src/ci/pgo.sh

   1 #!/bin/bash
   2
   3 set -euxo pipefail
   4
   5 export RUSTC_BOOTSTRAP=1
   6
   7 rm -rf /tmp/rustc-pgo
   8
   9 python2.7 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \
  10     --stage 2 library/std --rust-profile-generate=/tmp/rustc-pgo
  11
  12 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
  13     --crate-type=lib ../library/core/src/lib.rs
  14
  15 # Download and build a single-file stress test benchmark on perf.rust-lang.org.
  16 function pgo_perf_benchmark {
  17     local PERF=e095f5021bf01cf3800f50b3a9f14a9683eb3e4e
  18     local github_prefix=https://raw.githubusercontent.com/rust-lang/rustc-perf/$PERF
  19     local name=$1
  20     curl -o /tmp/$name.rs $github_prefix/collector/benchmarks/$name/src/lib.rs
  21     ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 --crate-type=lib /tmp/$name.rs
  22 }
  23
  24 pgo_perf_benchmark externs
  25 pgo_perf_benchmark ctfe-stress-4
  26
  27 cp -pri ../src/tools/cargo /tmp/cargo
  28
  29 # The Cargo repository does not have a Cargo.lock in it, as it relies on the
  30 # lockfile already present in the rust-lang/rust monorepo. This decision breaks
  31 # down when Cargo is built outside the monorepo though (like in this case),
  32 # resulting in a build without any dependency locking.
  33 #
  34 # To ensure Cargo is built with locked dependencies even during PGO profiling
  35 # the following command copies the monorepo's lockfile into the Cargo temporary
  36 # directory. Cargo will *not* keep that lockfile intact, as it will remove all
  37 # the dependencies Cargo itself doesn't rely on. Still, it will prevent
  38 # building Cargo with arbitrary dependency versions.
  39 #
  40 # See #81378 for the bug that prompted adding this.
  41 cp -p ../Cargo.lock /tmp/cargo
  42
  43 # Build cargo (with some flags)
  44 function pgo_cargo {
  45     RUSTC=./build/$PGO_HOST/stage2/bin/rustc \
  46         ./build/$PGO_HOST/stage0/bin/cargo $@ \
  47         --manifest-path /tmp/cargo/Cargo.toml
  48 }
  49
  50 # Build a couple different variants of Cargo
  51 CARGO_INCREMENTAL=1 pgo_cargo check
  52 echo 'pub fn barbarbar() {}' >> /tmp/cargo/src/cargo/lib.rs
  53 CARGO_INCREMENTAL=1 pgo_cargo check
  54 touch /tmp/cargo/src/cargo/lib.rs
  55 CARGO_INCREMENTAL=1 pgo_cargo check
  56 pgo_cargo build --release
  57
  58 # Merge the profile data we gathered
  59 ./build/$PGO_HOST/llvm/bin/llvm-profdata \
  60     merge -o /tmp/rustc-pgo.profdata /tmp/rustc-pgo
  61
  62 # This produces the actual final set of artifacts.
  63 $@ --rust-profile-use=/tmp/rustc-pgo.profdata