fond
Model Checking Contest 2018
8th edition, Bratislava, Slovakia, June 26, 2018
Execution of r080-blw3-152649947500137
Last Updated
June 26, 2018

About the Execution of ITS-Tools for Diffusion2D-PT-D05N150

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
15756.070 1065510.00 1071743.00 498.90 TTFTTFFTFFTTTFTT 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 228K
-rw-r--r-- 1 mcc users 3.9K May 15 18:54 CTLCardinality.txt
-rw-r--r-- 1 mcc users 20K May 15 18:54 CTLCardinality.xml
-rw-r--r-- 1 mcc users 2.8K May 15 18:54 CTLFireability.txt
-rw-r--r-- 1 mcc users 16K 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 5.8K May 15 18:50 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 2.4K May 15 18:54 LTLCardinality.txt
-rw-r--r-- 1 mcc users 9.3K May 15 18:54 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.0K May 15 18:54 LTLFireability.txt
-rw-r--r-- 1 mcc users 8.3K May 15 18:54 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.3K May 15 18:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K May 15 18:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 113 May 15 18:54 ReachabilityDeadlock.txt
-rw-r--r-- 1 mcc users 351 May 15 18:54 ReachabilityDeadlock.xml
-rw-r--r-- 1 mcc users 3.9K May 15 18:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 23K May 15 18:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K May 15 18:54 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K 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 8 May 15 18:50 instance
-rw-r--r-- 1 mcc users 6 May 15 18:50 iscolored
-rw-r--r-- 1 mcc users 55K May 15 18:50 model.pnml
=====================================================================
Generated by BenchKit 2-3637
Executing tool itstools
Input is Diffusion2D-PT-D05N150, examination is CTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r080-blw3-152649947500137
=====================================================================


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

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

The expected result is a vector of booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-00
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-01
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-02
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-03
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-04
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-05
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-06
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-07
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-08
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-09
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-10
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-11
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-12
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-13
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-14
FORMULA_NAME Diffusion2D-PT-D05N150-CTLFireability-15

=== Now, execution of the tool begins

BK_START 1527113028883

Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201805151631/bin/its-ctl-linux64, --gc-threshold, 2000000, --quiet, -i, /home/mcc/execution/CTLFireability.pnml.gal, -t, CGAL, -ctl, /home/mcc/execution/CTLFireability.ctl], workingDir=/home/mcc/execution]

its-ctl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201805151631/bin/its-ctl-linux64 --gc-threshold 2000000 --quiet -i /home/mcc/execution/CTLFireability.pnml.gal -t CGAL -ctl /home/mcc/execution/CTLFireability.ctl
No direction supplied, using forward translation only.
Parsed 16 CTL formulae.
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
reachable,1.8126e+29,7.51037,150280,2,3626,5,1.09683e+06,6,0,247,1.08538e+06,0


Converting to forward existential form...Done !
original formula: (AG(EF(!((cAMP__5_2_>=1)))) + ((cAMP__4_1_>=1) * (!(EX((cAMP__2_2_>=1))) + AX(((cAMP__2_4_>=1)||(cAMP__3_4_>=1))))))
=> equivalent forward existential formula: ([((Init * !(!(E(TRUE U !(E(TRUE U !((cAMP__5_2_>=1)))))))) * !((cAMP__4_1_>=1)))] = FALSE * [(EY(((Init * !(!(E(TRUE U !(E(TRUE U !((cAMP__5_2_>=1)))))))) * !(!(EX((cAMP__2_2_>=1)))))) * !(((cAMP__2_4_>=1)||(cAMP__3_4_>=1))))] = FALSE)
Reverse transition relation is exact ! Faster fixpoint algorithm enabled.
(forward)formula 0,1,28.1646,384896,1,0,14,2.14614e+06,20,2,4638,2.09937e+06,9
FORMULA Diffusion2D-PT-D05N150-CTLFireability-00 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: EF(AX((cAMP__5_5_>=1)))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !(EX(!((cAMP__5_5_>=1)))))] != FALSE
(forward)formula 1,1,28.1651,385160,1,0,17,2.14616e+06,22,4,4639,2.09938e+06,11
FORMULA Diffusion2D-PT-D05N150-CTLFireability-01 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: EF(AG((cAMP__3_4_>=1)))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !(E(TRUE U !((cAMP__3_4_>=1)))))] != FALSE
(forward)formula 2,0,35.325,491552,1,0,18,2.30441e+06,24,4,4639,2.21053e+06,14
FORMULA Diffusion2D-PT-D05N150-CTLFireability-02 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: ((AX((((cAMP__2_4_>=1)||(cAMP__4_5_>=1))||(!(cAMP__3_4_>=1)))) + EF(EG((cAMP__1_1_>=1)))) * ((!((cAMP__2_4_>=1)) + !(AX((cAMP__5_3_>=1)))) * E(!((cAMP__5_1_>=1)) U !((cAMP__3_3_>=1)))))
=> equivalent forward existential formula: ([(EY((Init * !(E(TRUE U EG((cAMP__1_1_>=1)))))) * !((((cAMP__2_4_>=1)||(cAMP__4_5_>=1))||(!(cAMP__3_4_>=1)))))] = FALSE * ([((Init * !(!((cAMP__2_4_>=1)))) * !(EX(!((cAMP__5_3_>=1)))))] = FALSE * [(Init * !(E(!((cAMP__5_1_>=1)) U !((cAMP__3_3_>=1)))))] = FALSE))
Hit Full ! (commute/partial/dont) 138/0/6
(forward)formula 3,1,63.58,976204,1,0,29,5.07363e+06,48,8,4726,4.93242e+06,28
FORMULA Diffusion2D-PT-D05N150-CTLFireability-03 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: E(((((cAMP__5_2_>=1)&&(cAMP__3_4_>=1))||(!(cAMP__5_4_>=1)))||(!(cAMP__5_2_>=1))) U ((((cAMP__3_1_>=1)&&(cAMP__2_3_>=1))&&((cAMP__3_5_>=1)&&(cAMP__4_2_>=1)))&&((cAMP__2_1_>=1)||(!(cAMP__3_3_>=1)))))
=> equivalent forward existential formula: [(FwdU(Init,((((cAMP__5_2_>=1)&&(cAMP__3_4_>=1))||(!(cAMP__5_4_>=1)))||(!(cAMP__5_2_>=1)))) * ((((cAMP__3_1_>=1)&&(cAMP__2_3_>=1))&&((cAMP__3_5_>=1)&&(cAMP__4_2_>=1)))&&((cAMP__2_1_>=1)||(!(cAMP__3_3_>=1)))))] != FALSE
Hit Full ! (commute/partial/dont) 108/0/36
(forward)formula 4,1,709.308,7971188,1,0,33,4.9161e+07,56,9,4803,5.18202e+07,32
FORMULA Diffusion2D-PT-D05N150-CTLFireability-04 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: ((EF(AG((cAMP__5_4_>=1))) + (cAMP__3_2_>=1)) + A(((!(cAMP__4_3_>=1))||((cAMP__3_4_>=1)&&(cAMP__3_3_>=1))) U AX((cAMP__1_3_>=1))))
=> equivalent forward existential formula: (([(FwdU(Init,TRUE) * !(E(TRUE U !((cAMP__5_4_>=1)))))] != FALSE + [(Init * (cAMP__3_2_>=1))] != FALSE) + [((Init * !(EG(!(!(EX(!((cAMP__1_3_>=1)))))))) * !(E(!(!(EX(!((cAMP__1_3_>=1))))) U (!(((!(cAMP__4_3_>=1))||((cAMP__3_4_>=1)&&(cAMP__3_3_>=1)))) * !(!(EX(!((cAMP__1_3_>=1)))))))))] != FALSE)
Using saturation style SCC detection
(forward)formula 5,0,1030.88,8051776,1,0,166,4.92838e+07,20,153,4469,5.19081e+07,160
FORMULA Diffusion2D-PT-D05N150-CTLFireability-05 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: EF((AG(((cAMP__3_2_>=1)&&(cAMP__3_1_>=1))) * !(EF((cAMP__4_2_>=1)))))
=> equivalent forward existential formula: [((FwdU(Init,TRUE) * !(E(TRUE U !(((cAMP__3_2_>=1)&&(cAMP__3_1_>=1)))))) * !(E(TRUE U (cAMP__4_2_>=1))))] != FALSE
(forward)formula 6,0,1033.45,8051776,1,0,167,4.92838e+07,21,153,4469,5.19081e+07,163
FORMULA Diffusion2D-PT-D05N150-CTLFireability-06 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: AG(EF((cAMP__2_5_>=1)))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !(E(TRUE U (cAMP__2_5_>=1))))] = FALSE
(forward)formula 7,1,1034.55,8051776,1,0,168,4.92838e+07,22,153,4469,5.19081e+07,166
FORMULA Diffusion2D-PT-D05N150-CTLFireability-07 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: (cAMP__2_4_>=1)
=> equivalent forward existential formula: [(Init * (cAMP__2_4_>=1))] != FALSE
(forward)formula 8,0,1034.55,8051776,1,0,169,4.92838e+07,23,153,4469,5.19081e+07,167
FORMULA Diffusion2D-PT-D05N150-CTLFireability-08 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: (cAMP__3_4_>=1)
=> equivalent forward existential formula: [(Init * (cAMP__3_4_>=1))] != FALSE
(forward)formula 9,0,1034.55,8051776,1,0,170,4.92838e+07,24,153,4469,5.19081e+07,168
FORMULA Diffusion2D-PT-D05N150-CTLFireability-09 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: A((AX((cAMP__3_4_>=1)) * !(((cAMP__2_4_>=1)&&(cAMP__1_4_>=1)))) U (EF((cAMP__3_3_>=1)) + AG((cAMP__4_3_>=1))))
=> equivalent forward existential formula: [((Init * !(EG(!((E(TRUE U (cAMP__3_3_>=1)) + !(E(TRUE U !((cAMP__4_3_>=1))))))))) * !(E(!((E(TRUE U (cAMP__3_3_>=1)) + !(E(TRUE U !((cAMP__4_3_>=1)))))) U (!((!(EX(!((cAMP__3_4_>=1)))) * !(((cAMP__2_4_>=1)&&(cAMP__1_4_>=1))))) * !((E(TRUE U (cAMP__3_3_>=1)) + !(E(TRUE U !((cAMP__4_3_>=1))))))))))] != FALSE
(forward)formula 10,1,1042.74,8051776,1,0,172,4.92838e+07,31,154,4469,5.19081e+07,174
FORMULA Diffusion2D-PT-D05N150-CTLFireability-10 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: !(AX(!(EF((cAMP__2_5_>=1)))))
=> equivalent forward existential formula: [(FwdU(EY(Init),TRUE) * (cAMP__2_5_>=1))] != FALSE
(forward)formula 11,1,1046.38,8051776,1,0,174,4.92838e+07,35,155,4540,5.19081e+07,177
FORMULA Diffusion2D-PT-D05N150-CTLFireability-11 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: (!((cAMP__3_1_>=1)) + (A(((cAMP__1_2_>=1)&&(cAMP__3_5_>=1)) U ((cAMP__3_5_>=1)&&(cAMP__3_4_>=1))) * (cAMP__3_1_>=1)))
=> equivalent forward existential formula: ([(Init * !((cAMP__3_1_>=1)))] != FALSE + [(((Init * (cAMP__3_1_>=1)) * !(EG(!(((cAMP__3_5_>=1)&&(cAMP__3_4_>=1)))))) * !(E(!(((cAMP__3_5_>=1)&&(cAMP__3_4_>=1))) U (!(((cAMP__1_2_>=1)&&(cAMP__3_5_>=1))) * !(((cAMP__3_5_>=1)&&(cAMP__3_4_>=1)))))))] != FALSE)
(forward)formula 12,1,1046.38,8051776,1,0,174,4.92838e+07,37,155,4541,5.19081e+07,178
FORMULA Diffusion2D-PT-D05N150-CTLFireability-12 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: A(((((cAMP__1_5_>=1)||(cAMP__4_1_>=1))&&(cAMP__3_5_>=1))&&(cAMP__2_4_>=1)) U (cAMP__5_3_>=1))
=> equivalent forward existential formula: [((Init * !(EG(!((cAMP__5_3_>=1))))) * !(E(!((cAMP__5_3_>=1)) U (!(((((cAMP__1_5_>=1)||(cAMP__4_1_>=1))&&(cAMP__3_5_>=1))&&(cAMP__2_4_>=1))) * !((cAMP__5_3_>=1))))))] != FALSE
Hit Full ! (commute/partial/dont) 134/0/10
(forward)formula 13,0,1062.04,8051776,1,0,177,4.92838e+07,50,157,4586,5.19081e+07,183
FORMULA Diffusion2D-PT-D05N150-CTLFireability-13 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is FALSE !

***************************************

original formula: EF(EG(AF((cAMP__4_5_>=1))))
=> equivalent forward existential formula: [FwdG(FwdU(Init,TRUE),!(EG(!((cAMP__4_5_>=1)))))] != FALSE
(forward)formula 14,1,1062.38,8051776,1,0,180,4.92838e+07,63,160,4592,5.19081e+07,189
FORMULA Diffusion2D-PT-D05N150-CTLFireability-14 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************

original formula: EF((cAMP__5_4_>=1))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * (cAMP__5_4_>=1))] != FALSE
(forward)formula 15,1,1062.39,8051776,1,0,182,4.92838e+07,64,161,4592,5.19081e+07,190
FORMULA Diffusion2D-PT-D05N150-CTLFireability-15 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Formula is TRUE !

***************************************


BK_STOP 1527114094393

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

+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution CTLFireability -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ /home/mcc/BenchKit//itstools/its-tools -consoleLog -data /home/mcc/execution/workspace -pnfolder /home/mcc/execution -examination CTLFireability -z3path /home/mcc/BenchKit//z3/bin/z3 -yices2path /home/mcc/BenchKit//yices/bin/yices -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=/tmp/.eclipse -Xss8m -Xms40m -Xmx8192m -Dfile.encoding=UTF-8 -Dosgi.requiredJavaVersion=1.6
May 23, 2018 10:03:50 PM fr.lip6.move.gal.application.Application start
INFO: Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLFireability, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -its, -ltsminpath, /home/mcc/BenchKit//lts_install_dir/, -smt]
May 23, 2018 10:03:50 PM fr.lip6.move.gal.application.MccTranslator transformPNML
INFO: Parsing pnml file : /home/mcc/execution/model.pnml
May 23, 2018 10:03:50 PM fr.lip6.move.gal.nupn.PTNetReader loadFromXML
INFO: Load time of PNML (sax parser for PT used): 46 ms
May 23, 2018 10:03:50 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 25 places.
May 23, 2018 10:03:50 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 144 transitions.
May 23, 2018 10:03:50 PM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /home/mcc/execution/model.pnml.img.gal : 9 ms
May 23, 2018 10:03:50 PM fr.lip6.move.gal.instantiate.GALRewriter flatten
INFO: Flatten gal took : 47 ms
May 23, 2018 10:03:50 PM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /home/mcc/execution/CTLFireability.pnml.gal : 3 ms
May 23, 2018 10:03:50 PM fr.lip6.move.serialization.SerializationUtil serializePropertiesForITSCTLTools
INFO: Time to serialize properties into /home/mcc/execution/CTLFireability.ctl : 1 ms

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="Diffusion2D-PT-D05N150"
export BK_EXAMINATION="CTLFireability"
export BK_TOOL="itstools"
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/Diffusion2D-PT-D05N150.tgz
mv Diffusion2D-PT-D05N150 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 itstools"
echo " Input is Diffusion2D-PT-D05N150, examination is CTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r080-blw3-152649947500137"
echo "====================================================================="
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "CTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLFireability" != "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 "CTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLFireability.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 '' CTLFireability.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 ;