diff --git a/run_experiments_multi_gpu.sh b/run_experiments_multi_gpu.sh
index db0c175..adcc403 100644
--- a/run_experiments_multi_gpu.sh
+++ b/run_experiments_multi_gpu.sh
@@ -4,7 +4,7 @@ set -euo pipefail
 usage() {
   cat <<'USAGE'
 Usage:
-  ./run_experiments_multi_gpu.sh --gpus 0,1,2 [--experiments experiments.txt] [--cmd "python train.py"] [--dry-run] [-- <extra train.py args>]
+  ./run_experiments_multi_gpu.sh --gpus 0,1,2 [--experiments experiments.txt] [--cmd "python train.py"] [--log-dir experiment_logs] [--dry-run] [-- <extra train.py args>]
 
 Description:
   Distributes rows from experiments.txt across multiple GPUs (round-robin) and runs
@@ -13,13 +13,14 @@ Description:
 Examples:
   ./run_experiments_multi_gpu.sh --gpus 0,1,2
   ./run_experiments_multi_gpu.sh --gpus 0,1 --experiments experiments.txt -- --batch_size 64 --max_epochs 50
-  ./run_experiments_multi_gpu.sh --gpus 3 --cmd "python train.py" -- --loss_type weibull
+  ./run_experiments_multi_gpu.sh --gpus 3 --cmd "python train.py" -- --loss_type discrete_time_cif
 USAGE
 }
 
 experiments_file="experiments.txt"
 gpu_list=""
 cmd_str="python train.py"
+log_dir="experiment_logs"
 dry_run=0
 extra_args=()
 
@@ -37,6 +38,10 @@ while [[ $# -gt 0 ]]; do
       cmd_str="${2-}"
       shift 2
       ;;
+    --log-dir)
+      log_dir="${2-}"
+      shift 2
+      ;;
     --dry-run)
       dry_run=1
       shift
@@ -63,6 +68,8 @@ if [[ -z "$gpu_list" ]]; then
   exit 2
 fi
 
+mkdir -p "$log_dir"
+
 if [[ ! -f "$experiments_file" ]]; then
   echo "Error: experiments file not found: $experiments_file" >&2
   exit 2
@@ -123,6 +130,13 @@ fi
 
 echo "Queued $exp_idx experiments across ${#gpus[@]} GPU(s): ${gpus[*]}"
 
+sanitize() {
+  # Replace any char outside [A-Za-z0-9._-] with '_'
+  local s="${1-}"
+  s="${s//[^A-Za-z0-9._-]/_}"
+  printf '%s' "$s"
+}
+
 pids=()
 for i in "${!gpus[@]}"; do
   gpu="${gpus[$i]}"
@@ -153,15 +167,52 @@ for i in "${!gpus[@]}"; do
 
       echo "[GPU $gpu] START exp $exp_id: model_type=$model_type loss_type=$loss_type age_encoder=$age_encoder full_cov=$full_cov"
 
+      ts="$(date +%Y%m%d-%H%M%S)"
+      safe_model="$(sanitize "$model_type")"
+      safe_loss="$(sanitize "$loss_type")"
+      safe_age="$(sanitize "$age_encoder")"
+      safe_cov="$(sanitize "$full_cov")"
+      log_file="${log_dir}/exp_${exp_id}_gpu${gpu}_${safe_model}_${safe_loss}_${safe_age}_${safe_cov}_${ts}.log"
+
+      {
+        echo "===== EXPERIMENT START ====="
+        echo "timestamp: $ts"
+        echo "gpu: $gpu"
+        echo "exp_id: $exp_id"
+        echo "model_type: $model_type"
+        echo "loss_type: $loss_type"
+        echo "age_encoder: $age_encoder"
+        echo "full_cov: $full_cov"
+        printf 'cmd:'
+        printf ' %q' "${run_cmd[@]}"
+        echo
+        echo "============================"
+      } > "$log_file"
+
       if [[ $dry_run -eq 1 ]]; then
         printf '[GPU %s] CMD: ' "$gpu"
         printf '%q ' "${run_cmd[@]}"
         echo
+        echo "[GPU $gpu] LOG: $log_file"
       else
-        "${run_cmd[@]}"
+        set +e
+        "${run_cmd[@]}" >> "$log_file" 2>&1
+        rc=$?
+        set -e
+
+        {
+          echo "============================"
+          echo "exit_code: $rc"
+          echo "===== EXPERIMENT END ======="
+        } >> "$log_file"
+
+        if [[ $rc -ne 0 ]]; then
+          echo "[GPU $gpu] FAIL exp $exp_id (exit=$rc). Log: $log_file" >&2
+          exit "$rc"
+        fi
       fi
 
-      echo "[GPU $gpu] DONE  exp $exp_id"
+      echo "[GPU $gpu] DONE  exp $exp_id (log: $log_file)"
     done < "$qfile"
   ) &