diff --git a/tui/index.ts b/tui/index.ts
index 2ced3f0..5a943b7 100644
--- a/tui/index.ts
+++ b/tui/index.ts
@@ -841,9 +841,22 @@ async function checkJobAlive(job: Job): Promise<boolean> {
   if (job.exec_mode !== "tmux" || job.tmux_sessions.length === 0) {
     return false;
   }
+  const results = await batchCheckJobsAlive([job]);
+  return results.get(job.id) ?? false;
+}
+
+/**
+ * Batch check multiple jobs' tmux sessions in a single Python process.
+ * Returns a Map<jobId, isAlive>.
+ */
+async function batchCheckJobsAlive(jobs: Job[]): Promise<Map<string, boolean>> {
+  const results = new Map<string, boolean>();
+  const tmuxJobs = jobs.filter(j => j.exec_mode === "tmux" && j.tmux_sessions.length > 0);
   
-  const tmpFile = `/tmp/opensmi-check-${crypto.randomUUID()}.json`;
-  await Bun.write(tmpFile, JSON.stringify(job));
+  if (tmuxJobs.length === 0) return results;
+  
+  const tmpFile = `/tmp/opensmi-batch-check-${crypto.randomUUID()}.json`;
+  await Bun.write(tmpFile, JSON.stringify(tmuxJobs));
   
   const checkScript = `
 import sys, json
@@ -854,37 +867,39 @@ from opensmi.state import resolve_config_path
 import asyncio
 
 with open("${tmpFile}", "r") as f:
-    job_data = json.load(f)
-
-job = Job(
-    id=job_data["id"],
-    command=job_data["command"],
-    commands=job_data["commands"],
-    gpus=[tuple(g) for g in job_data["gpus"]],
-    requested_gpu_count=job_data["requested_gpu_count"],
-    dist_mode=job_data["dist_mode"],
-    exec_mode=job_data["exec_mode"],
-    tmux_sessions=job_data["tmux_sessions"],
-    status=job_data["status"],
-    submitted_at=job_data["submitted_at"],
-    started_at=job_data.get("started_at"),
-    finished_at=job_data.get("finished_at"),
-    exit_codes=job_data["exit_codes"],
-    error=job_data.get("error"),
-    user=job_data["user"],
-    restart_policy=job_data["restart_policy"],
-    retry_count=job_data["retry_count"],
-    max_retries=job_data["max_retries"],
-    tags=job_data["tags"],
-    queue_mode=job_data["queue_mode"],
-)
+    jobs_data = json.load(f)
 
 cfg_path = resolve_config_path()
 cfg = load_config(cfg_path)
 
 async def main():
-    alive = await check_job_alive(job, cfg)
-    print("true" if alive else "false")
+    results = {}
+    for jd in jobs_data:
+        job = Job(
+            id=jd["id"],
+            command=jd["command"],
+            commands=jd["commands"],
+            gpus=[tuple(g) for g in jd["gpus"]],
+            requested_gpu_count=jd["requested_gpu_count"],
+            dist_mode=jd["dist_mode"],
+            exec_mode=jd["exec_mode"],
+            tmux_sessions=jd["tmux_sessions"],
+            status=jd["status"],
+            submitted_at=jd["submitted_at"],
+            started_at=jd.get("started_at"),
+            finished_at=jd.get("finished_at"),
+            exit_codes=jd["exit_codes"],
+            error=jd.get("error"),
+            user=jd["user"],
+            restart_policy=jd["restart_policy"],
+            retry_count=jd["retry_count"],
+            max_retries=jd["max_retries"],
+            tags=jd["tags"],
+            queue_mode=jd["queue_mode"],
+        )
+        alive = await check_job_alive(job, cfg)
+        results[jd["id"]] = alive
+    print(json.dumps(results))
 
 asyncio.run(main())
 `;
@@ -905,13 +920,20 @@ asyncio.run(main())
     } catch {}
     
     if (code !== 0) {
-      return false;
+      // Fallback: all unknown = not alive
+      for (const j of tmuxJobs) results.set(j.id, false);
+      return results;
     }
     
-    return stdout.trim() === "true";
+    const parsed = JSON.parse(stdout.trim());
+    for (const [id, alive] of Object.entries(parsed)) {
+      results.set(id, alive as boolean);
+    }
+    return results;
   } catch (e) {
-    console.error(`Failed to check job ${job.id} alive status:`, e);
-    return false;
+    console.error("Failed batch job alive check:", e);
+    for (const j of tmuxJobs) results.set(j.id, false);
+    return results;
   }
 }
 
@@ -922,10 +944,12 @@ async function watchRunningJobs(): Promise<void> {
     return;
   }
   
-  // Check each running job's tmux session health
+  // Batch check all running jobs in a single Python process
+  const aliveMap = await batchCheckJobsAlive(runningJobs);
+  
   for (const job of runningJobs) {
     try {
-      const alive = await checkJobAlive(job);
+      const alive = aliveMap.get(job.id) ?? false;
       
       if (!alive) {
         // Tmux session terminated - determine restart behavior based on policy
@@ -1003,6 +1027,23 @@ else:
 async function executeJobRemote(job: Job): Promise<void> {
   const tmuxSessions: string[] = [];
   
+  async function rollbackSessions() {
+    for (const session of tmuxSessions) {
+      try {
+        // Extract node from session name: opensmi-{id}-{node}[-gpu{n}]
+        const parts = session.replace(`opensmi-${job.id}-`, "").replace(/-gpu\d+$/, "");
+        const node = parts || (job.gpus[0]?.[0]);
+        if (!node) continue;
+        await executeRemoteExec({
+          node,
+          gpusCsv: "0",
+          mode: "direct",
+          command: `tmux kill-session -t ${session} 2>/dev/null || true`,
+        });
+      } catch {}
+    }
+  }
+  
   if (job.dist_mode === "single") {
     const nodesByGpu = new Map<string, number[]>();
     
@@ -1028,6 +1069,7 @@ async function executeJobRemote(job: Job): Promise<void> {
       });
       
       if (!payload.ok) {
+        await rollbackSessions();
         throw new Error(`Failed to execute on ${node}: ${payload.rawStderr.trim()}`);
       }
       
@@ -1058,6 +1100,7 @@ async function executeJobRemote(job: Job): Promise<void> {
       });
       
       if (!payload.ok) {
+        await rollbackSessions();
         throw new Error(`Failed to execute on ${node}:GPU${gpu}: ${payload.rawStderr.trim()}`);
       }