Merge pull request #801 from Mark-Simulacrum/build-with-cargo-opts

Include .cargo in Dockerfile build

Author: Mark-Simulacrum

Dockerfile

@@ -29,6 +29,7 @@ ENV PATH=/root/.cargo/bin:$PATH
 # and doing a full build with it.
 WORKDIR /source
 COPY Cargo.lock Cargo.toml /source/
+COPY .cargo /source/.cargo
 RUN mkdir -p /source/src && \
     echo "fn main() {}" > /source/src/main.rs && \
     echo "fn main() {}" > /source/build.rs

src/runner/worker.rs

@@ -160,6 +160,9 @@ impl<'a> Worker<'a> {
             let krate = if let Some(next) = (self.next_crate)()? {
                 next
             } else {
+                // Backoff from calling the server again, to reduce load when we're spinning until
+                // the next experiment is ready.
+                std::thread::sleep(Duration::from_secs(rand::random_range(3..10)));
                 // We're done if no more crates left.
                 return Ok(());
             };