[PATCH 1/7] Makefile: Use better xz options

[Alexander Miller <alex.miller-Mmb7MZpHnFY@public.gmane.org>]

>From xz(1):
   The selected compression settings determine the memory requirements
   of the decompressor, thus using a too high preset level might make
   it painful to decompress the file on an old system with little RAM.
   Specifically, it's not a good idea to blindly use -9 for everything
   like it often is with gzip(1) and bzip2(1).

With small files like man pages, a large dictionary doesn't help at all;
so set a small dictionary size (1MiB). Also, "with text files having
one-byte alignment, setting pb=0 can improve compression slightly."
Otherwise the defaults are fine (specifically, the extreme presets
don't improve compression here and would be a waste of CPU cycles).

Signed-off-by: Alexander Miller <alex.miller-Mmb7MZpHnFY@public.gmane.org>
---
I made a few tests and the settings described above which should work
well in theory also did so in practice. The only surprise was that the
extreme presets actually compressed a little worse. Playing with the
"nice" parameter could squeeze out a few more bits, but I don't think
that would be appropriate; I don't want to optimize the settings for
the current man pages content.
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 237310d..95ffc2f 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ MANDIR=$(prefix)/share/man
 
 GZIP=gzip -9
 BZIP2=bzip2 -9
-LZMA=xz -9
+LZMA=xz --lzma2=dict=1M,pb=0
 
 all: screen remove install
 
-- 
2.7.3

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