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2011-02-10 * Don't allocate a big initial GC address space on machines withEelco Dolstra1-11/+24
little RAM. Even if the memory isn't actually used, it can cause problems with the overcommit heuristics in the kernel. So use a VM space of 25% of RAM, up to 384 MB.
2011-02-09 * Don't call GC_expand_hp unless we're actually using the garbageEelco Dolstra1-0/+18
collector.
2010-10-28 * new(UseGC) is inexplicably slower than GC_MALLOC, so prefer theEelco Dolstra1-4/+4
latter.
2010-10-28 * Handle out of memory condition.Eelco Dolstra1-5/+5
2010-10-24 * When allocating an attribute set, reserve enough space for allEelco Dolstra1-11/+5
elements. This prevents the vector from having to resize itself.
2010-10-24 * Keep attribute sets in sorted order to speed up attribute lookups.Eelco Dolstra1-65/+82
* Simplify the representation of attributes in the AST. * Change the behaviour of listToAttrs() in case of duplicate names.
2010-10-24 * Don't create thunks for variable lookups (if possible). ThisEelco Dolstra1-14/+57
significantly reduces the number of values allocated (e.g. from 8.7m to 4.9m for the Bittorrent test).
2010-10-24 * Store attribute sets as a vector instead of a map (i.e. a red-blackEelco Dolstra1-35/+49
tree). This saves a lot of memory. The vector should be sorted so that names can be looked up using binary search, but this is not the case yet. (Surprisingly, looking up attributes using linear search doesn't have a big impact on performance.) Memory consumption for $ nix-instantiate /etc/nixos/nixos/tests -A bittorrent.test --readonly-mode on x86_64-linux with GC enabled is now 185 MiB (compared to 946 MiB on the trunk).
2010-10-23 * Fix compiling without Boehm.Eelco Dolstra1-10/+8
* Fix the stats.
2010-10-23 * Optimise string constants by putting them in the symbol table.Eelco Dolstra1-1/+9
2010-10-23 * Make Value smaller by not storing redundant PrimOp info.Eelco Dolstra1-16/+21
* Clear pointers in Values after overwriting them to make sure that no objects are kept alive unnecessarily.
2010-10-23 * Remove allocValues().Eelco Dolstra1-17/+5
2010-10-22 * In environments, store pointers to values rather than values. ThisEelco Dolstra1-26/+24
improves GC effectiveness a bit more (because a live value doesn't keep other values in the environment plus the parent environments alive), and removes the need for copy nodes.
2010-10-22 * Store Value nodes outside of attribute sets. I.e., Attr now storesEelco Dolstra1-41/+56
a pointer to a Value, rather than the Value directly. This improves the effectiveness of garbage collection a lot: if the Value is stored inside the set directly, then any live pointer to the Value causes all other attributes in the set to be live as well.
2010-10-22 * Make building against the Boehm GC a configure option.Eelco Dolstra1-5/+18
2010-10-20 * Keep some more stats.Eelco Dolstra1-0/+9
2010-10-20 * Use the Boehm garbage collector to reclaim unused memory in the NixEelco Dolstra1-9/+14
expression evaluator.
2010-08-27 * Oops - "null" was displayed as "true".Eelco Dolstra1-1/+1
2010-08-02 * Optimisation in the // operator: if one of the sets is empty, returnEelco Dolstra1-6/+8
the other set.
2010-06-10 * builtins.toXML: propagate the string context. This is a regressionEelco Dolstra1-5/+9
from the old ATerm-based evaluator.
2010-06-02 (no commit message)Eelco Dolstra1-0/+1
2010-05-18 * The << operator on values should be const.Eelco Dolstra1-1/+1
2010-05-15 * Restore the __overrides feature that was lost somewhere in theEelco Dolstra1-2/+19
fast-eval branch.
2010-05-12 * Print attributes in sorted order.Eelco Dolstra1-2/+7
2010-05-07 * Store position info for inherited attributes.Eelco Dolstra1-10/+12
2010-05-07 * Keep track of the source positions of attributes.Eelco Dolstra1-22/+37
2010-05-06 * Store attribute positions in the AST and report duplicate attributeEelco Dolstra1-13/+3
errors with position info. * For all positions, use the position of the first character of the first token, rather than the last character of the first token plus one.
2010-04-22 * Simplify the implementation of `with'. This gives a 7% speedup inEelco Dolstra1-25/+9
evaluating the NixOS system configuration.
2010-04-22 * String equality tests should take the context into account. All theEelco Dolstra1-3/+11
evaluation test cases now succeed.
2010-04-21 * Fixed builtins.genericClosure.Eelco Dolstra1-3/+7
2010-04-21 * Store user environment manifests as a Nix expression inEelco Dolstra1-2/+9
$out/manifest.nix rather than as an ATerm. (Hm, I thought I committed this two days ago...)
2010-04-16 * Updated some more primops.Eelco Dolstra1-10/+13
2010-04-16 * Improve sharing a bit.Eelco Dolstra1-4/+7
2010-04-16 * Remove some redundant tests.Eelco Dolstra1-3/+3
2010-04-16 * In an nested `with' where the inner with is a variable (`with ...;Eelco Dolstra1-1/+7
with someVar; ...'), the contents of the variable would be clobbered. (The attributes in the outer `with' were added to the variable.)
2010-04-15 * Store lists as lists of pointers to values rather than as lists ofEelco Dolstra1-16/+17
values. This improves sharing and gives another speed up. Evaluation of the NixOS system attribute is now almost 7 times faster than the old evaluator.
2010-04-14 * Better stats.Eelco Dolstra1-4/+13
2010-04-14 * Implemented inherit.Eelco Dolstra1-18/+12
2010-04-14 * Fix builtins.Eelco Dolstra1-11/+9
2010-04-14 * Refactoring: move variable uses to a separate class.Eelco Dolstra1-29/+13
2010-04-14 * Implemented withs.Eelco Dolstra1-14/+23
2010-04-14 * After parsing, compute level/displacement pairs for each variableEelco Dolstra1-36/+55
use site, allowing environments to be stores as vectors of values rather than maps. This should speed up evaluation and reduce the number of allocations.
2010-04-14 * Change the semantics of "with" so that inner "withs" takeEelco Dolstra1-23/+2
precedence, i.e. `with {x=1;}; with {x=2;}; x' evaluates to 2'. This has a simpler implementation and seems more natural. There doesn't seem to be any code in Nixpkgs or NixOS that relies on the old behaviour.
2010-04-13 * Use std::tr1::unordered_set instead of std::set for the symbolEelco Dolstra1-0/+1
table. This gives a 10% speed increase on `nix-instantiate /etc/nixos/nixos -A system --readonly-mode'.
2010-04-13 * Evaluate lets directly (i.e. without desugaring to `rec { attrs...;Eelco Dolstra1-0/+25
<let-body> = e; }.<let-body>). This prevents the unnecessary allocation of an attribute set.
2010-04-13 * Use a symbol table to represent identifiers and attribute namesEelco Dolstra1-19/+26
efficiently. The symbol table ensures that there is only one copy of each symbol, thus allowing symbols to be compared efficiently using a pointer equality test.
2010-04-12 * Finished the ATerm-less parser.Eelco Dolstra1-3/+30
2010-04-12 * Indented strings.Eelco Dolstra1-0/+6
2010-04-12 * More missing constructs.Eelco Dolstra1-69/+59
2010-04-12 * Don't use ATerms for the abstract syntax trees anymore. NotEelco Dolstra1-223/+244
finished yet.