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* Store attribute sets as a vector instead of a map (i.e. a red-black

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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).
This commit is contained in:
Eelco Dolstra 2010-10-24 00:41:29 +00:00
parent a247d20604
commit 0b305c534f
7 changed files with 129 additions and 90 deletions
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34
src/libexpr/get-drvs.cc
View file

@ -10,7 +10,7 @@ string DrvInfo::queryDrvPath(EvalState & state) const
if (drvPath == "" && attrs) {
Bindings::iterator i = attrs->find(state.sDrvPath);
PathSet context;
(string &) drvPath = i != attrs->end() ? state.coerceToPath(*i->second.value, context) : "";
(string &) drvPath = i != attrs->end() ? state.coerceToPath(*i->value, context) : "";
}
return drvPath;
}
@ -21,7 +21,7 @@ string DrvInfo::queryOutPath(EvalState & state) const
if (outPath == "" && attrs) {
Bindings::iterator i = attrs->find(state.sOutPath);
PathSet context;
(string &) outPath = i != attrs->end() ? state.coerceToPath(*i->second.value, context) : "";
(string &) outPath = i != attrs->end() ? state.coerceToPath(*i->value, context) : "";
}
return outPath;
}
@ -36,23 +36,23 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
Bindings::iterator a = attrs->find(state.sMeta);
if (a == attrs->end()) return meta; /* fine, empty meta information */
state.forceAttrs(*a->second.value);
state.forceAttrs(*a->value);
foreach (Bindings::iterator, i, *a->second.value->attrs) {
foreach (Bindings::iterator, i, *a->value->attrs) {
MetaValue value;
state.forceValue(*i->second.value);
if (i->second.value->type == tString) {
state.forceValue(*i->value);
if (i->value->type == tString) {
value.type = MetaValue::tpString;
value.stringValue = i->second.value->string.s;
} else if (i->second.value->type == tInt) {
value.stringValue = i->value->string.s;
} else if (i->value->type == tInt) {
value.type = MetaValue::tpInt;
value.intValue = i->second.value->integer;
} else if (i->second.value->type == tList) {
value.intValue = i->value->integer;
} else if (i->value->type == tList) {
value.type = MetaValue::tpStrings;
for (unsigned int j = 0; j < i->second.value->list.length; ++j)
value.stringValues.push_back(state.forceStringNoCtx(*i->second.value->list.elems[j]));
for (unsigned int j = 0; j < i->value->list.length; ++j)
value.stringValues.push_back(state.forceStringNoCtx(*i->value->list.elems[j]));
} else continue;
((MetaInfo &) meta)[i->first] = value;
((MetaInfo &) meta)[i->name] = value;
}
return meta;
@ -99,13 +99,13 @@ static bool getDerivation(EvalState & state, Value & v,
Bindings::iterator i = v.attrs->find(state.sName);
/* !!! We really would like to have a decent back trace here. */
if (i == v.attrs->end()) throw TypeError("derivation name missing");
drv.name = state.forceStringNoCtx(*i->second.value);
drv.name = state.forceStringNoCtx(*i->value);
Bindings::iterator i2 = v.attrs->find(state.sSystem);
if (i2 == v.attrs->end())
drv.system = "unknown";
else
drv.system = state.forceStringNoCtx(*i2->second.value);
drv.system = state.forceStringNoCtx(*i2->value);
drv.attrs = v.attrs;
@ -163,7 +163,7 @@ static void getDerivations(EvalState & state, Value & vIn,
typedef std::map<string, Symbol> SortedSymbols;
SortedSymbols attrs;
foreach (Bindings::iterator, i, *v.attrs)
attrs.insert(std::pair<string, Symbol>(i->first, i->first));
attrs.insert(std::pair<string, Symbol>(i->name, i->name));
foreach (SortedSymbols::iterator, i, attrs) {
startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % i->first);
@ -178,7 +178,7 @@ static void getDerivations(EvalState & state, Value & vIn,
attribute. */
if (v2.type == tAttrs) {
Bindings::iterator j = v2.attrs->find(state.symbols.create("recurseForDerivations"));
if (j != v2.attrs->end() && state.forceBool(*j->second.value))
if (j != v2.attrs->end() && state.forceBool(*j->value))
getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done);
}
}