On 8/4/09 8:30 AM, "Alvaro Herrera" <alvherre@xxxxxxxxxxxxxxxxx> wrote: > Merlin Moncure escribió: >> On Mon, Aug 3, 2009 at 5:30 PM, PFC<lists@xxxxxxxxxx> wrote: >>> >>>> lzo is much, much, (much) faster than zlib. Note, I've tried several >>> >>> decompression speed is even more awesome... >>> >>>> times to contact the author to get clarification on licensing terms >>>> and have been unable to get a response. >>> >>> lzop and the LZO library are distributed under the terms of the GNU General >>> Public License (GPL). >>> source : http://www.lzop.org/lzop_man.php >> >> yeah...I have another project I'm working on that is closed source, >> plus I was curious if something could be worked out for pg...lzo seems >> ideal for database usage. > > I think this was already discussed here. It turns out that a specific > exception for PG wouldn't be acceptable because of the multiple > commercial derivates. LZO would have to become BSD, which presumably > the author just doesn't want to do. > > Maybe we could have a --enable-lzo switch similar to what we do with > readline. Of course, a non-LZO-enabled build would not be able to read > a dump from such a build. (We could also consider LZO for TOAST > compression). > There are a handful of other compression algorithms very similar to LZO in performance / compression level under various licenses. LZO is just the best known and most widely used. http://www.fastlz.org/ (MIT) http://www.quicklz.com/ (GPL again) http://oldhome.schmorp.de/marc/liblzf.html (BSD -ish) ZFS uses LZJB (CDDL) source code here: http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/os/ compress.c (a good read for one of the most simple LZ compression algorithms in terms of lines of code -- about 100 lines) Fastlz, with its MIT license, is probably the most obvious choice. > -- > Alvaro Herrera http://www.CommandPrompt.com/ > PostgreSQL Replication, Consulting, Custom Development, 24x7 support > > -- > Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance > -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
