Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r483-tall-167912696400992.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool smart
Input is UtilityControlRoom-COL-Z2T4N02, examination is StateSpace
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 1
Run identifier is r483-tall-167912696400992
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 468K
-rw-r--r-- 1 mcc users 6.7K Feb 26 14:50 CTLCardinality.txt
-rw-r--r-- 1 mcc users 58K Feb 26 14:50 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 26 14:48 CTLFireability.txt
-rw-r--r-- 1 mcc users 39K Feb 26 14:48 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.1K Feb 25 17:24 LTLCardinality.txt
-rw-r--r-- 1 mcc users 22K Feb 25 17:24 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.8K Feb 25 17:24 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 17:24 LTLFireability.xml
-rw-r--r-- 1 mcc users 15K Feb 26 14:52 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 140K Feb 26 14:52 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Feb 26 14:52 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 75K Feb 26 14:52 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Feb 25 17:24 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K Feb 25 17:24 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_pt
-rw-r--r-- 1 mcc users 8 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 29K Mar 5 18:23 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

no data necessary for post analysis


=== Now, execution of the tool begins

BK_START 1679184208115

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=smart
BK_EXAMINATION=StateSpace
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=UtilityControlRoom-COL-Z2T4N02
Not applying reductions.
Model is COL
StateSpace PT
[2023-03-19 00:03:30] [INFO ] Running its-tools with arguments : [-pnfolder, ., -examination, StateSpace, --reduce-single, STATESPACE]
[2023-03-19 00:03:30] [INFO ] Parsing pnml file : /home/mcc/execution/./model.pnml
[2023-03-19 00:03:30] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2023-03-19 00:03:31] [WARNING] Using fallBack plugin, rng conformance not checked
[2023-03-19 00:03:31] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 722 ms
[2023-03-19 00:03:31] [INFO ] Imported 13 HL places and 12 HL transitions for a total of 38 PT places and 54.0 transition bindings in 20 ms.
[2023-03-19 00:03:31] [INFO ] Unfolded HLPN to a Petri net with 38 places and 54 transitions 170 arcs in 29 ms.
[2023-03-19 00:03:31] [INFO ] Unfolded 0 HLPN properties in 0 ms.
Ensure Unique test removed 8 transitions
Reduce isomorphic transitions removed 8 transitions.
Drop transitions removed 4 transitions
Redundant transition composition rules discarded 4 transitions
[2023-03-19 00:03:31] [INFO ] Export to PNML in file ./model.STATESPACE.pnml of net with 38 places, 42 transitions and 122 arcs took 6 ms.
Total runtime 967 ms.
======================================================
========== this is Smart for the MCC'2018 ============
======================================================
Running UtilityControlRoom (COL), instance Z2T4N02
Examination StateSpace
Parser /home/mcc/BenchKit/bin//../smart/bin//parser/StateSpaceParse.jar
Model checker /home/mcc/BenchKit/bin//../smart/bin//main//smart

Filename model.pnml
Petri model created: 38 places, 42 transitions, 122 arcs.
AT ITER 0 NEW BEST:: SOT 1058 SOS 602 HAS SOPS 602 HAS SOUS 513 HAS SOUPS 513 WITH SCORE 513.602
AT ITER 13 NEW BEST:: SOT 1058 SOS 601 HAS SOPS 601 HAS SOUS 513 HAS SOUPS 513 WITH SCORE 513.601
AT ITER 31 NEW BEST:: SOT 1058 SOS 619 HAS SOPS 619 HAS SOUS 491 HAS SOUPS 491 WITH SCORE 491.619
AT ITER 39 NEW BEST:: SOT 1052 SOS 583 HAS SOPS 583 HAS SOUS 477 HAS SOUPS 477 WITH SCORE 477.583
AT ITER 51 NEW BEST:: SOT 1052 SOS 579 HAS SOPS 579 HAS SOUS 473 HAS SOUPS 473 WITH SCORE 473.579
AT ITER 65 NEW BEST:: SOT 1045 SOS 556 HAS SOPS 556 HAS SOUS 461 HAS SOUPS 461 WITH SCORE 461.556
AT ITER 67 NEW BEST:: SOT 1039 SOS 555 HAS SOPS 555 HAS SOUS 455 HAS SOUPS 455 WITH SCORE 455.555
AT ITER 79 NEW BEST:: SOT 1035 SOS 548 HAS SOPS 548 HAS SOUS 448 HAS SOUPS 448 WITH SCORE 448.548
AT ITER 85 NEW BEST:: SOT 1017 SOS 534 HAS SOPS 534 HAS SOUS 432 HAS SOUPS 432 WITH SCORE 432.534
AT ITER 87 NEW BEST:: SOT 1023 SOS 535 HAS SOPS 535 HAS SOUS 426 HAS SOUPS 426 WITH SCORE 426.535
AT ITER 92 NEW BEST:: SOT 1015 SOS 523 HAS SOPS 523 HAS SOUS 417 HAS SOUPS 417 WITH SCORE 417.523
AT ITER 94 NEW BEST:: SOT 1015 SOS 522 HAS SOPS 522 HAS SOUS 416 HAS SOUPS 416 WITH SCORE 416.522
AT ITER 96 NEW BEST:: SOT 1015 SOS 521 HAS SOPS 521 HAS SOUS 415 HAS SOUPS 415 WITH SCORE 415.521
AT ITER 134 NEW BEST:: SOT 1015 SOS 519 HAS SOPS 519 HAS SOUS 414 HAS SOUPS 414 WITH SCORE 414.519
AT ITER 137 NEW BEST:: SOT 1014 SOS 518 HAS SOPS 518 HAS SOUS 413 HAS SOUPS 413 WITH SCORE 413.518
AT ITER 143 NEW BEST:: SOT 1014 SOS 514 HAS SOPS 514 HAS SOUS 413 HAS SOUPS 413 WITH SCORE 413.514
AT ITER 146 NEW BEST:: SOT 1014 SOS 515 HAS SOPS 515 HAS SOUS 412 HAS SOUPS 412 WITH SCORE 412.515
AT ITER 148 NEW BEST:: SOT 1011 SOS 511 HAS SOPS 511 HAS SOUS 408 HAS SOUPS 408 WITH SCORE 408.511
AT ITER 160 NEW BEST:: SOT 1011 SOS 506 HAS SOPS 506 HAS SOUS 406 HAS SOUPS 406 WITH SCORE 406.506
AT ITER 165 NEW BEST:: SOT 1011 SOS 506 HAS SOPS 506 HAS SOUS 404 HAS SOUPS 404 WITH SCORE 404.506
AT ITER 178 NEW BEST:: SOT 1009 SOS 506 HAS SOPS 506 HAS SOUS 402 HAS SOUPS 402 WITH SCORE 402.506
AT ITER 182 NEW BEST:: SOT 1006 SOS 500 HAS SOPS 500 HAS SOUS 398 HAS SOUPS 398 WITH SCORE 398.5
AT ITER 183 NEW BEST:: SOT 1005 SOS 498 HAS SOPS 498 HAS SOUS 397 HAS SOUPS 397 WITH SCORE 397.498
AT ITER 191 NEW BEST:: SOT 1004 SOS 509 HAS SOPS 509 HAS SOUS 394 HAS SOUPS 394 WITH SCORE 394.509
AT ITER 194 NEW BEST:: SOT 999 SOS 504 HAS SOPS 504 HAS SOUS 394 HAS SOUPS 394 WITH SCORE 394.504
AT ITER 245 NEW BEST:: SOT 991 SOS 488 HAS SOPS 488 HAS SOUS 390 HAS SOUPS 390 WITH SCORE 390.488
AT ITER 260 NEW BEST:: SOT 991 SOS 492 HAS SOPS 492 HAS SOUS 384 HAS SOUPS 384 WITH SCORE 384.492
AT ITER 294 NEW BEST:: SOT 988 SOS 483 HAS SOPS 483 HAS SOUS 378 HAS SOUPS 378 WITH SCORE 378.483
AT ITER 297 NEW BEST:: SOT 988 SOS 483 HAS SOPS 483 HAS SOUS 377 HAS SOUPS 377 WITH SCORE 377.483
AT ITER 305 NEW BEST:: SOT 988 SOS 480 HAS SOPS 480 HAS SOUS 376 HAS SOUPS 376 WITH SCORE 376.48
AT ITER 308 NEW BEST:: SOT 987 SOS 469 HAS SOPS 469 HAS SOUS 376 HAS SOUPS 376 WITH SCORE 376.469
AT ITER 349 NEW BEST:: SOT 987 SOS 468 HAS SOPS 468 HAS SOUS 376 HAS SOUPS 376 WITH SCORE 376.468
AT ITER 395 NEW BEST:: SOT 983 SOS 464 HAS SOPS 464 HAS SOUS 376 HAS SOUPS 376 WITH SCORE 376.464
AT ITER 403 NEW BEST:: SOT 983 SOS 463 HAS SOPS 463 HAS SOUS 376 HAS SOUPS 376 WITH SCORE 376.463
AT ITER 405 NEW BEST:: SOT 983 SOS 463 HAS SOPS 463 HAS SOUS 375 HAS SOUPS 375 WITH SCORE 375.463
AT ITER 413 NEW BEST:: SOT 981 SOS 461 HAS SOPS 461 HAS SOUS 373 HAS SOUPS 373 WITH SCORE 373.461
AT ITER 431 NEW BEST:: SOT 980 SOS 458 HAS SOPS 458 HAS SOUS 370 HAS SOUPS 370 WITH SCORE 370.458
AT ITER 453 NEW BEST:: SOT 975 SOS 453 HAS SOPS 453 HAS SOUS 365 HAS SOUPS 365 WITH SCORE 365.453
AT ITER 454 NEW BEST:: SOT 980 SOS 455 HAS SOPS 455 HAS SOUS 364 HAS SOUPS 364 WITH SCORE 364.455
AT ITER 456 NEW BEST:: SOT 978 SOS 453 HAS SOPS 453 HAS SOUS 362 HAS SOUPS 362 WITH SCORE 362.453
AT ITER 502 NEW BEST:: SOT 976 SOS 453 HAS SOPS 453 HAS SOUS 360 HAS SOUPS 360 WITH SCORE 360.453
AT ITER 503 NEW BEST:: SOT 975 SOS 453 HAS SOPS 453 HAS SOUS 356 HAS SOUPS 356 WITH SCORE 356.453
AT ITER 546 NEW BEST:: SOT 975 SOS 453 HAS SOPS 453 HAS SOUS 355 HAS SOUPS 355 WITH SCORE 355.453
AT ITER 581 NEW BEST:: SOT 974 SOS 452 HAS SOPS 452 HAS SOUS 354 HAS SOUPS 354 WITH SCORE 354.452
AT ITER 589 NEW BEST:: SOT 974 SOS 451 HAS SOPS 451 HAS SOUS 354 HAS SOUPS 354 WITH SCORE 354.451
AT ITER 604 NEW BEST:: SOT 973 SOS 450 HAS SOPS 450 HAS SOUS 353 HAS SOUPS 353 WITH SCORE 353.45
AT ITER 674 NEW BEST:: SOT 974 SOS 453 HAS SOPS 453 HAS SOUS 351 HAS SOUPS 351 WITH SCORE 351.453
AT ITER 689 NEW BEST:: SOT 973 SOS 452 HAS SOPS 452 HAS SOUS 347 HAS SOUPS 347 WITH SCORE 347.452
AT ITER 699 NEW BEST:: SOT 973 SOS 448 HAS SOPS 448 HAS SOUS 346 HAS SOUPS 346 WITH SCORE 346.448
AT ITER 739 NEW BEST:: SOT 973 SOS 446 HAS SOPS 446 HAS SOUS 345 HAS SOUPS 345 WITH SCORE 345.446
AT ITER 743 NEW BEST:: SOT 972 SOS 444 HAS SOPS 444 HAS SOUS 345 HAS SOUPS 345 WITH SCORE 345.444
AT ITER 748 NEW BEST:: SOT 968 SOS 433 HAS SOPS 433 HAS SOUS 343 HAS SOUPS 343 WITH SCORE 343.433
AT ITER 751 NEW BEST:: SOT 968 SOS 432 HAS SOPS 432 HAS SOUS 342 HAS SOUPS 342 WITH SCORE 342.432
AT ITER 838 NEW BEST:: SOT 969 SOS 425 HAS SOPS 425 HAS SOUS 341 HAS SOUPS 341 WITH SCORE 341.425
AT ITER 862 NEW BEST:: SOT 965 SOS 421 HAS SOPS 421 HAS SOUS 336 HAS SOUPS 336 WITH SCORE 336.421
AT ITER 948 NEW BEST:: SOT 964 SOS 419 HAS SOPS 419 HAS SOUS 335 HAS SOUPS 335 WITH SCORE 335.419
AT ITER 956 NEW BEST:: SOT 965 SOS 418 HAS SOPS 418 HAS SOUS 334 HAS SOUPS 334 WITH SCORE 334.418
AT ITER 1009 NEW BEST:: SOT 968 SOS 416 HAS SOPS 416 HAS SOUS 334 HAS SOUPS 334 WITH SCORE 334.416
AT ITER 1094 NEW BEST:: SOT 964 SOS 426 HAS SOPS 426 HAS SOUS 333 HAS SOUPS 333 WITH SCORE 333.426
AT ITER 1099 NEW BEST:: SOT 962 SOS 424 HAS SOPS 424 HAS SOUS 331 HAS SOUPS 331 WITH SCORE 331.424
AT ITER 1141 NEW BEST:: SOT 962 SOS 427 HAS SOPS 427 HAS SOUS 328 HAS SOUPS 328 WITH SCORE 328.427
AT ITER 1362 NEW BEST:: SOT 962 SOS 426 HAS SOPS 426 HAS SOUS 326 HAS SOUPS 326 WITH SCORE 326.426
AT ITER 1405 NEW BEST:: SOT 962 SOS 425 HAS SOPS 425 HAS SOUS 326 HAS SOUPS 326 WITH SCORE 326.425
AT ITER 1436 NEW BEST:: SOT 962 SOS 424 HAS SOPS 424 HAS SOUS 326 HAS SOUPS 326 WITH SCORE 326.424
AT ITER 1497 NEW BEST:: SOT 962 SOS 422 HAS SOPS 422 HAS SOUS 326 HAS SOUPS 326 WITH SCORE 326.422
AT ITER 1536 NEW BEST:: SOT 961 SOS 420 HAS SOPS 420 HAS SOUS 324 HAS SOUPS 324 WITH SCORE 324.42
AT ITER 1580 NEW BEST:: SOT 961 SOS 423 HAS SOPS 423 HAS SOUS 323 HAS SOUPS 323 WITH SCORE 323.423
AT ITER 1803 NEW BEST:: SOT 961 SOS 419 HAS SOPS 419 HAS SOUS 323 HAS SOUPS 323 WITH SCORE 323.419
AT ITER 2103 NEW BEST:: SOT 960 SOS 427 HAS SOPS 427 HAS SOUS 322 HAS SOUPS 322 WITH SCORE 322.427
AT ITER 2481 NEW BEST:: SOT 959 SOS 426 HAS SOPS 426 HAS SOUS 322 HAS SOUPS 322 WITH SCORE 322.426
AT ITER 2589 NEW BEST:: SOT 959 SOS 425 HAS SOPS 425 HAS SOUS 322 HAS SOUPS 322 WITH SCORE 322.425
AT ITER 2642 NEW BEST:: SOT 960 SOS 432 HAS SOPS 432 HAS SOUS 321 HAS SOUPS 321 WITH SCORE 321.432
AT ITER 2789 NEW BEST:: SOT 960 SOS 436 HAS SOPS 436 HAS SOUS 320 HAS SOUPS 320 WITH SCORE 320.436
AT ITER 2904 NEW BEST:: SOT 963 SOS 439 HAS SOPS 439 HAS SOUS 318 HAS SOUPS 318 WITH SCORE 318.439
AT ITER 2909 NEW BEST:: SOT 962 SOS 438 HAS SOPS 438 HAS SOUS 317 HAS SOUPS 317 WITH SCORE 317.438
AT ITER 2923 NEW BEST:: SOT 960 SOS 437 HAS SOPS 437 HAS SOUS 316 HAS SOUPS 316 WITH SCORE 316.437
AT ITER 3050 NEW BEST:: SOT 960 SOS 437 HAS SOPS 437 HAS SOUS 315 HAS SOUPS 315 WITH SCORE 315.437
AT ITER 3130 NEW BEST:: SOT 960 SOS 434 HAS SOPS 434 HAS SOUS 315 HAS SOUPS 315 WITH SCORE 315.434
AT ITER 3214 NEW BEST:: SOT 960 SOS 441 HAS SOPS 441 HAS SOUS 314 HAS SOUPS 314 WITH SCORE 314.441
AT ITER 3235 NEW BEST:: SOT 962 SOS 443 HAS SOPS 443 HAS SOUS 313 HAS SOUPS 313 WITH SCORE 313.443
AT ITER 3251 NEW BEST:: SOT 962 SOS 440 HAS SOPS 440 HAS SOUS 313 HAS SOUPS 313 WITH SCORE 313.44
AT ITER 3271 NEW BEST:: SOT 962 SOS 440 HAS SOPS 440 HAS SOUS 312 HAS SOUPS 312 WITH SCORE 312.44
AT ITER 3283 NEW BEST:: SOT 963 SOS 437 HAS SOPS 437 HAS SOUS 311 HAS SOUPS 311 WITH SCORE 311.437
AT ITER 3357 NEW BEST:: SOT 962 SOS 436 HAS SOPS 436 HAS SOUS 310 HAS SOUPS 310 WITH SCORE 310.436
AT ITER 4042 NEW BEST:: SOT 962 SOS 431 HAS SOPS 431 HAS SOUS 310 HAS SOUPS 310 WITH SCORE 310.431
AT ITER 4116 NEW BEST:: SOT 962 SOS 426 HAS SOPS 426 HAS SOUS 310 HAS SOUPS 310 WITH SCORE 310.426
STATE_SPACE STATES 1092 TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
STATE_SPACE MAX_TOKEN_IN_PLACE 4 TECHNIQUES SEQUENTIAL_PROCESSING IMPLICIT RELATIONS DECISION_DIAGRAMS
STATE_SPACE MAX_TOKEN_PER_MARKING 12 TECHNIQUES SEQUENTIAL_PROCESSING IMPLICIT RELATIONS DECISION_DIAGRAMS
STATE_SPACE TRANSITIONS 3392 TECHNIQUES SEQUENTIAL_PROCESSING IMPLICIT RELATIONS DECISION_DIAGRAMS

BK_STOP 1679184214548

--------------------
content from stderr:

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="UtilityControlRoom-COL-Z2T4N02"
export BK_EXAMINATION="StateSpace"
export BK_TOOL="smart"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
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 2-5348"
echo " Executing tool smart"
echo " Input is UtilityControlRoom-COL-Z2T4N02, examination is StateSpace"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 1"
echo " Run identifier is r483-tall-167912696400992"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/UtilityControlRoom-COL-Z2T4N02.tgz
mv UtilityControlRoom-COL-Z2T4N02 execution
cd execution
if [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "UpperBounds" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] || [ "StateSpace" = "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 [ "StateSpace" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StateSpace" != "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 "StateSpace.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property StateSpace.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "StateSpace.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 '' StateSpace.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] ; then
echo "FORMULA_NAME StateSpace"
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 ;