fond
Model Checking Contest 2018
8th edition, Bratislava, Slovakia, June 26, 2018
Execution of r115-csrt-152666474000422
Last Updated
June 26, 2018

About the Execution of Irma.struct for Parking-PT-864

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
821.850 19214.00 31437.00 271.40 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 normal

Execution Chart

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

Trace from the execution

Waiting for the VM to be ready (probing ssh)
..........................
/home/mcc/execution
total 592K
-rw-r--r-- 1 mcc users 3.8K May 15 18:54 CTLCardinality.txt
-rw-r--r-- 1 mcc users 22K May 15 18:54 CTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K May 15 18:54 CTLFireability.txt
-rw-r--r-- 1 mcc users 17K May 15 18:54 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K May 15 18:50 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.1K May 15 18:50 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 2.3K May 15 18:54 LTLCardinality.txt
-rw-r--r-- 1 mcc users 11K May 15 18:54 LTLCardinality.xml
-rw-r--r-- 1 mcc users 1.8K May 15 18:54 LTLFireability.txt
-rw-r--r-- 1 mcc users 8.4K May 15 18:54 LTLFireability.xml
-rw-r--r-- 1 mcc users 2.8K May 15 18:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 13K May 15 18:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 105 May 15 18:54 ReachabilityDeadlock.txt
-rw-r--r-- 1 mcc users 343 May 15 18:54 ReachabilityDeadlock.xml
-rw-r--r-- 1 mcc users 2.5K May 15 18:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 14K May 15 18:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K May 15 18:54 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K May 15 18:54 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 15 18:50 equiv_col
-rw-r--r-- 1 mcc users 4 May 15 18:50 instance
-rw-r--r-- 1 mcc users 6 May 15 18:50 iscolored
-rw-r--r-- 1 mcc users 427K May 15 18:50 model.pnml
=====================================================================
Generated by BenchKit 2-3637
Executing tool irma4mcc-structural
Input is Parking-PT-864, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r115-csrt-152666474000422
=====================================================================


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

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

The expected result is a vector of positive values
NUM_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME Parking-PT-864-UpperBounds-00
FORMULA_NAME Parking-PT-864-UpperBounds-01
FORMULA_NAME Parking-PT-864-UpperBounds-02
FORMULA_NAME Parking-PT-864-UpperBounds-03
FORMULA_NAME Parking-PT-864-UpperBounds-04
FORMULA_NAME Parking-PT-864-UpperBounds-05
FORMULA_NAME Parking-PT-864-UpperBounds-06
FORMULA_NAME Parking-PT-864-UpperBounds-07
FORMULA_NAME Parking-PT-864-UpperBounds-08
FORMULA_NAME Parking-PT-864-UpperBounds-09
FORMULA_NAME Parking-PT-864-UpperBounds-10
FORMULA_NAME Parking-PT-864-UpperBounds-11
FORMULA_NAME Parking-PT-864-UpperBounds-12
FORMULA_NAME Parking-PT-864-UpperBounds-13
FORMULA_NAME Parking-PT-864-UpperBounds-14
FORMULA_NAME Parking-PT-864-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1527153215029


BK_STOP 1527153234243

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

Prefix is 75f5f979.
Reading known information in /usr/share/mcc4mcc/75f5f979-known.json.
Reading learned information in /usr/share/mcc4mcc/75f5f979-learned.json.
Reading value translations in /usr/share/mcc4mcc/75f5f979-values.json.
Using directory /home/mcc/execution for input, as it contains a model.pnml file.
Using Parking-PT-864 as instance name.
Using Parking as model name.
Using algorithm or tool random-forest.
Model characteristics are: {'Examination': 'UpperBounds', 'Place/Transition': True, 'Colored': False, 'Relative-Time': 1, 'Relative-Memory': 1, 'Ordinary': True, 'Simple Free Choice': False, 'Extended Free Choice': False, 'State Machine': False, 'Marked Graph': False, 'Connected': True, 'Strongly Connected': False, 'Source Place': True, 'Sink Place': False, 'Source Transition': False, 'Sink Transition': False, 'Loop Free': False, 'Conservative': False, 'Sub-Conservative': False, 'Nested Units': True, 'Safe': True, 'Deadlock': True, 'Reversible': False, 'Quasi Live': True, 'Live': False}.
Known tools are: [{'Time': 10398, 'Memory': 405.48, 'Tool': 'itstools'}, {'Time': 10807, 'Memory': 388.92, 'Tool': 'itstools'}, {'Time': 12227, 'Memory': 2355.9, 'Tool': 'marcie'}, {'Time': 12701, 'Memory': 2355.54, 'Tool': 'marcie'}, {'Time': 3540127, 'Memory': 3528.09, 'Tool': 'lola'}, {'Time': 3540181, 'Memory': 3294.78, 'Tool': 'lola'}].
Learned tools are: [{'Tool': 'gspn'}].
UpperBounds itstools Parking-PT-864...
May 24, 2018 9:13:41 AM fr.lip6.move.gal.application.Application start
INFO: Running its-tools with arguments : [-z3path, /usr/bin/z3, -yices2path, /usr/bin/yices, -ltsminpath, /usr/bin, -smt, -its, -pnfolder, /mcc-data, -examination, UpperBounds]
May 24, 2018 9:13:41 AM fr.lip6.move.gal.application.MccTranslator transformPNML
INFO: Parsing pnml file : /mcc-data/model.pnml
May 24, 2018 9:13:41 AM fr.lip6.move.gal.nupn.PTNetReader loadFromXML
INFO: Load time of PNML (sax parser for PT used): 118 ms
May 24, 2018 9:13:41 AM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 1185 places.
May 24, 2018 9:13:41 AM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 1697 transitions.
May 24, 2018 9:13:41 AM fr.lip6.move.gal.pnml.togal.PnmlToGalTransformer transform
INFO: Found NUPN structural information;
May 24, 2018 9:13:41 AM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /mcc-data/model.pnml.img.gal : 51 ms
May 24, 2018 9:13:41 AM fr.lip6.move.gal.application.MccTranslator applyOrder
INFO: Applying decomposition
May 24, 2018 9:13:42 AM fr.lip6.move.gal.instantiate.CompositeBuilder decomposeWithOrder
INFO: Decomposing Gal with order
May 24, 2018 9:13:42 AM fr.lip6.move.gal.instantiate.GALRewriter flatten
INFO: Flatten gal took : 371 ms
May 24, 2018 9:13:42 AM fr.lip6.move.gal.instantiate.CompositeBuilder rewriteArraysToAllowPartition
INFO: Rewriting arrays to variables to allow decomposition.
May 24, 2018 9:13:42 AM fr.lip6.move.gal.instantiate.Instantiator fuseIsomorphicEffects
INFO: Removed a total of 320 redundant transitions.
May 24, 2018 9:13:42 AM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /mcc-data/UpperBounds.pnml.gal : 15 ms
May 24, 2018 9:13:42 AM fr.lip6.move.serialization.SerializationUtil serializePropertiesForITSTools
INFO: Time to serialize properties into /mcc-data/UpperBounds.prop : 1 ms
Invoking ITS tools like this :CommandLine [args=[/usr/share/itscl/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201804131302/bin/its-reach-linux64, --gc-threshold, 2000000, --quiet, -i, /mcc-data/UpperBounds.pnml.gal, -t, CGAL, -reachable-file, UpperBounds.prop, --nowitness], workingDir=/mcc-data]

its-reach command run as :

/usr/share/itscl/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201804131302/bin/its-reach-linux64 --gc-threshold 2000000 --quiet -i /mcc-data/UpperBounds.pnml.gal -t CGAL -reachable-file UpperBounds.prop --nowitness
Loading property file UpperBounds.prop.
Read [bounds] property : Parking-PT-864-UpperBounds-00 with value :u81.p236
Read [bounds] property : Parking-PT-864-UpperBounds-01 with value :u238.p973
Read [bounds] property : Parking-PT-864-UpperBounds-02 with value :u135.p496
Read [bounds] property : Parking-PT-864-UpperBounds-03 with value :u208.p819
Read [bounds] property : Parking-PT-864-UpperBounds-04 with value :u162.p621
Read [bounds] property : Parking-PT-864-UpperBounds-05 with value :u221.p921
Read [bounds] property : Parking-PT-864-UpperBounds-06 with value :u185.p713
Read [bounds] property : Parking-PT-864-UpperBounds-07 with value :u23.p45
Read [bounds] property : Parking-PT-864-UpperBounds-08 with value :u207.p813
Read [bounds] property : Parking-PT-864-UpperBounds-09 with value :u203.p805
Read [bounds] property : Parking-PT-864-UpperBounds-10 with value :u104.p316
Read [bounds] property : Parking-PT-864-UpperBounds-11 with value :u259.p1078
Read [bounds] property : Parking-PT-864-UpperBounds-12 with value :u204.p807
Read [bounds] property : Parking-PT-864-UpperBounds-13 with value :u135.p503
Read [bounds] property : Parking-PT-864-UpperBounds-14 with value :u135.p482
Read [bounds] property : Parking-PT-864-UpperBounds-15 with value :u108.p372
built 505 ordering constraints for composite.
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking\_PT\_864\_flat\_mod,1.44495e+75,3.92306,103956,1931,107,189640,6630,2605,249266,175,21504,0
Total reachable state count : 1.444950237231026660385402965101406565002e+75

Verifying 16 reachability properties.
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-00 :0 <= u81.p236 <= 1
FORMULA Parking-PT-864-UpperBounds-00 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-00,0,4.3839,103956,1,0,189640,6630,4251,249266,222,21504,38776
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-01 :0 <= u238.p973 <= 1
FORMULA Parking-PT-864-UpperBounds-01 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-01,0,4.93058,104020,1,0,189640,6630,5039,249266,240,21504,40091
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-02 :0 <= u135.p496 <= 1
FORMULA Parking-PT-864-UpperBounds-02 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-02,0,5.36319,104020,1,0,189640,6630,5353,249266,269,21504,40564
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-03 :0 <= u208.p819 <= 1
FORMULA Parking-PT-864-UpperBounds-03 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-03,0,5.74138,104020,1,0,189640,6630,5848,249266,280,21504,40792
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-04 :0 <= u162.p621 <= 1
FORMULA Parking-PT-864-UpperBounds-04 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-04,0,6.1693,104020,1,0,189640,6630,6212,249266,327,21504,41165
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-05 :0 <= u221.p921 <= 1
FORMULA Parking-PT-864-UpperBounds-05 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-05,0,6.55904,104020,1,0,189640,6630,6700,249266,327,21504,41298
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-06 :0 <= u185.p713 <= 1
FORMULA Parking-PT-864-UpperBounds-06 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-06,0,6.97599,104020,1,0,189640,6630,7167,249266,327,21504,41613
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-07 :0 <= u23.p45 <= 1
FORMULA Parking-PT-864-UpperBounds-07 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-07,0,7.40113,104020,1,0,189640,6630,7491,249266,327,21504,42062
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-08 :0 <= u207.p813 <= 1
FORMULA Parking-PT-864-UpperBounds-08 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-08,0,7.78608,104020,1,0,189640,6630,7972,249266,327,21504,42197
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-09 :0 <= u203.p805 <= 1
FORMULA Parking-PT-864-UpperBounds-09 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-09,0,8.23168,104020,1,0,189640,6630,8449,249266,327,21504,42340
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-10 :0 <= u104.p316 <= 1
FORMULA Parking-PT-864-UpperBounds-10 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-10,0,8.67835,104020,1,0,189640,6630,8776,249266,336,21504,42927
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-11 :0 <= u259.p1078 <= 1
FORMULA Parking-PT-864-UpperBounds-11 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-11,0,9.06414,104020,1,0,189640,6630,9302,249266,341,21504,43090
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-12 :0 <= u204.p807 <= 1
FORMULA Parking-PT-864-UpperBounds-12 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-12,0,9.45887,104020,1,0,189640,6630,9780,249266,341,21504,43231
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-13 :0 <= u135.p503 <= 1
FORMULA Parking-PT-864-UpperBounds-13 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-13,0,9.89014,104020,1,0,189640,6630,10094,249266,356,21504,43704
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-14 :0 <= u135.p482 <= 1
FORMULA Parking-PT-864-UpperBounds-14 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-14,0,10.2721,104020,1,0,189640,6630,10408,249266,404,21504,44177
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property Parking-PT-864-UpperBounds-15 :0 <= u108.p372 <= 1
FORMULA Parking-PT-864-UpperBounds-15 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
Parking-PT-864-UpperBounds-15,0,10.6533,104020,1,0,189640,6630,10689,249266,413,21504,44716

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="Parking-PT-864"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="irma4mcc-structural"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"

# 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

tar xzf /home/mcc/BenchKit/INPUTS/Parking-PT-864.tgz
mv Parking-PT-864 execution
cd execution
pwd
ls -lh

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-3637"
echo " Executing tool irma4mcc-structural"
echo " Input is Parking-PT-864, examination is UpperBounds"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r115-csrt-152666474000422"
echo "====================================================================="
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "UpperBounds" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "UpperBounds" != "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 "UpperBounds.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property UpperBounds.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "UpperBounds.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 '' UpperBounds.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
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 ;