src/ci/pgo.sh

   1 #!/bin/bash
   2
   3 set -euxo pipefail
   4
   5 rm -rf /tmp/rustc-pgo
   6
   7 python3 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \
   8     --stage 2 library/std \
   9     --rust-profile-generate=/tmp/rustc-pgo \
  10     --llvm-profile-generate
  11
  12 # Profile libcore compilation in opt-level=0 and opt-level=3
  13 RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
  14     --crate-type=lib ../library/core/src/lib.rs
  15 RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
  16     --crate-type=lib -Copt-level=3 ../library/core/src/lib.rs
  17
  18 cp -r /tmp/rustc-perf ./
  19 chown -R $(whoami): ./rustc-perf
  20 cd rustc-perf
  21
  22 # Build the collector ahead of time, which is needed to make sure the rustc-fake
  23 # binary used by the collector is present.
  24 RUSTC=/checkout/obj/build/$PGO_HOST/stage0/bin/rustc \
  25 RUSTC_BOOTSTRAP=1 \
  26 /checkout/obj/build/$PGO_HOST/stage0/bin/cargo build -p collector
  27
  28 # benchmark using profile_local with eprintln, which essentially just means
  29 # don't actually benchmark -- just make sure we run rustc a bunch of times.
  30 RUST_LOG=collector=debug \
  31 RUSTC=/checkout/obj/build/$PGO_HOST/stage0/bin/rustc \
  32 RUSTC_BOOTSTRAP=1 \
  33 /checkout/obj/build/$PGO_HOST/stage0/bin/cargo run -p collector --bin collector -- \
  34         profile_local \
  35         eprintln \
  36         /checkout/obj/build/$PGO_HOST/stage2/bin/rustc \
  37         Test \
  38         --builds Check,Debug,Opt \
  39         --cargo /checkout/obj/build/$PGO_HOST/stage0/bin/cargo \
  40         --runs All \
  41         --include externs,ctfe-stress-4,inflate,cargo,token-stream-stress,match-stress-enum
  42
  43 cd /checkout/obj
  44
  45 # Merge the profile data we gathered
  46 ./build/$PGO_HOST/llvm/bin/llvm-profdata \
  47     merge -o /tmp/rustc-pgo.profdata /tmp/rustc-pgo
  48
  49 # Merge the profile data we gathered for LLVM
  50 # Note that this uses the profdata from the clang we used to build LLVM,
  51 # which likely has a different version than our in-tree clang.
  52 /rustroot/bin/llvm-profdata \
  53     merge -o /tmp/llvm-pgo.profdata ./build/$PGO_HOST/llvm/build/profiles
  54
  55 # Rustbuild currently doesn't support rebuilding LLVM when PGO options
  56 # change (or any other llvm-related options); so just clear out the relevant
  57 # directories ourselves.
  58 rm -r ./build/$PGO_HOST/llvm ./build/$PGO_HOST/lld
  59
  60 # This produces the actual final set of artifacts.
  61 $@ \
  62     --rust-profile-use=/tmp/rustc-pgo.profdata \
  63     --llvm-profile-use=/tmp/llvm-pgo.profdata