This could previously crash lix:
Before:
$ nix eval -E '{type="derivation"; drvPath="";}'
nix: lix/libutil/file-system.cc:45: Path nix::canonPath(PathView, bool): Assertion `path != ""' failed.
Aborted (core dumped)
After:
$ nix eval -E '{type="derivation"; drvPath="";}'
error:
… while evaluating the drvPath of a derivation
at «string»:1:21:
1| {type="derivation"; drvPath="";}
| ^
error: path '' is not in the Nix store
Fixes#536
Change-Id: I406dc9e58047be8f263cf2e4bc3ed5da75a46602
This is to some extent a simple transliteration of bench.sh, but also
adds some additional features:
- the ability to select which benchmarks to run, instead of having to
run all at once (via --cases option)
- help text (--help), and argument parsing
- ability to profile instruction counts (via --mode icount).
Instruction count is a stable metric, that correlates to the execution
time, but is less affected by the environment (like other heavy programs
running, or the system hardware).
Other projects (most notably rustc) use instruction count as a primary target metric.
Change-Id: I791cac499e64983efb8bcd4ea1faef13ded09ee6
