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Eelco Dolstra e82767910c Add some basic profiling support to the evaluator 
Setting the environment variable NIX_COUNT_CALLS to 1 enables some
basic profiling in the evaluator.  It will count calls to functions
and primops as well as evaluations of attributes.

For example, to see where evaluation of a NixOS configuration spends
its time:

$ NIX_SHOW_STATS=1 NIX_COUNT_CALLS=1 ./src/nix-instantiate/nix-instantiate '<nixos>' -A system --readonly-mode
...
calls to 39 primops:
    239532 head
    233962 tail
    191252 hasAttr
...
calls to 1595 functions:
    224157 `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/lists.nix:17:19'
    221767 `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/lists.nix:17:14'
    221767 `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/lists.nix:17:10'
...
evaluations of 7088 attributes:
    167377 undefined position
    132459 `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/attrsets.nix:119:41'
     47322 `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/pkgs/lib/attrsets.nix:13:21'
...
2012-08-12 23:29:28 -04:00
..
bin2c * Sync with the trunk. 2010-04-20 09:20:29 +00:00
boost * Install some headers in the right location. 2009-03-05 14:57:50 +00:00
bsdiff-4.3 Drop the externals directory 2012-03-18 23:54:57 +01:00
libexpr Add some basic profiling support to the evaluator 2012-08-12 23:29:28 -04:00
libmain Use "#pragma once" to prevent repeated header file inclusion 2012-07-18 14:59:03 -04:00
libstore Don't warn about maximum link count exceeded on 0-byte files 2012-08-07 16:22:54 -04:00
libutil Add some basic profiling support to the evaluator 2012-08-12 23:29:28 -04:00
nix-env Use "#pragma once" to prevent repeated header file inclusion 2012-07-18 14:59:03 -04:00
nix-hash * Move parseHash16or32 into libutil, and use in nix-hash. 2011-12-02 11:47:06 +00:00
nix-instantiate nix-instantiate: default to "default.nix" if no arguments are given 2012-04-17 17:19:43 +02:00
nix-log2xml * Emit warning='1' or error='1' attributes for lines marked as 2010-03-05 12:54:58 +00:00
nix-setuid-helper * Drop the dependency on the ATerm library. 2010-04-19 14:51:58 +00:00
nix-store Drop the block count in the garbage collector 2012-08-01 22:34:46 -04:00
nix-worker Drop the block count in the garbage collector 2012-08-01 22:34:46 -04:00
Makefile.am * Drop the dependency on the ATerm library. 2010-04-19 14:51:58 +00:00