About the Execution of LoLA for EnergyBus-PT-none
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
92.892 | 3316.00 | 3128.00 | 22.50 | T | normal |
Execution Chart
We display below the execution chart for this examination (boot time has been removed).
Trace from the execution
Formatting '/data/fkordon/mcc2021-input.r087-tall-162048883700425.qcow2', fmt=qcow2 size=4294967296 backing_file='/data/fkordon/mcc2021-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool lola
Input is EnergyBus-PT-none, examination is OneSafe
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r087-tall-162048883700425
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 3.6M
-rw-r--r-- 1 mcc users 15K May 5 16:58 CTLCardinality.txt
-rw-r--r-- 1 mcc users 151K May 5 16:58 CTLCardinality.xml
-rw-r--r-- 1 mcc users 9.9K May 5 16:58 CTLFireability.txt
-rw-r--r-- 1 mcc users 87K May 5 16:58 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 6 14:48 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.1K Mar 28 16:07 LTLCardinality.txt
-rw-r--r-- 1 mcc users 23K Mar 28 16:07 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.0K Mar 28 16:07 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Mar 28 16:07 LTLFireability.xml
-rw-r--r-- 1 mcc users 3.4K Mar 23 10:42 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 18K Mar 23 10:42 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Mar 22 18:44 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 11K Mar 22 18:44 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Mar 22 09:11 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Mar 22 09:11 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 5 16:51 equiv_col
-rw-r--r-- 1 mcc users 5 May 5 16:51 instance
-rw-r--r-- 1 mcc users 6 May 5 16:51 iscolored
-rw-r--r-- 1 mcc users 3.2M May 5 16:51 model.pnml
--------------------
content from stdout:
=== Data for post analysis generated by BenchKit (invocation template)
The expected result is a vector of booleans
BOOL_VECTOR
FORMULA_NAME OneSafe
=== Now, execution of the tool begins
BK_START 1620575157838
starting LoLA
BK_INPUT EnergyBus-PT-none
BK_EXAMINATION: OneSafe
bin directory: /home/mcc/BenchKit/bin
current directory: /home/mcc/execution
GlobalProperty: OneSafe
FORMULA OneSafe TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
BK_STOP 1620575161154
--------------------
content from stderr:
lola: MEM LIMIT 32
lola: MEM LIMIT 5
lola: NET
lola: input: PNML file (--pnmlnet)
lola: reading net from /home/mcc/execution/model.pnml
lola: reading pnml
lola: PNML file contains place/transition net
lola: finished parsing
lola: closed net file /home/mcc/execution/model.pnml
lola: REM DEA TR: t = t2401
lola: REM DEA TR: t = t2403
lola: REM DEA TR: t = t2405
lola: REM DEA TR: t = t2407
lola: REM DEA TR: t = t2409
lola: REM DEA TR: t = t2411
lola: REM DEA TR: t = t2413
lola: REM DEA TR: t = t2415
lola: REM DEA TR: t = t2418
lola: REM DEA TR: t = t2421
lola: REM DEA TR: t = t2423
lola: REM DEA TR: t = t2425
lola: REM DEA TR: t = t2427
lola: REM DEA TR: t = t2429
lola: REM DEA TR: t = t2431
lola: REM DEA TR: t = t2433
lola: REM DEA TR: t = t2435
lola: REM DEA TR: t = t2437
lola: REM DEA TR: t = t2439
lola: REM DEA TR: t = t2441
lola: REM DEA TR: t = t2443
lola: REM DEA TR: t = t2445
lola: REM DEA TR: t = t2447
lola: REM DEA TR: t = t2449
lola: REM DEA TR: t = t2451
lola: REM DEA TR: t = t2453
lola: REM DEA TR: t = t2455
lola: REM DEA TR: t = t2457
lola: REM DEA TR: t = t2459
lola: REM DEA TR: t = t2461
lola: REM DEA TR: t = t2463
lola: REM DEA TR: t = t2465
lola: REM DEA TR: t = t2467
lola: REM DEA TR: t = t2469
lola: REM DEA TR: t = t2471
lola: REM DEA TR: t = t2473
lola: REM DEA TR: t = t2475
lola: REM DEA TR: t = t2477
lola: REM DEA TR: t = t2479
lola: REM DEA TR: t = t2481
lola: REM DEA TR: t = t2484
lola: REM DEA TR: t = t2487
lola: REM DEA TR: t = t2489
lola: REM DEA TR: t = t2491
lola: REM DEA TR: t = t2493
lola: REM DEA TR: t = t2495
lola: REM DEA TR: t = t2497
lola: REM DEA TR: t = t2499
lola: REM DEA TR: t = t20
lola: REM DEA TR: t = t2501
lola: REM DEA TR: t = t2503
lola: REM DEA TR: t = t2505
lola: REM DEA TR: t = t2507
lola: REM DEA TR: t = t2509
lola: REM DEA TR: t = t2511
lola: REM DEA TR: t = t2513
lola: REM DEA TR: t = t2515
lola: REM DEA TR: t = t2517
lola: REM DEA TR: t = t2519
lola: REM DEA TR: t = t2521
lola: REM DEA TR: t = t2523
lola: REM DEA TR: t = t2525
lola: REM DEA TR: t = t2527
lola: REM DEA TR: t = t2529
lola: REM DEA TR: t = t2531
lola: REM DEA TR: t = t2533
lola: REM DEA TR: t = t2535
lola: REM DEA TR: t = t2537
lola: REM DEA TR: t = t2539
lola: REM DEA TR: t = t2541
lola: REM DEA TR: t = t2543
lola: REM DEA TR: t = t2545
lola: REM DEA TR: t = t2547
lola: REM DEA TR: t = t2550
lola: REM DEA TR: t = t2553
lola: REM DEA TR: t = t2555
lola: REM DEA TR: t = t2557
lola: REM DEA TR: t = t2559
lola: REM DEA TR: t = t2561
lola: REM DEA TR: t = t2563
lola: REM DEA TR: t = t2565
lola: REM DEA TR: t = t2567
lola: REM DEA TR: t = t2569
lola: REM DEA TR: t = t2571
lola: REM DEA TR: t = t2573
lola: REM DEA TR: t = t2575
lola: REM DEA TR: t = t2577
lola: REM DEA TR: t = t2579
lola: REM DEA TR: t = t2581
lola: REM DEA TR: t = t2583
lola: REM DEA TR: t = t2585
lola: REM DEA TR: t = t2587
lola: REM DEA TR: t = t2589
lola: REM DEA TR: t = t2591
lola: REM DEA TR: t = t2593
lola: REM DEA TR: t = t2595
lola: REM DEA TR: t = t2597
lola: REM DEA TR: t = t2599
lola: REM DEA TR: t = t2601
lola: REM DEA TR: t = t2603
lola: REM DEA TR: t = t2605
lola: REM DEA TR: t = t2607
lola: REM DEA TR: t = t2609
lola: REM DEA TR: t = t2611
lola: REM DEA TR: t = t2613
lola: REM DEA TR: t = t2615
lola: REM DEA TR: t = t2617
lola: REM DEA TR: t = t2619
lola: REM DEA TR: t = t2621
lola: REM DEA TR: t = t2623
lola: REM DEA TR: t = t2625
lola: REM DEA TR: t = t2627
lola: REM DEA TR: t = t2629
lola: REM DEA TR: t = t2632
lola: REM DEA TR: t = t2635
lola: REM DEA TR: t = t2637
lola: REM DEA TR: t = t2639
lola: REM DEA TR: t = t2641
lola: REM DEA TR: t = t2643
lola: REM DEA TR: t = t2645
lola: REM DEA TR: t = t2647
lola: REM DEA TR: t = t2649
lola: REM DEA TR: t = t2651
lola: REM DEA TR: t = t2653
lola: REM DEA TR: t = t2655
lola: REM DEA TR: t = t2657
lola: REM DEA TR: t = t2659
lola: REM DEA TR: t = t2661
lola: REM DEA TR: t = t2663
lola: REM DEA TR: t = t2665
lola: REM DEA TR: t = t2667
lola: REM DEA TR: t = t2669
lola: REM DEA TR: t = t2671
lola: REM DEA TR: t = t2673
lola: REM DEA TR: t = t2675
lola: REM DEA TR: t = t2677
lola: REM DEA TR: t = t2679
lola: REM DEA TR: t = t2681
lola: REM DEA TR: t = t2683
lola: REM DEA TR: t = t2685
lola: REM DEA TR: t = t2687
lola: REM DEA TR: t = t2689
lola: REM DEA TR: t = t2691
lola: REM DEA TR: t = t2693
lola: REM DEA TR: t = t2695
lola: REM DEA TR: t = t2698
lola: REM DEA TR: t = t2701
lola: REM DEA TR: t = t2703
lola: REM DEA TR: t = t2705
lola: REM DEA TR: t = t2707
lola: REM DEA TR: t = t2709
lola: REM DEA TR: t = t2711
lola: REM DEA TR: t = t2713
lola: REM DEA TR: t = t2715
lola: REM DEA TR: t = t2717
lola: REM DEA TR: t = t2719
lola: REM DEA TR: t = t2721
lola: REM DEA TR: t = t2723
lola: REM DEA TR: t = t2725
lola: REM DEA TR: t = t2727
lola: REM DEA TR: t = t2729
lola: REM DEA TR: t = t2731
lola: REM DEA TR: t = t2733
lola: REM DEA TR: t = t2735
lola: REM DEA TR: t = t2737
lola: REM DEA TR: t = t2739
lola: REM DEA TR: t = t2741
lola: REM DEA TR: t = t2743
lola: REM DEA TR: t = t2745
lola: REM DEA TR: t = t2747
lola: REM DEA TR: t = t2749
lola: REM DEA TR: t = t2751
lola: REM DEA TR: t = t2753
lola: REM DEA TR: t = t2755
lola: REM DEA TR: t = t2757
lola: REM DEA TR: t = t2759
lola: REM DEA TR: t = t2761
lola: REM DEA TR: t = t2764
lola: REM DEA TR: t = t2767
lola: REM DEA TR: t = t2769
lola: REM DEA TR: t = t2771
lola: REM DEA TR: t = t2773
lola: REM DEA TR: t = t2775
lola: REM DEA TR: t = t2777
lola: REM DEA TR: t = t2779
lola: REM DEA TR: t = t2781
lola: REM DEA TR: t = t2783
lola: REM DEA TR: t = t2785
lola: REM DEA TR: t = t2787
lola: REM DEA TR: t = t2789
lola: REM DEA TR: t = t2791
lola: REM DEA TR: t = t2793
lola: REM DEA TR: t = t2795
lola: REM DEA TR: t = t2797
lola: REM DEA TR: t = t2799
lola: REM DEA TR: t = t2801
lola: REM DEA TR: t = t2803
lola: REM DEA TR: t = t2805
lola: REM DEA TR: t = t2807
lola: REM DEA TR: t = t2809
lola: REM DEA TR: t = t2811
lola: REM DEA TR: t = t2813
lola: REM DEA TR: t = t2815
lola: REM DEA TR: t = t2817
lola: REM DEA TR: t = t2819
lola: REM DEA TR: t = t2821
lola: REM DEA TR: t = t2823
lola: REM DEA TR: t = t2825
lola: REM DEA TR: t = t2827
lola: REM DEA TR: t = t2830
lola: REM DEA TR: t = t2833
lola: REM DEA TR: t = t2835
lola: REM DEA TR: t = t2837
lola: REM DEA TR: t = t2839
lola: REM DEA TR: t = t2841
lola: REM DEA TR: t = t2843
lola: REM DEA TR: t = t2845
lola: REM DEA TR: t = t2847
lola: REM DEA TR: t = t2849
lola: REM DEA TR: t = t2851
lola: REM DEA TR: t = t2853
lola: REM DEA TR: t = t2855
lola: REM DEA TR: t = t2857
lola: REM DEA TR: t = t2859
lola: REM DEA TR: t = t2861
lola: REM DEA TR: t = t2863
lola: REM DEA TR: t = t2865
lola: REM DEA TR: t = t2867
lola: REM DEA TR: t = t2869
lola: REM DEA TR: t = t2871
lola: REM DEA TR: t = t2873
lola: REM DEA TR: t = t2875
lola: REM DEA TR: t = t2877
lola: REM DEA TR: t = t2879
lola: REM DEA TR: t = t2881
lola: REM DEA TR: t = t2883
lola: REM DEA TR: t = t2885
lola: REM DEA TR: t = t2887
lola: REM DEA TR: t = t2889
lola: REM DEA TR: t = t2891
lola: REM DEA TR: t = t2893
lola: REM DEA TR: t = t2895
lola: REM DEA TR: t = t2897
lola: REM DEA TR: t = t4381
lola: REM DEA TR: t = t2339
lola: REM DEA TR: t = t2341
lola: REM DEA TR: t = t2343
lola: REM DEA TR: t = t2345
lola: REM DEA TR: t = t2347
lola: REM DEA TR: t = t2349
lola: REM DEA TR: t = t2352
lola: REM DEA TR: t = t2355
lola: REM DEA TR: t = t2357
lola: REM DEA TR: t = t2359
lola: REM DEA TR: t = t2361
lola: REM DEA TR: t = t2363
lola: REM DEA TR: t = t2365
lola: REM DEA TR: t = t2367
lola: REM DEA TR: t = t2369
lola: REM DEA TR: t = t2371
lola: REM DEA TR: t = t2373
lola: REM DEA TR: t = t2375
lola: REM DEA TR: t = t2377
lola: REM DEA TR: t = t2379
lola: REM DEA TR: t = t2381
lola: REM DEA TR: t = t2383
lola: REM DEA TR: t = t2385
lola: REM DEA TR: t = t2387
lola: REM DEA TR: t = t2389
lola: REM DEA TR: t = t2391
lola: REM DEA TR: t = t2393
lola: REM DEA TR: t = t2395
lola: REM DEA TR: t = t2397
lola: REM DEA TR: t = t2399
lola: REM DEA TR: t = t2899
lola: REM DEA TR: t = t2901
lola: REM DEA TR: t = t2903
lola: REM DEA TR: t = t2905
lola: REM DEA TR: t = t2907
lola: REM DEA TR: t = t2909
lola: REM DEA TR: t = t2911
lola: REM DEA TR: t = t2913
lola: REM DEA TR: t = t2915
lola: REM DEA TR: t = t2917
lola: REM DEA TR: t = t2919
lola: REM DEA TR: t = t2921
lola: REM DEA TR: t = t2923
lola: REM DEA TR: t = t2925
lola: REM DEA TR: t = t2927
lola: REM DEA TR: t = t2929
lola: REM DEA TR: t = t2931
lola: REM DEA TR: t = t2933
lola: REM DEA TR: t = t2935
lola: REM DEA TR: t = t2937
lola: REM DEA TR: t = t2939
lola: REM DEA TR: t = t2941
lola: REM DEA TR: t = t2943
lola: REM DEA TR: t = t2945
lola: REM DEA TR: t = t2947
lola: REM DEA TR: t = t2949
lola: REM DEA TR: t = t2951
lola: REM DEA TR: t = t2953
lola: REM DEA TR: t = t2955
lola: REM DEA TR: t = t2957
lola: REM DEA TR: t = t2959
lola: REM DEA TR: t = t2961
lola: REM DEA TR: t = t2963
lola: REM DEA TR: t = t2965
lola: REM DEA TR: t = t2967
lola: REM DEA TR: t = t2969
lola: REM DEA TR: t = t2971
lola: REM DEA TR: t = t2973
lola: REM DEA TR: t = t2975
lola: REM DEA TR: t = t2977
lola: REM DEA TR: t = t2979
lola: REM DEA TR: t = t2981
lola: REM DEA TR: t = t2983
lola: REM DEA TR: t = t2985
lola: REM DEA TR: t = t2987
lola: REM DEA TR: t = t2989
lola: REM DEA TR: t = t2991
lola: REM DEA TR: t = t2993
lola: REM DEA TR: t = t2995
lola: REM DEA TR: t = t2997
lola: REM DEA TR: t = t2999
lola: REM DEA TR: t = t3001
lola: REM DEA TR: t = t3003
lola: REM DEA TR: t = t3005
lola: REM DEA TR: t = t3007
lola: REM DEA TR: t = t3009
lola: REM DEA TR: t = t3011
lola: REM DEA TR: t = t3013
lola: REM DEA TR: t = t3015
lola: REM DEA TR: t = t3017
lola: REM DEA TR: t = t3019
lola: REM DEA TR: t = t3021
lola: REM DEA TR: t = t3023
lola: REM DEA TR: t = t3025
lola: REM DEA TR: t = t3027
lola: REM DEA TR: t = t3029
lola: REM DEA TR: t = t3031
lola: REM DEA TR: t = t3033
lola: REM DEA TR: t = t3035
lola: REM DEA TR: t = t3037
lola: REM DEA TR: t = t3039
lola: REM DEA TR: t = t3041
lola: REM DEA TR: t = t3043
lola: REM DEA TR: t = t3045
lola: REM DEA TR: t = t3047
lola: REM DEA TR: t = t3049
lola: REM DEA TR: t = t4382
lola: REM DEA TR: t = t3051
lola: REM DEA TR: t = t4383
lola: REM DEA TR: t = t4384
lola: REM DEA TR: t = t3053
lola: REM DEA TR: t = t3055
lola: REM DEA TR: t = t3057
lola: REM DEA TR: t = t3059
lola: REM DEA TR: t = t3061
lola: REM DEA TR: t = t3063
lola: REM DEA TR: t = t3065
lola: REM DEA TR: t = t3067
lola: REM DEA TR: t = t3069
lola: REM DEA TR: t = t3071
lola: REM DEA TR: t = t3073
lola: REM DEA TR: t = t3075
lola: REM DEA TR: t = t3077
lola: REM DEA TR: t = t3079
lola: REM DEA TR: t = t3081
lola: REM DEA TR: t = t3083
lola: REM DEA TR: t = t3085
lola: REM DEA TR: t = t3087
lola: REM DEA TR: t = t3089
lola: REM DEA TR: t = t3091
lola: REM DEA TR: t = t3093
lola: REM DEA TR: t = t3095
lola: REM DEA TR: t = t3097
lola: REM DEA TR: t = t3099
lola: REM DEA TR: t = t3101
lola: REM DEA TR: t = t3103
lola: REM DEA TR: t = t3105
lola: REM DEA TR: t = t3107
lola: REM DEA TR: t = t3109
lola: REM DEA TR: t = t3111
lola: REM DEA TR: t = t3113
lola: REM DEA TR: t = t3115
lola: REM DEA TR: t = t3117
lola: REM DEA TR: t = t3119
lola: REM DEA TR: t = t3121
lola: REM DEA TR: t = t3123
lola: REM DEA TR: t = t3125
lola: REM DEA TR: t = t3127
lola: REM DEA TR: t = t3129
lola: REM DEA TR: t = t3131
lola: REM DEA TR: t = t3133
lola: REM DEA TR: t = t3135
lola: REM DEA TR: t = t3137
lola: REM DEA TR: t = t3139
lola: REM DEA TR: t = t3141
lola: REM DEA TR: t = t3143
lola: REM DEA TR: t = t3145
lola: REM DEA TR: t = t3147
lola: REM DEA TR: t = t3149
lola: REM DEA TR: t = t3151
lola: REM DEA TR: t = t3153
lola: 3 The net is safe
Sequence of Actions to be Executed by the VM
This is useful if one wants to reexecute the tool in the VM from the submitted image disk.
set -x
# this is for BenchKit: configuration of major elements for the test
export BK_INPUT="EnergyBus-PT-none"
export BK_EXAMINATION="OneSafe"
export BK_TOOL="lola"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"
# this is specific to your benchmark or test
export BIN_DIR="$HOME/BenchKit/bin"
# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi
# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-4028"
echo " Executing tool lola"
echo " Input is EnergyBus-PT-none, examination is OneSafe"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r087-tall-162048883700425"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/EnergyBus-PT-none.tgz
mv EnergyBus-PT-none execution
cd execution
if [ "OneSafe" = "ReachabilityDeadlock" ] || [ "OneSafe" = "UpperBounds" ] || [ "OneSafe" = "QuasiLiveness" ] || [ "OneSafe" = "StableMarking" ] || [ "OneSafe" = "Liveness" ] || [ "OneSafe" = "OneSafe" ] || [ "OneSafe" = "StateSpace" ]; then
rm -f GenericPropertiesVerdict.xml
fi
pwd
ls -lh
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "OneSafe" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "OneSafe" != "StateSpace" ] ; then
echo "The expected result is a vector of booleans"
echo BOOL_VECTOR
else
echo "no data necessary for post analysis"
fi
echo
if [ -f "OneSafe.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property OneSafe.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "OneSafe.xml" ] ; then # for cunf (txt files deleted;-)
echo echo "here is the order used to build the result vector(from xml file)"
for x in $(grep '
echo "FORMULA_NAME $x"
done
elif [ "OneSafe" = "ReachabilityDeadlock" ] || [ "OneSafe" = "QuasiLiveness" ] || [ "OneSafe" = "StableMarking" ] || [ "OneSafe" = "Liveness" ] || [ "OneSafe" = "OneSafe" ] ; then
echo "FORMULA_NAME OneSafe"
fi
echo
echo "=== Now, execution of the tool begins"
echo
echo -n "BK_START "
date -u +%s%3N
echo
timeout -s 9 $BK_TIME_CONFINEMENT bash -c "/home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n \"BK_STOP \" ; date -u +%s%3N"
if [ $? -eq 137 ] ; then
echo
echo "BK_TIME_CONFINEMENT_REACHED"
fi
echo
echo "--------------------"
echo "content from stderr:"
echo
cat STDERR ;