GNU bug report logs - #33708
26.1.90; nhexl-mode performance

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Guido Kraemer <gkraemer <at> bgc-jena.mpg.de>
Subject: bug#33708: closed (Re: bug#33708: 26.1.90; nhexl-mode performance)
Date: Fri, 14 Dec 2018 22:53:02 +0000

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Your bug report

#33708: 26.1.90; nhexl-mode performance

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 33708 <at> debbugs.gnu.org.

-- 
33708: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=33708
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Guido Kraemer <gkraemer <at> bgc-jena.mpg.de>
Subject: Re: bug#33708: 26.1.90; nhexl-mode performance
Date: Fri, 14 Dec 2018 17:52:31 -0500

> - Thanks for fixing this, performance is great now!

Thanks for confirming.

> - Sorry for using that weird site for file sharing, you could have installed
> the bitcoin client (which is MIT licensed) and downloaded the
> blockchain ;-),

I hesitated to do that, indeed.

> what would you use for ad-hoc file sharing?

I'd put it on my web server, not linked from any page.

> - I think there is another minor bug: When the cursor is at the very
> beginning of the buffer and you search for the byte sequence at the very
> beginning of the file, search will jump to the second occurrence. Happens in
> the example of the original bug report.

Yeah, it's a misfeature that I'm not sure how to fix:

When you type `C-s f a`, you first search for `f` and this one is not
treated as a hex-search so it jumps to the first `f` char, so when you
get to type `a` Isearch keeps searching from that `f` rather than
restarting from the beginning of the buffer.

I could change the rule so that `C-s f` already treats `f` as
a hex-search, I guess.


        Stefan

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From: Guido Kraemer <gkraemer <at> bgc-jena.mpg.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1.90; nhexl-mode performance
Date: Tue, 11 Dec 2018 18:06:40 +0100

Filing a bug report because of the discussion on

https://emacs.stackexchange.com/questions/46492/how-to-search-for-a-sequence-of-bytes-in-hexl-mode/ 


nhexl-mode performance is really bad in large files.

Occurred in the files of the Bitcoin blockchain. The beginning of every
block is marked with the byte sequence `f9beb4d9`. Searching for this
byte sequence in nhexl-mode is really slow.

In case you do not have the bitcoin client installed, I uploaded the
first file of the blockchain here (134MB, link will be valid for 30
days):

https://ufile.io/z08bl

Thanks for looking into this.

Guido.






In GNU Emacs 26.1.90 (build 1, x86_64-pc-linux-gnu, X toolkit, Xaw 
scroll bars)
of 2018-12-01 built on uranus
Repository revision: 7851ae8b443c62a41ea4f4440512aa56cc87b9b7
Windowing system distributor 'The X.Org Foundation

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