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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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12
src/libexpr/primops.cc
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@ -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));
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
% srcPath % dstPath);
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);
}