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Bug#492086: marked as done ([optimization] partman: menus are very slow)

Your message dated Sat, 29 Jan 2011 00:51:29 +0000
with message-id <201101290051.30369.elmig@debianpt.org>
and subject line 
has caused the Debian Bug report #256237,
regarding [optimization] partman: menus are very slow
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
256237: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=256237
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Subject: partman: menus are very slow
Package: debian-installer
Severity: wishlist

*** Please type your report below this line ***
The menus used by the partition manager during an install in low-memory mode
are very slow.  Several seconds elapse between <Enter> and the next menu.  This
is too long.  The delay should be 1/2 second or less, similar to the reponse
for choosing timezone (continent, country, zone) at the beginning of install.

Examining /lib/partman/lib/base.sh, the culprit is the intensive use of
constructs such as  "$(cat $dir/default_response)".  This takes way too long.

First, avoid searching for "cat" every time.  The default search tries:
   /usr/local/sbin/cat
   /usr/local/bin/cat
   /usr/sbin/cat
   /usr/bin/cat
   /sbin/cat
before finding /bin/cat.  Instead: use 'which' or 'type' to do the search once,
assign the result to a local variable, and expand the variable instead of
searching:
   CAT=$(which cat)
   $($CAT $dir/default_response)
Or, in nearly all cases the result is known ahead of time:
   CAT=/bin/cat

Second, use a shell builtin if possible:
   $(< $dir/default_response)
which is documented and works in bash.  The current version 0.5.4-11
of 'ash' does not complain, but also does not give the correct result.

Third, use shell text strings where possible:
   PM':'$dir':'default_response=$( ... )   # capture value as text
   $PM':'$dir':'default_response   # expand text variable
This is a good candidate for the fastest possible method, although it looks
ugly.

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: armel (armv5tel)

Kernel: Linux 2.6.25-2-ixp4xx
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/bash

--

--- End Message ---
--- Begin Message --- 
Hi, 

I have done myself several installations on virtual machines and on a netbook 
with a modest performance and while using the current release the 
responsivness on the installation experience it's very acceptable.
See Colin's comments on the improvements made on partman.

I am closing the report as the behaviour it's much different from when it was 
reported (releases ago).

Feel free to try the current installer release [1] (Debian Squeeze RC2) and 
report on your installation experience with the current installer.

1 - http://www.debian.org/devel/debian-installer/

-- 
Melhores cumprimentos/Best regards,

Miguel Figueiredo
http://www.DebianPT.org

--- End Message ---
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