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* Big speedup (factor > 2.5) in all nix-env operations that do actual

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instantiation, e.g. "nix-env -i" and "nix-env -qas" (but not
  "nix-env -qa").  It turns out that many redundant calls to
  addToStore(path) were made, which reads and hashes the entire path.
  For instance, the bash bootstrap binary in Nixpkgs would be read and
  hashed many times.  As a result nix-env would spend around 92% of
  its time in the function sha256_block (according to callgrind).
  Some simple memoization fixes this.
This commit is contained in:
Eelco Dolstra 2006-03-09 15:09:18 +00:00
parent 6dca5c9099
commit 922697c8b2
2 changed files with 14 additions and 3 deletions
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5
src/libexpr/eval.hh
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@ -11,6 +11,10 @@
typedef map<Path, PathSet> DrvRoots;
typedef map<Path, Hash> DrvHashes;
/* Cache for calls to addToStore(); maps source paths to the store
paths. */
typedef map<Path, Path> SrcToStore;
struct EvalState;
/* Note: using a ATermVector is safe here, since when we call a primop
@ -24,6 +28,7 @@ struct EvalState
ATermMap primOps;
DrvRoots drvRoots;
DrvHashes drvHashes; /* normalised derivation hashes */
SrcToStore srcToStore;
Expr blackHole;
unsigned int nrEvaluated;

8
src/libexpr/primops.cc
View file

@ -165,9 +165,15 @@ static void processBinding(EvalState & state, Expr e, Derivation & drv,
if (isDerivation(srcPath))
throw Error(format("file names are not allowed to end in `%1%'")
% drvExtension);
Path dstPath(addToStore(srcPath));
Path dstPath;
if (state.srcToStore[srcPath] != "")
dstPath = state.srcToStore[srcPath];
else {
dstPath = addToStore(srcPath);
state.srcToStore[srcPath] = dstPath;
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
% srcPath % dstPath);
}
drv.inputSrcs.insert(dstPath);
ss.push_back(dstPath);
}