Add show-adv-stats flag which shows per compiler hits/misses

[robertmaynard]

Adds the -show-adv-stats command line option to sccache which will show more details on the compiler hits/misses for each language and compiler.

Example of using sccache with clang, g++, and nvcc with C, C++, and CUDA sources:

/home/rmaynard/Work/sccache/target/debug/sccache --show-adv-stats
Compile requests                     18
Compile requests executed            18
Cache hits                            9
Cache hits (c [clang])                1
Cache hits (c [gcc])                  1
Cache hits (c [nvcc])                 1
Cache hits (c++ [clang])              1
Cache hits (c++ [gcc])                2
Cache hits (c++ [nvcc])               1
Cache hits (cuda [clang])             1
Cache hits (cuda [nvcc])              1
Cache misses                          9
Cache misses (c [clang])              1
Cache misses (c [gcc])                1
Cache misses (c [nvcc])               1
Cache misses (c++ [clang])            1
Cache misses (c++ [gcc])              2
Cache misses (c++ [nvcc])             1
Cache misses (cuda [clang])           1
Cache misses (cuda [nvcc])            1
Cache timeouts                        0
Cache read errors                     0
Forced recaches                       0
Cache write errors                    0
Compilation failures                  0
Cache errors                          0
Non-cacheable compilations            0
Non-cacheable calls                   0
Non-compilation calls                 0
Unsupported compiler calls            0
Average cache write               0.000 s
Average compiler                  0.101 s
Average cache read hit            0.000 s
Failed distributed compilations       0
Cache location                  Local disk: "/home/rmaynard/.cache/sccache"
Version (client)                0.5.4
Cache size                            5 KiB
Max cache size                       32 GiB

[codecov-commenter]

Codecov Report

Attention: 55 lines in your changes are missing coverage. Please review.

Comparison is base (b28d686) 29.68% compared to head (fc7cf62) 29.67%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1904      +/-   ##
==========================================
- Coverage   29.68%   29.67%   -0.02%     
==========================================
  Files          50       50              
  Lines       17967    18024      +57     
  Branches     8662     8710      +48     
==========================================
+ Hits         5334     5348      +14     
- Misses       7469     7500      +31     
- Partials     5164     5176      +12     

Files	Coverage Δ
src/commands.rs	17.52% <25.00%> (ø)
tests/sccache_cargo.rs	34.39% <0.00%> (-0.23%)	⬇️
src/cmdline.rs	15.97% <0.00%> (-0.58%)	⬇️
src/compiler/compiler.rs	37.32% <50.00%> (+0.17%)	⬆️
tests/system.rs	22.33% <21.73%> (-0.03%)	⬇️
src/server.rs	31.18% <17.39%> (-1.13%)	⬇️

... and 8 files with indirect coverage changes

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[sylvestre]

LGTM

Maybe you could test this into some integration-tests ?

[robertmaynard]

LGTM

Maybe you could test this into some integration-tests ?

I will look into extending tests/system.rs to validate the advanced stats. IIRC the primary sticking point was that I was hesitant to re-implement the CompilerKind mapping of compiler names to nice strings. That will be needed to verify the hits/misses are in the correct bucket.

Thinking about it more, the tests/system.rs has a subset of compilers so the mapping should be easy to implement

[robertmaynard]

@sylvestre Extended some of the tests/system.rs to verify the advanced keys. Happy to iterate a better design / test for this if needed

[sylvestre]

thanks :)