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* True parallel builds. Nix can now run as many build jobs in

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parallel as possible (similar to GNU Make's `-j' switch).  This is
  useful on SMP systems, but it is especially useful for doing builds
  on multiple machines.  The idea is that a large derivation is
  initiated on one master machine, which then distributes
  sub-derivations to any number of slave machines.  This should not
  happen synchronously or in lock-step, so the master must be capable
  of dealing with multiple parallel build jobs.  We now have the
  infrastructure to support this.

  TODO: substitutes are currently broken.
This commit is contained in:
Eelco Dolstra 2004-05-11 18:05:44 +00:00
parent aea436503e
commit c8d3882cdc
12 changed files with 696 additions and 309 deletions
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8
src/libstore/normalise.hh
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@ -8,7 +8,7 @@
derivation, a path containing an equivalent closure expression is
returned. This requires that the derivation is performed, unless a
successor is known. */
Path normaliseStoreExpr(const Path & nePath, PathSet pending = PathSet());
Path normaliseStoreExpr(const Path & nePath);
/* Realise a closure store expression in the file system.
@ -16,15 +16,15 @@ Path normaliseStoreExpr(const Path & nePath, PathSet pending = PathSet());
prevents infinite recursion for paths realised through a substitute
(since when we build the substitute, we would first try to realise
its output paths through substitutes... kaboom!). */
void realiseClosure(const Path & nePath, PathSet pending = PathSet());
void realiseClosure(const Path & nePath);
/* Ensure that a path exists, possibly by instantiating it by
realising a substitute. */
void ensurePath(const Path & path, PathSet pending = PathSet());
void ensurePath(const Path & path);
/* Read a store expression, after ensuring its existence through
ensurePath(). */
StoreExpr storeExprFromPath(const Path & path, PathSet pending = PathSet());
StoreExpr storeExprFromPath(const Path & path);
/* Get the list of root (output) paths of the given store
expression. */