fix: use disk-backed tempdir for tool configs to avoid filling tmpfs

Author: bryantbiggs

.gitignore

@@ -23,6 +23,7 @@ docs/superpowers/
 bench/results/*/
 bench/.bench-run.pid
 bench/.bench-run.log
+bench/.tmp/
 .superpowers/
 .playwright-mcp/
 

bench/terraform/aws/main.tf

@@ -27,7 +27,7 @@ provider "aws" {
 
 locals {
   instance_type   = "c6in.4xlarge"
-  ebs_volume_size = 100
+  ebs_volume_size = 256
   ebs_iops        = 6000
   ebs_throughput  = 400 # MB/s
   my_ip           = "${trimspace(data.http.my_ip.response_body)}/32"

xtask/src/bench/remote.rs

@@ -180,6 +180,11 @@ cp target/release/ocync ~/.cargo/bin/ocync
 cp target/release/bench-proxy ~/.cargo/bin/bench-proxy
 
 echo '[3/4] Starting benchmarks...'
+# Use real disk for temp files, not tmpfs (/tmp is RAM-backed on AL2023
+# and fills up with multi-GB blob staging data).
+export TMPDIR=$HOME/ocync/bench/.tmp
+rm -rf "$TMPDIR"
+mkdir -p "$TMPDIR"
 {registry_env}
 
 # Launch detached with output to log file.

xtask/src/bench/runner.rs

@@ -181,12 +181,19 @@ pub(crate) async fn run_tool(
     let stderr_pipe = child.stderr.take().expect("stderr piped");
 
     let tool_name = tool.to_string();
+    let tool_name_err = tool_name.clone();
+    // ocync --json writes structured JSON to stdout for the reporting
+    // pipeline; don't echo it to the operator. Other tools write
+    // human-readable progress to stdout, so stream those.
+    let echo_stdout = tool != Tool::Ocync;
     let stdout_handle = tokio::spawn(async move {
         let mut buf = String::new();
         let mut reader = BufReader::new(stdout_pipe);
         let mut line = String::new();
         while reader.read_line(&mut line).await.unwrap_or(0) > 0 {
-            eprint!("  [{tool_name}] {line}");
+            if echo_stdout {
+                eprint!("  [{tool_name}] {line}");
+            }
             buf.push_str(&line);
             line.clear();
         }
@@ -199,7 +206,7 @@ pub(crate) async fn run_tool(
         let mut line = String::new();
         while reader.read_line(&mut line).await.unwrap_or(0) > 0 {
             if !is_gnu_time_line(&line) {
-                eprint!("  {line}");
+                eprint!("  [{tool_name_err}] {line}");
             }
             buf.push_str(&line);
             line.clear();