bench: prevent the generator to be started prior node creating the so…

…cket

bench/bench.sh

@@ -420,9 +420,15 @@ op_bench_start() {
              while now=$(date +%s); test $now -lt $((start_time + 15))
              do sleep 1; done; fi
 
+        oprint_ne "waiting until local node socket is up:  "
+        while ! { nixops ssh "$canary" -- journalctl -u cardano-node |
+                      grep "LocalSocketUp"; }
+        do sleep 1; echo -ne "."; done
+        echo "LocalSocketUp seen"
+
         if nixops ssh "$canary" -- journalctl -u cardano-node |
            grep "TraceNoLedgerView" >/dev/null
-        then fail "no ledger view, cluster is dead."; fi
+        then fail "cluster is dead:  seen TraceNoLedgerView"; fi
 
         tag=$(generate_run_tag "$batch" "$prof" "$node_commit")
         dir="./runs/${tag}"