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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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14
src/libexpr/value-to-xml.cc
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@ -34,7 +34,7 @@ static void showAttrs(EvalState & state, bool strict, bool location,
StringSet names;
foreach (Bindings::iterator, i, attrs)
names.insert(i->first);
names.insert(i->name);
foreach (StringSet::iterator, i, names) {
Attr & a(attrs[state.symbols.create(*i)]);
@ -90,16 +90,16 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
Path drvPath;
a = v.attrs->find(state.sDrvPath);
if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->second.value);
if (a->second.value->type == tString)
xmlAttrs["drvPath"] = drvPath = a->second.value->string.s;
if (strict) state.forceValue(*a->value);
if (a->value->type == tString)
xmlAttrs["drvPath"] = drvPath = a->value->string.s;
}
a = v.attrs->find(state.sOutPath);
if (a != v.attrs->end()) {
if (strict) state.forceValue(*a->second.value);
if (a->second.value->type == tString)
xmlAttrs["outPath"] = a->second.value->string.s;
if (strict) state.forceValue(*a->value);
if (a->value->type == tString)
xmlAttrs["outPath"] = a->value->string.s;
}
XMLOpenElement _(doc, "derivation", xmlAttrs);