On Sep 15, 2009, at 20:30, Eric Hall wrote:
On Tue, Sep 15, 2009 at 06:20:13PM -0700, [email protected]
wrote:
Revision: 57743
http://trac.macports.org/changeset/57743
Author: [email protected]
Date: 2009-09-15 18:20:06 -0700 (Tue, 15 Sep 2009)
Log Message:
-----------
ImageMagick: update to 6.5.6-1 to fix #21397 and switch to 7z
distfile because it's smaller
Is using 7z for downloads really worth the extra compile, etc.
time for the decompressor required, and the (presumably) longer
decompression time?
IMHO, definitely, which is why the use_7z option was added to MacPorts
base. Processors in today's computers are extremely fast, so the
decompression time is practically nothing. All ports should switch to
7z or similar highly-compressed alternatives to gz and bz2 if
available. lzma and xz are good choices too, though MacPorts doesn't
yet have a use_xz option. The lzma, xz and 7z formats can all use the
lzma compression algorithm.
Meanwhile, networks can be slow. While in the U.S. we may be used to
fast broadband connections with unlimited downloads for a fixed
monthly price, in other parts of the world, slower access over ISDN or
dialup is still normal, which is probably billed by the minute or by
the megabyte. Even if you're on broadband, conditions on your network
or between you and the server may make the download slow, so
decreasing the download size is good.
I did some tests on my 2.2-GHz Intel Core 2 Duo MacBook Pro running
Snow Leopard from an external 5400-RPM 2.5" SATA drive connected via
FireWire 800. Decompressing either the .7z or the .tar.bz2 version of
the ImageMagick distfile took just over 3 seconds; there was
practically no difference in time. Using .7z:
$ sudo port clean && sudo port checksum
---> Cleaning ImageMagick
---> Computing dependencies for ImageMagick
---> Fetching ImageMagick
---> Verifying checksum(s) for ImageMagick
$ time sudo port extract
---> Computing dependencies for ImageMagick
---> Extracting ImageMagick
real 0m3.142s
user 0m1.239s
sys 0m0.815s
Using .tar.bz2:
$ sudo port clean && sudo port checksum
---> Cleaning ImageMagick
---> Computing dependencies for ImageMagick
---> Fetching ImageMagick
---> Verifying checksum(s) for ImageMagick
rschm...@808 ImageMagick $ time sudo port extract
---> Computing dependencies for ImageMagick
---> Extracting ImageMagick
real 0m3.127s
user 0m2.435s
sys 0m0.605s
And compiling p7zip is a one-time operation which takes less than a
minute.
$ time sudo port install p7zip
---> Computing dependencies for p7zip
---> Fetching p7zip
---> Verifying checksum(s) for p7zip
---> Extracting p7zip
---> Applying patches to p7zip
---> Configuring p7zip
---> Building p7zip
---> Staging p7zip into destroot
---> Installing p7zip @9.04_0
---> Activating p7zip @9.04_0
---> Cleaning p7zip
real 0m47.720s
user 1m17.400s
sys 0m10.072s
The p7zip 9.04 bz2 distfile is 3.6 MB. This plus the size of the
ImageMagick 6.5.6-1 7z distfile (5.7 MB) is only slightly larger than
the size of the ImageMagick 6.5.6-1 bz2 distfile (8.6 MB). So if the
user did not already have p7zip, then it will take a little longer
this one time, but for every subsequent update, it's a win.
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