Eelco Dolstra 4ccd48ce24 Add a "filter" primop ... Evaluation of a NixOS configuration spends quite a lot of time in the "filter" function in Nixpkgs. As implemented in Nixpkgs, this is a O(n^2) operation, so it's a good candidate for providing a more efficient (i.e. primop) implementation. Using it gives a ~10% speed increase and a significant reduction in the number of evaluations. Statistics before (on a NixOS system config): time elapsed: 1.3258 size of a value: 24 environments allocated: 1980939 (50127080 bytes) list elements: 14679308 (117434464 bytes) list concatenations: 50828 values allocated: 2098938 (50374512 bytes) attribute sets allocated: 392040 right-biased unions: 186334 values copied in right-biased unions: 591137 symbols in symbol table: 18271 number of thunks: 1645752 number of thunks avoided: 1921196 number of attr lookups: 430798 number of primop calls: 838807 number of function calls: 1930107 Statistics after: time elapsed: 1.17982 size of a value: 24 environments allocated: 1543334 (39624560 bytes) list elements: 9612638 (76901104 bytes) list concatenations: 37434 values allocated: 1854933 (44518392 bytes) attribute sets allocated: 392040 right-biased unions: 186334 values copied in right-biased unions: 591137 symbols in symbol table: 18272 number of thunks: 1392467 number of thunks avoided: 1507311 number of attr lookups: 430801 number of primop calls: 691600 number of function calls: 1492502		2012-08-13 00:28:08 -04:00
..
attr-path.cc	Fix compilation on FreeBSD	2012-03-05 22:04:40 +01:00
attr-path.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
common-opts.cc	Fix error message	2012-02-09 18:56:48 +01:00
common-opts.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
eval-inline.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
eval.cc	Add a "filter" primop	2012-08-13 00:28:08 -04:00
eval.hh	Add some more evaluations stats	2012-08-12 23:41:48 -04:00
get-drvs.cc	* Inline some functions and get rid of the indirection through	2012-02-04 13:50:25 +00:00
get-drvs.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
lexer.l	* Add a Nix expression search path feature. Paths between angle	2011-08-06 16:05:24 +00:00
Makefile.am	* Inline some functions and get rid of the indirection through	2012-02-04 13:50:25 +00:00
names.cc	* Export the nix-env derivation name parsing and version comparison	2008-07-01 10:10:32 +00:00
names.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
nix.sdf	First attempt to update Nix SDF grammar to match the actual bison grammar	2008-06-04 14:36:46 +00:00
nixexpr.cc	* Allow a default value in attribute selection by writing	2011-07-13 12:19:57 +00:00
nixexpr.hh	Add some basic profiling support to the evaluator	2012-08-12 23:29:28 -04:00
parser.y	Use Bison 2.5	2012-04-13 14:28:26 +02:00
primops.cc	Add a "filter" primop	2012-08-13 00:28:08 -04:00
symbol-table.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
value-to-xml.cc	Fix compilation on FreeBSD	2012-03-05 22:04:40 +01:00
value-to-xml.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00
value.hh	Use "#pragma once" to prevent repeated header file inclusion	2012-07-18 14:59:03 -04:00