From e82767910c649f160d6701e47f606f3b8dde4b29 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Sun, 12 Aug 2012 23:29:28 -0400 Subject: 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 '' -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' ... --- src/libexpr/nixexpr.hh | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/libexpr/nixexpr.hh') diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh index 4c1a0bb2d5fb..bc6c3287c79d 100644 --- a/src/libexpr/nixexpr.hh +++ b/src/libexpr/nixexpr.hh @@ -27,6 +27,15 @@ struct Pos Pos() : line(0), column(0) { }; Pos(const string & file, unsigned int line, unsigned int column) : file(file), line(line), column(column) { }; + bool operator < (const Pos & p2) const + { + int d = file.compare(p2.file); + if (d < 0) return true; + if (d > 0) return false; + if (line < p2.line) return true; + if (line > p2.line) return false; + return column < p2.column; + } }; extern Pos noPos; -- cgit 1.4.1