diff options
| author | Eelco Dolstra <e.dolstra@tudelft.nl> | 2006-11-18T18·56+0000 |
|---|---|---|
| committer | Eelco Dolstra <e.dolstra@tudelft.nl> | 2006-11-18T18·56+0000 |
| commit | 0541ddc7e33c35a35efe85b6d6f603efb5bac8c8 (patch) | |
| tree | 55d80aab366bdfe95cfd9a70f9ced5f03d955d6e | |
| parent | 471749ca7eb594660488954d23391f5329d638a4 (diff) | |
* Turn off synchronisation between C and C++ I/O functions. This
gives a huge speedup in operations that read or write from standard input/output. (So libstdc++'s I/O isn't that bad, you just have to call std::ios::sync_with_stdio(false).) For instance, `nix-store --register-substitutes' went from 1.4 seconds to 0.1 seconds on a certain input. Another victory for Valgrind.
| -rw-r--r-- | src/libmain/shared.cc | 2 | ||||
| -rw-r--r-- | src/nix-store/main.cc | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc index 00e197499e..d135691a1a 100644 --- a/src/libmain/shared.cc +++ b/src/libmain/shared.cc @@ -225,6 +225,8 @@ int main(int argc, char * * argv) std::cerr.rdbuf()->pubsetbuf(buf, sizeof(buf)); #endif + std::ios::sync_with_stdio(false); + try { try { initAndRun(argc, argv); diff --git a/src/nix-store/main.cc b/src/nix-store/main.cc index 5a87806d03..8c2ff22799 100644 --- a/src/nix-store/main.cc +++ b/src/nix-store/main.cc @@ -632,7 +632,7 @@ static void opDump(Strings opFlags, Strings opArgs) } -/* A source that read restore intput to stdin. */ +/* A source that reads restore input from stdin. */ struct StdinSource : RestoreSource { virtual void operator () (unsigned char * data, unsigned int len) |