runc: use buffered writer for archive write

This should speed up both the actual file writing and the hashing.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/runner/runc/run.rs b/src/runner/runc/run.rs
index f12e91f..76c8bc1 100644
--- a/src/runner/runc/run.rs
+++ b/src/runner/runc/run.rs
@@ -1,5 +1,6 @@
 use std::{
 	collections::HashMap,
+	io::BufWriter,
 	path::{Path, PathBuf},
 	process,
 };
@@ -166,8 +167,10 @@ fn collect_one_output(task: &runner::Task, path: &str) -> Result<Option<ArchiveH
 		let file = fs::create(&filename)?;
 		let hasher = ArchiveHasher::new();
 		let writer = TeeWriter::new(file, hasher);
+		let buffered_writer = BufWriter::with_capacity(16 * 1024 * 1024, writer);
 
-		let writer = tar::pack(writer, &source, ["."])?;
+		let buffered_writer = tar::pack(buffered_writer, &source, ["."])?;
+		let writer = buffered_writer.into_inner()?;
 		let (file, hasher) = writer.into_inner();
 		file.sync_all()?;
 		drop(file);