diff --git a/scripts/gpuq_submit.sh b/scripts/gpuq_submit.sh
index c8dd044..72e9b06 100755
--- a/scripts/gpuq_submit.sh
+++ b/scripts/gpuq_submit.sh
@@ -1,12 +1,13 @@
 #!/bin/bash
-# Submit a job to a gpuq worker, or check queue status.
+# Submit jobs to gpuq workers.
 #
-#   gpuq_submit.sh <worker-id> <jobfile.sh> [more jobfiles...]
+#   gpuq_submit.sh <worker-id> <jobfile.sh> [...]     # pin to a worker
+#   gpuq_submit.sh --class <class> <jobfile.sh> [...] # pick idlest in class
 #   gpuq_submit.sh --status
 #
-# Ordering: jobs run oldest-first by NAME within a worker's queue; prefix
-# files 00_..., 01_... to force order. Load balancing is the submitter's
-# job — spread files across worker-ids (no work stealing, no races).
+# Class rosters live in the bucket: gpuq/_classes/<class>.txt (one worker id
+# per line). Scheduling: prefer workers with 0 pending AND <15% GPU util
+# (from the node heartbeat); tie-break by fewest pending, then random.
 
 set -eu
 if [ "$1" = "--status" ]; then
@@ -16,6 +17,33 @@ if [ "$1" = "--status" ]; then
   rclone lsl -R jspace:jspace/gpuq --include "done/*.sh" 2>/dev/null | sort -k2,3 | tail -20
   exit 0
 fi
+
+pick_worker() {  # $1 = class
+  local best="" best_score=999999
+  for w in $(rclone cat "jspace:jspace/gpuq/_classes/$1.txt" 2>/dev/null); do
+    local node=${w%-gpu*} gpu=${w##*-gpu}
+    local pend util score
+    pend=$(rclone lsf "jspace:jspace/gpuq/$w/pending/" --include "*.sh" 2>/dev/null | wc -l)
+    util=$(rclone cat "jspace:jspace/gpuq/_health/$node.txt" 2>/dev/null \
+           | grep -E "^$gpu, " | head -1 | awk -F', ' '{print $2}' | tr -dc 0-9)
+    util=${util:-100}
+    score=$((pend * 100 + util))
+    if [ "$score" -lt "$best_score" ]; then best=$w; best_score=$score; fi
+  done
+  echo "$best"
+}
+
+if [ "$1" = "--class" ]; then
+  CLASS=$2; shift 2
+  for f in "$@"; do
+    W=$(pick_worker "$CLASS")
+    [ -z "$W" ] && { echo "no workers in class $CLASS"; exit 1; }
+    rclone copy "$f" "jspace:jspace/gpuq/$W/pending/" -q
+    echo "queued $(basename $f) -> $W (class $CLASS)"
+  done
+  exit 0
+fi
+
 ID=$1; shift
 for f in "$@"; do
   rclone copy "$f" "jspace:jspace/gpuq/$ID/pending/" -q