Function runPostProcess

scripts/profiler/main.ts:453–473

Runs a post-processing shell pipeline; returns whether it succeeded.

(pipeline: string)

/** Runs a post-processing shell pipeline; returns whether it succeeded. */
function runPostProcess(pipeline: string): boolean {
  // The pipelines write their data to files themselves, so only stderr —
  // which carries the diagnosis on failure — is captured. perf can emit
  // megabytes of non-fatal stderr noise even on success, so the buffer is
  // sized well above the default to not kill a healthy pipeline.
  const result = spawnSync("bash", ["-c", pipeline], {
    stdio: ["ignore", "ignore", "pipe"],
    encoding: "utf-8",
    maxBuffer: 16 * 1024 * 1024,
  });

  if (result.status !== 0) {
    logWarning(
      `post-processing failed (exit ${String(result.status)}): ${pipeline}\n` +
        `    ${stderrTail(result.stderr)}`,
    );
    return false;
  }

  return true;
}

/**
 * The last few stderr lines of a failed command, as an indented block for a