of saving.  I can do this over and over and it GCs every time.

I think this indicates a bug; namely, that something is doing too much
consing.

My Rmail file is around 10 meg, and has 471 messages.
But I don't see why that should matter for C-x C-s.

Just to explore, I visited another 10meg file in Fundamental mode
and got the same behavior.  I went to the end and type 1 DEL C-x C-s.
It gc's each time.

Then I tried visiting it with find-file-literally.
That way, I could type 1 DEL C-x C-s and it would save without gc.

So I think something concerned with Mule is doing too much consing.

Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: rms <at> gnu.org, 917 <at> debbugs.gnu.org
Cc: emacs-pretest-bug <at> gnu.org
Subject: Re: bug#917: Too heavy consing in MULE file saving?
Date: Sun, 07 Sep 2008 22:01:14 +0300

> From: "Richard M. Stallman" <rms <at> gnu.org>
> Date: Sun, 07 Sep 2008 13:40:00 -0400
> Cc: 
> 
> My Rmail file is around 10 meg, and has 471 messages.
> But I don't see why that should matter for C-x C-s.
> 
> Just to explore, I visited another 10meg file in Fundamental mode
> and got the same behavior.  I went to the end and type 1 DEL C-x C-s.
> It gc's each time.
> 
> Then I tried visiting it with find-file-literally.
> That way, I could type 1 DEL C-x C-s and it would save without gc.
> 
> So I think something concerned with Mule is doing too much consing.

I'm not surprised: saving a file visited non-literally causes its
contents to be encoded, which generally means we wipe out the text and
replace it with its encoded representation.  That this conses _a_lot_,
especially for large files, does not come as a surprise to me.
Perhaps I'm missing something, though.

Message #20 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Richard M. Stallman" <rms <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>, 917 <at> debbugs.gnu.org
Cc: 917 <at> debbugs.gnu.org, bug-submit-list <at> donarmstrong.com,
        emacs-pretest-bug <at> gnu.org, bug-gnu-emacs <at> gnu.org
Subject: Re: bug#917: Too heavy consing in MULE file saving?
Date: Mon, 08 Sep 2008 05:22:27 -0400

    I'm not surprised: saving a file visited non-literally causes its
    contents to be encoded, which generally means we wipe out the text and
    replace it with its encoded representation.  That this conses _a_lot_,
    especially for large files, does not come as a surprise to me.

It seems to be a recent change, so I think it is worth investigating
whether something just increased the amount of consing done by encoding.
It would be worth optimizing this.

Message #35 received at control <at> debbugs.gnu.org (full text, mbox):

From: Chong Yidong <cyd <at> stupidchicken.com>
To: control <at> debbugs.gnu.org
Subject: close 1382
Date: Thu, 24 Jun 2010 14:23:29 -0400

severity 135 minor
tags 710 + moreinfo unreproducible
close 756
tags 844 + moreinfo unreproducible
close 917
close 1000
tags 1125 + moreinfo unreproducible
close 1159
severity 1238 wishlist
close 1247
close 1381
close 1382
tags 1708 + moreinfo unreproducible
close 1993
severity 2024 wishlist
close 2236
severity 2299 wishlist
tags 2394 + moreinfo unreproducible
severity 2507 minor
close 2583
tags 2690 + moreinfo unreproducible
tags 2812 + moreinfo unreproducible
tags 2843 + moreinfo unreproducible
tags 2870 + moreinfo unreproducible
tags 2877 + moreinfo unreproducible
close 3032
close 3273
close 3349
close 4046
close 4358
close 4591
close 4656
thanks

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