Runtime benchmarks CLI and documentation improvements

README.md

@@ -8,4 +8,4 @@ Additional documentation on running and setting up the frontend and backend can
 be found in the `README` files in the `collector` and `site` directories.
 
 Additional documentation on the benchmark programs can be found in the `README`
-file in the `collector/benchmarks` directory.
+file in the `collector/compile-benchmarks` and `collector/runtime-benchmarks` directories.

collector/benchlib/Cargo.toml

@@ -13,6 +13,7 @@ serde_json = "1.0.83"
 log = "0.4.17"
 env_logger = "0.9.0"
 clap = { version = "3.2", features = ["derive"] }
+libc = "0.2"
 
 [target.'cfg(unix)'.dependencies]
 perf-event = "0.4.7"

collector/benchlib/src/benchmark.rs

@@ -1,6 +1,7 @@
 use crate::cli::{parse_cli, Args, BenchmarkArgs};
 use crate::measure::benchmark_function;
 use crate::messages::BenchmarkResult;
+use crate::process::raise_process_priority;
 use log::LevelFilter;
 use std::collections::HashMap;
 
@@ -14,9 +15,16 @@ pub fn benchmark_suite<F: FnOnce(&mut BenchmarkSuite)>(define_func: F) {
     suite.run().expect("Benchmark suite has failed");
 }
 
+/// Type-erased function that performs a benchmark.
+struct BenchmarkWrapper {
+    func: Box<dyn Fn() -> anyhow::Result<BenchmarkResult>>,
+}
+
+type BenchmarkMap = HashMap<&'static str, BenchmarkWrapper>;
+
 #[derive(Default)]
 pub struct BenchmarkSuite {
-    benchmarks: HashMap<&'static str, BenchmarkWrapper>,
+    benchmarks: BenchmarkMap,
 }
 
 impl BenchmarkSuite {
@@ -48,36 +56,47 @@ impl BenchmarkSuite {
     /// Execute the benchmark suite. It will parse CLI arguments and decide what to do based on
     /// them.
     pub fn run(self) -> anyhow::Result<()> {
+        raise_process_priority();
+
         let args = parse_cli()?;
         match args {
             Args::Benchmark(args) => {
-                self.run_benchmark(args)?;
+                run_benchmark(args, self.benchmarks)?;
             }
         }
 
         Ok(())
     }
+}
 
-    fn run_benchmark(self, args: BenchmarkArgs) -> anyhow::Result<()> {
-        let mut items: Vec<_> = self.benchmarks.into_iter().collect();
-        items.sort_unstable_by_key(|item| item.0);
+fn run_benchmark(args: BenchmarkArgs, benchmarks: BenchmarkMap) -> anyhow::Result<()> {
+    let mut items: Vec<(&'static str, BenchmarkWrapper)> = benchmarks
+        .into_iter()
+        .filter(|(name, _)| passes_filter(name, args.exclude.as_deref(), args.include.as_deref()))
+        .collect();
+    items.sort_unstable_by_key(|item| item.0);
 
-        let mut results: Vec<BenchmarkResult> = Vec::with_capacity(items.len());
-        for (name, def) in items {
-            for i in 0..args.iterations {
-                let result = (def.func)()?;
-                log::info!("Benchmark (run {i}) `{}` completed: {:?}", name, result);
-                results.push(result);
-            }
+    let mut results: Vec<BenchmarkResult> = Vec::with_capacity(items.len());
+    for (name, def) in items {
+        for i in 0..args.iterations {
+            let result = (def.func)()?;
+            log::info!("Benchmark (run {i}) `{name}` completed: {result:?}");
+            results.push(result);
         }
-
-        println!("{}", serde_json::to_string(&results)?);
-        Ok(())
     }
+
+    println!("{}", serde_json::to_string(&results)?);
+    Ok(())
 }
 
-struct BenchmarkWrapper {
-    func: Box<dyn Fn() -> anyhow::Result<BenchmarkResult>>,
+/// Tests if the name of the benchmark passes through the include and exclude filter flags.
+fn passes_filter(name: &str, exclude: Option<&str>, include: Option<&str>) -> bool {
+    match (exclude, include) {
+        (Some(exclude), Some(include)) => name.starts_with(include) && !name.starts_with(exclude),
+        (None, Some(include)) => name.starts_with(include),
+        (Some(exclude), None) => !name.starts_with(&exclude),
+        (None, None) => true,
+    }
 }
 
 /// Copied from `iai`, so that we don't have to use unstable features.

collector/benchlib/src/cli.rs

@@ -11,6 +11,14 @@ pub struct BenchmarkArgs {
     /// How many times should each benchmark be repeated.
     #[clap(long, default_value = "5")]
     pub iterations: u32,
+
+    /// Exclude all benchmarks matching a prefix in this comma-separated list
+    #[clap(long)]
+    pub exclude: Option<String>,
+
+    /// Include only benchmarks matching a prefix in this comma-separated list
+    #[clap(long)]
+    pub include: Option<String>,
 }
 
 pub fn parse_cli() -> anyhow::Result<Args> {

collector/benchlib/src/lib.rs

@@ -1,5 +1,6 @@
-//! This library defines an API for performing benchmarks of Rust code. It is tailored for the
-//! use-case of `rustc-perf`, that's why we don't use e.g. `criterion` or `iai`.
+//! This library defines an API for performing benchmarks of Rust code and various other utilities
+//! for measuring and benchmarking. It is tailored for the use-case of `rustc-perf`, that's why we
+//! don't use e.g. `criterion` or `iai`.
 //!
 //! We want to be able to define short benchmarks in code, measure specific perf. counters and most
 //! importantly, consume the benchmark results in a programmatic way.
@@ -16,3 +17,4 @@ pub mod benchmark;
 mod cli;
 pub mod measure;
 pub mod messages;
+pub mod process;

collector/benchlib/src/process.rs

@@ -0,0 +1,16 @@
+#[cfg(unix)]
+pub fn raise_process_priority() {
+    unsafe {
+        // Try to reduce jitter in wall time by increasing our priority to the
+        // maximum
+        for i in (1..21).rev() {
+            let r = libc::setpriority(libc::PRIO_PROCESS as _, libc::getpid() as libc::id_t, -i);
+            if r == 0 {
+                break;
+            }
+        }
+    }
+}
+
+#[cfg(windows)]
+pub fn raise_process_priority() {}

collector/compile-benchmarks/README.md

@@ -1,13 +1,13 @@
-# The Benchmark Suite
+# The Compile-time Benchmark Suite
 
-This file describes the programs in the benchmark suite and explains why they
+This file describes the programs in the compile-time benchmark suite and explains why they
 were included.
 
 The suite changes over time. Sometimes the code for a benchmark is updated, in
 which case a small suffix will be added (starting with "-2", then "-3", and so
 on.)
 
-There are three categories of benchmarks, **Primary**, **Secondary**, and
+There are three categories of compile-time benchmarks, **Primary**, **Secondary**, and
 **Stable**.
 
 ## Primary
@@ -198,7 +198,7 @@ Rust code being written today.
       applies correctly, e.g. `target/release/collector bench_local +nightly
       --id Test --profiles=Check --scenarios=IncrPatched
       --include=$NEW_BENCHMARK`
-  - Add the new entry to `collector/benchmarks/README.md`.
+  - Add the new entry to `collector/compile-benchmarks/README.md`.
   - `git add` the `Cargo.lock` file, if it's not already part of the
     benchmark's committed code.
     - If the benchmark has a `.gitignore` file that contains `Cargo.lock`,
@@ -232,7 +232,7 @@ Rust code being written today.
 - In the first commit just remove the old code.
   - Do this with `git rm -r` on the directory.
 - In the second commit do everything else.
-  - Remove the entry from `collector/benchmarks/README.md`.
+  - Remove the entry from `collector/compile-benchmarks/README.md`.
   - `git grep` for occurrences of the old benchmark name (e.g. in
     `.github/workflows/ci.yml` or `ci/check-*.sh`) and see if anything needs
     changing... usually not.

collector/runtime-benchmarks/README.md

@@ -0,0 +1,9 @@
+# The Runtime Benchmark Suite
+This directory contains various pieces of code for which we measure how fast do they execute
+when they are compiled with a specific version of `rustc`.
+
+The benchmarks are located in crates that are part of the `runtime-benchmarks` workspace. Each crate
+contains a set of benchmarks defined using named closures.
+
+Benchmarks are divided into sub-crates so that some benchmarks can use various versions of dependency
+crates and also so that they are grouped together by a relevant area (e.g. hashmap benchmarks).

collector/runtime-benchmarks/hashmap/src/main.rs

@@ -4,6 +4,7 @@ use benchlib::benchmark::BenchmarkSuite;
 fn main() {
     let mut suite = BenchmarkSuite::new();
 
+    /// Measures how long does it take to insert 10 thousand numbers into a `hashbrown` hashmap.
     suite.register("hashmap-insert-10k", || {
         let mut map =
             hashbrown::HashMap::with_capacity_and_hasher(10000, fxhash::FxBuildHasher::default());

collector/src/bin/collector.rs

@@ -562,10 +562,19 @@ struct BenchRustcOption {
 enum Commands {
     /// Benchmarks the performance of programs generated by a local rustc
     BenchRuntimeLocal {
+        /// The path to the local rustc to measure
         rustc: String,
         /// Identifier to associate benchmark results with
         #[clap(long)]
         id: Option<String>,
+
+        /// Exclude all benchmarks matching a prefix in this comma-separated list
+        #[clap(long)]
+        exclude: Option<String>,
+
+        /// Include only benchmarks matching a prefix in this comma-separated list
+        #[clap(long)]
+        include: Option<String>,
     },
     /// Benchmarks a local rustc
     BenchLocal {
@@ -692,8 +701,19 @@ fn main_result() -> anyhow::Result<i32> {
     let target_triple = format!("{}-unknown-linux-gnu", std::env::consts::ARCH);
 
     match args.command {
-        Commands::BenchRuntimeLocal { rustc, id } => {
-            bench_runtime(&rustc, id.as_deref(), runtime_benchmark_dir)?;
+        Commands::BenchRuntimeLocal {
+            rustc,
+            id,
+            exclude,
+            include,
+        } => {
+            bench_runtime(
+                &rustc,
+                id.as_deref(),
+                exclude,
+                include,
+                runtime_benchmark_dir,
+            )?;
             Ok(0)
         }
         Commands::BenchLocal {

collector/src/bin/rustc-fake.rs

@@ -68,7 +68,7 @@ fn main() {
         let wrapper = args.remove(pos);
         let wrapper = wrapper.to_str().unwrap();
 
-        raise_priority();
+        benchlib::process::raise_process_priority();
 
         // These strings come from `PerfTool::name()`.
         match wrapper {
@@ -490,20 +490,6 @@ fn exec(cmd: &mut Command) -> ! {
     panic!("failed to exec `{}`: {}", cmd_d, error);
 }
 
-#[cfg(unix)]
-fn raise_priority() {
-    unsafe {
-        // Try to reduce jitter in wall time by increasing our priority to the
-        // maximum
-        for i in (1..21).rev() {
-            let r = libc::setpriority(libc::PRIO_PROCESS as _, libc::getpid() as libc::id_t, -i);
-            if r == 0 {
-                break;
-            }
-        }
-    }
-}
-
 #[cfg(unix)]
 fn print_memory() {
     use std::mem;
@@ -555,8 +541,5 @@ fn run_summarize(name: &str, prof_out_dir: &Path, prefix: &str) -> anyhow::Resul
     fs::read_to_string(&json).with_context(|| format!("failed to read {:?}", json))
 }
 
-#[cfg(windows)]
-fn raise_priority() {}
-
 #[cfg(windows)]
 fn print_memory() {}

collector/src/runtime.rs

@@ -10,33 +10,71 @@ struct BenchmarkBinary {
     path: PathBuf,
 }
 
-pub fn bench_runtime(rustc: &str, id: Option<&str>, benchmark_dir: PathBuf) -> anyhow::Result<()> {
+/// Perform a series of runtime benchmarks using the provided `rustc` compiler.
+/// The runtime benchmarks are looked up in `benchmark_dir`, which is expected to be a path
+/// to a Cargo crate. All binaries built by that crate will are expected to be runtime benchmark
+/// suites that leverage `benchlib`.
+pub fn bench_runtime(
+    rustc: &str,
+    id: Option<&str>,
+    exclude: Option<String>,
+    include: Option<String>,
+    benchmark_dir: PathBuf,
+) -> anyhow::Result<()> {
     let toolchain = get_local_toolchain(&[Profile::Opt], rustc, None, None, id, "")?;
     let output = compile_runtime_benchmarks(&toolchain, &benchmark_dir)?;
     let binaries = gather_binaries(&output)?;
 
     for binary in binaries {
         let name = binary.path.file_name().and_then(|s| s.to_str()).unwrap();
 
-        let result = Command::new(&binary.path).arg("benchmark").output()?;
-        if !result.status.success() {
-            anyhow::bail!(
-                "Failed to run runtime benchmark {name}\n{}\n{}",
-                String::from_utf8_lossy(&result.stdout),
-                String::from_utf8_lossy(&result.stderr)
-            );
-        } else {
-            log::info!("Successfully ran runtime benchmark {name}",);
-
-            let data: Vec<BenchmarkResult> = serde_json::from_slice(&result.stdout)?;
-            // TODO: do something with the result
-            println!("{name}: {:?}", data);
-        }
+        let data: Vec<BenchmarkResult> =
+            execute_runtime_binary(&binary.path, name, exclude.as_deref(), include.as_deref())?;
+        // TODO: do something with the result
+        println!("{name}: {:?}", data);
     }
 
     Ok(())
 }
 
+/// Execute a single runtime benchmark suite defined in a binary crate located in
+/// `runtime-benchmarks`. The binary is expected to use benchlib's `BenchmarkSuite` to execute
+/// a set of runtime benchmarks and return a list of `BenchmarkResult`s encoded as JSON.
+fn execute_runtime_binary(
+    binary: &Path,
+    name: &str,
+    exclude: Option<&str>,
+    include: Option<&str>,
+) -> anyhow::Result<Vec<BenchmarkResult>> {
+    // Turn off ASLR
+    let mut command = Command::new("setarch");
+    command.arg(std::env::consts::ARCH);
+    command.arg("-R");
+    command.arg(binary);
+    command.arg("benchmark");
+
+    if let Some(exclude) = exclude {
+        command.args(&["--exclude", exclude]);
+    }
+    if let Some(include) = include {
+        command.args(&["--include", include]);
+    }
+
+    let result = command.output()?;
+
+    if !result.status.success() {
+        return Err(anyhow::anyhow!(
+            "Failed to run runtime benchmark {name}\n{}\n{}",
+            String::from_utf8_lossy(&result.stdout),
+            String::from_utf8_lossy(&result.stderr)
+        ));
+    }
+
+    log::info!("Successfully ran runtime benchmark {name}");
+
+    Ok(serde_json::from_slice(&result.stdout)?)
+}
+
 /// Compiles all runtime benchmarks and returns the stdout output of Cargo.
 fn compile_runtime_benchmarks(toolchain: &LocalToolchain, dir: &Path) -> anyhow::Result<Vec<u8>> {
     let result = Command::new(&toolchain.cargo)