* Use std::tr1::unordered_set instead of std::set for the symbol
table. This gives a 10% speed increase on `nix-instantiate /etc/nixos/nixos -A system --readonly-mode'.
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2 changed files with 8 additions and 1 deletions
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@ -1058,6 +1058,7 @@ void EvalState::printStats()
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printMsg(v, format(" stack space per eval() level: %1% bytes") % ((&x - deepestStack) / (float) maxRecursionDepth));
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printMsg(v, format(" values allocated: %1%") % nrValues);
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printMsg(v, format(" environments allocated: %1%") % nrEnvs);
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printMsg(v, format(" symbols in symbol table: %1%") % symbols.size());
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}
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@ -2,6 +2,7 @@
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#define __SYMBOL_TABLE_H
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#include <map>
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#include <tr1/unordered_set>
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#include "types.hh"
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@ -59,7 +60,7 @@ inline std::ostream & operator << (std::ostream & str, const Symbol & sym)
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class SymbolTable
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{
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private:
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typedef std::set<string> Symbols;
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typedef std::tr1::unordered_set<string> Symbols;
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Symbols symbols;
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public:
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@ -68,6 +69,11 @@ public:
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std::pair<Symbols::iterator, bool> res = symbols.insert(s);
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return Symbol(&*res.first);
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}
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unsigned int size() const
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{
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return symbols.size();
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}
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};
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}
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