Perf notes

[Simon Peyton Jones]

Despite a recent

git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git

refs/notes/perf:refs/notes/ci/perf
I'm getting lots of perf regressions in HEAD. For example

=====> T9203(normal) 1 of 1 [0, 0, 0]

]0;T9203(normal) 1 of 1 [0, 0, 0]cd "T9203.run" &&  "/home/simonpj/code/HEAD-3/inplace/bin/ghc-stage2" -o T9203 T9203.hs -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output  -O2<

cd "T9203.run" && ./T9203  +RTS -V0 -tT9203.stats --machine-readable -RTS  <

runtime/bytes allocated increased from x86_64-linux-deb9 baseline @ HEAD~28:

    Expected    T9203 (normal) runtime/bytes allocated: 56046952.0 +/-5%

    Lower bound T9203 (normal) runtime/bytes allocated:   53244604

    Upper bound T9203 (normal) runtime/bytes allocated:   58849300

    Actual      T9203 (normal) runtime/bytes allocated:  108464536

    Deviation   T9203 (normal) runtime/bytes allocated:       93.5 %

*** unexpected stat test failure for T9203(normal)



Performance Metrics (test environment: local):



T9203(normal)             runtime/bytes allocated                     108464536.000

                          (baseline @ HEAD~28)                         56046952.000  [increased, 93.5%]
What am I doing wrong?
Simon
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