??>> SLSIA. I create a brand new BDB-backed elephant repository ??>> and it takes up 40MB of disk space. Why?
LPP> Elephant creates some btrees as part of repository initialization. LPP> What you're seeing is probably a combination of BDB log files (try to LPP> invoke db_archive with the -d switch[1]) and preallocated disk space LPP> (to avoid excessive fragmentation when the tree is filled). You're right, but files it pre-allocates are sparse, which means it's much less of a problem w.r.t. disk space. Here're results of my investigation (as seen in comp.lang.lisp): ---- BerkeleyDB creates large files for its work: a...@debetch:~/foobla$ ls -l -rw-r----- 1 alex alex 24576 2010-04-21 01:37 __db.001 -rw-r----- 1 alex alex 1327104 2010-04-21 01:37 __db.002 -rw-r----- 1 alex alex 26222592 2010-04-21 01:37 __db.003 -rw-r----- 1 alex alex 98304 2010-04-21 01:37 __db.004 -rw-r----- 1 alex alex 557056 2010-04-21 01:37 __db.005 -rw-r----- 1 alex alex 253952 2010-04-21 01:37 __db.006 -rw-r----- 1 alex alex 40960 2010-04-21 01:33 %ELEPHANT -rw-r----- 1 alex alex 16384 2010-04-21 01:32 %ELEPHANTDUP -rw-r----- 1 alex alex 16384 2010-04-21 01:33 %ELEPHANTOID -rw-r----- 1 alex alex 10485760 2010-04-21 01:33 log.0000000001 But those files are sparse, they do not eat space on disk until they are populated: a...@debetch:~/foobla$ du -h 2.0M . a...@debetch:~/foobla$ du -h * 12K __db.001 1.1M __db.002 296K __db.003 24K __db.004 364K __db.005 16K __db.006 40K %ELEPHANT 16K %ELEPHANTDUP 16K %ELEPHANTOID 104K log.0000000001 a...@debetch:~$ tar czf foobla.tgz foobla a...@debetch:~$ ls -l foobla.tgz -rw-r--r-- 1 alex alex 86029 2010-04-21 01:40 foobla.tgz Well, if you use filesystem which supports sparse files. If you don't like this anyway, you can configure BDB to allocate smaller files. File __db.003 seems to be related to cache size, default cache in config.sexp is 20MB. If you set it to 256KiB (default for BDB) in my-config.sexp: (:BERKELEY-DB-CACHESIZE . 262144) You won't have that large file: -rw-r----- 1 alex alex 24576 2010-04-21 01:54 __db.001 -rw-r----- 1 alex alex 385024 2010-04-21 01:54 __db.002 -rw-r----- 1 alex alex 335872 2010-04-21 01:54 __db.003 -rw-r----- 1 alex alex 98304 2010-04-21 01:54 __db.004 -rw-r----- 1 alex alex 557056 2010-04-21 01:54 __db.005 -rw-r----- 1 alex alex 253952 2010-04-21 01:54 __db.006 -rw-r----- 1 alex alex 40960 2010-04-21 01:54 %ELEPHANT -rw-r----- 1 alex alex 16384 2010-04-21 01:54 %ELEPHANTDUP -rw-r----- 1 alex alex 16384 2010-04-21 01:54 %ELEPHANTOID -rw-r----- 1 alex alex 10485760 2010-04-21 01:54 log.0000000001 There is also 10 MiB log file. It is default size for BDB. There is no good way to tweak in Elephant, but there is BDB API for this, so it's possible to implement it, if you think it is really needed. ---- _______________________________________________ elephant-devel site list elephant-devel@common-lisp.net http://common-lisp.net/mailman/listinfo/elephant-devel