About the Execution of LTSMin+red for Anderson-PT-06
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
460.936 | 65662.00 | 111285.00 | 307.90 | 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/mcc2023-input.r535-tall-167987253800012.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 ltsminxred
Input is Anderson-PT-06, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r535-tall-167987253800012
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 764K
-rw-r--r-- 1 mcc users 5.7K Mar 23 15:19 CTLCardinality.txt
-rw-r--r-- 1 mcc users 54K Mar 23 15:19 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.6K Mar 23 15:18 CTLFireability.txt
-rw-r--r-- 1 mcc users 59K Mar 23 15:18 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.7K Mar 23 07:06 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Mar 23 07:06 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.9K Mar 23 07:06 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Mar 23 07:06 LTLFireability.xml
-rw-r--r-- 1 mcc users 1 Mar 26 22:42 NewModel
-rw-r--r-- 1 mcc users 14K Mar 23 15:20 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 137K Mar 23 15:20 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 12K Mar 23 15:19 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 80K Mar 23 15:19 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Mar 23 07:06 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Mar 23 07:06 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 26 22:42 equiv_col
-rw-r--r-- 1 mcc users 3 Mar 26 22:42 instance
-rw-r--r-- 1 mcc users 6 Mar 26 22:42 iscolored
-rw-r--r-- 1 mcc users 302K Mar 31 16:48 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 QuasiLiveness
=== Now, execution of the tool begins
BK_START 1680814761894
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=ltsminxred
BK_EXAMINATION=QuasiLiveness
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=Anderson-PT-06
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202304061127
[2023-04-06 20:59:23] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -timeout, 180, -rebuildPNML]
[2023-04-06 20:59:23] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-04-06 20:59:23] [INFO ] Load time of PNML (sax parser for PT used): 70 ms
[2023-04-06 20:59:23] [INFO ] Transformed 229 places.
[2023-04-06 20:59:23] [INFO ] Transformed 600 transitions.
[2023-04-06 20:59:23] [INFO ] Found NUPN structural information;
[2023-04-06 20:59:23] [INFO ] Parsed PT model containing 229 places and 600 transitions and 2280 arcs in 136 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 229/229 places, 600/600 transitions.
Performed 30 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 0 with 30 Pre rules applied. Total rules applied 0 place count 229 transition count 570
Deduced a syphon composed of 30 places in 1 ms
Reduce places removed 30 places and 0 transitions.
Iterating global reduction 0 with 60 rules applied. Total rules applied 60 place count 199 transition count 570
Applied a total of 60 rules in 28 ms. Remains 199 /229 variables (removed 30) and now considering 570/600 (removed 30) transitions.
// Phase 1: matrix 570 rows 199 cols
[2023-04-06 20:59:23] [INFO ] Computed 15 invariants in 31 ms
[2023-04-06 20:59:24] [INFO ] Implicit Places using invariants in 574 ms returned [0]
Discarding 1 places :
Implicit Place search using SMT only with invariants took 603 ms to find 1 implicit places.
Starting structural reductions in LIVENESS mode, iteration 1 : 198/229 places, 570/600 transitions.
Drop transitions removed 36 transitions
Trivial Post-agglo rules discarded 36 transitions
Performed 36 trivial Post agglomeration. Transition count delta: 36
Iterating post reduction 0 with 36 rules applied. Total rules applied 36 place count 198 transition count 534
Reduce places removed 36 places and 0 transitions.
Iterating post reduction 1 with 36 rules applied. Total rules applied 72 place count 162 transition count 534
Applied a total of 72 rules in 11 ms. Remains 162 /198 variables (removed 36) and now considering 534/570 (removed 36) transitions.
// Phase 1: matrix 534 rows 162 cols
[2023-04-06 20:59:24] [INFO ] Computed 14 invariants in 6 ms
[2023-04-06 20:59:24] [INFO ] Implicit Places using invariants in 280 ms returned []
[2023-04-06 20:59:24] [INFO ] Invariant cache hit.
[2023-04-06 20:59:24] [INFO ] State equation strengthened by 54 read => feed constraints.
[2023-04-06 20:59:25] [INFO ] Implicit Places using invariants and state equation in 655 ms returned []
Implicit Place search using SMT with State Equation took 940 ms to find 0 implicit places.
Starting structural reductions in LIVENESS mode, iteration 2 : 162/229 places, 534/600 transitions.
Finished structural reductions in LIVENESS mode , in 2 iterations and 1585 ms. Remains : 162/229 places, 534/600 transitions.
Initial state reduction rules removed 6 formulas.
Incomplete random walk after 10000 steps, including 2 resets, run finished after 607 ms. (steps per millisecond=16 ) properties (out of 528) seen :395
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 133) seen :0
Running SMT prover for 133 properties.
[2023-04-06 20:59:25] [INFO ] Invariant cache hit.
[2023-04-06 20:59:26] [INFO ] [Real]Absence check using 7 positive place invariants in 3 ms returned sat
[2023-04-06 20:59:26] [INFO ] [Real]Absence check using 7 positive and 7 generalized place invariants in 4 ms returned sat
[2023-04-06 20:59:32] [INFO ] After 5896ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:133
[2023-04-06 20:59:32] [INFO ] [Nat]Absence check using 7 positive place invariants in 17 ms returned sat
[2023-04-06 20:59:32] [INFO ] [Nat]Absence check using 7 positive and 7 generalized place invariants in 5 ms returned sat
[2023-04-06 20:59:38] [INFO ] After 5006ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :133
[2023-04-06 20:59:38] [INFO ] State equation strengthened by 54 read => feed constraints.
[2023-04-06 20:59:42] [INFO ] After 4709ms SMT Verify possible using 54 Read/Feed constraints in natural domain returned unsat :0 sat :133
[2023-04-06 20:59:48] [INFO ] Deduced a trap composed of 76 places in 102 ms of which 5 ms to minimize.
[2023-04-06 20:59:48] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 135 ms
[2023-04-06 20:59:48] [INFO ] After 10763ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :133
Attempting to minimize the solution found.
Minimization took 4672 ms.
[2023-04-06 20:59:53] [INFO ] After 21458ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :133
Parikh walk visited 58 properties in 1484 ms.
Support contains 54 out of 162 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 162/162 places, 534/534 transitions.
Discarding 22 places :
Symmetric choice reduction at 0 with 22 rule applications. Total rules 22 place count 140 transition count 512
Iterating global reduction 0 with 22 rules applied. Total rules applied 44 place count 140 transition count 512
Applied a total of 44 rules in 32 ms. Remains 140 /162 variables (removed 22) and now considering 512/534 (removed 22) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 32 ms. Remains : 140/162 places, 512/534 transitions.
Incomplete random walk after 1000000 steps, including 2 resets, run finished after 24354 ms. (steps per millisecond=41 ) properties (out of 75) seen :58
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 605 ms. (steps per millisecond=165 ) properties (out of 17) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 563 ms. (steps per millisecond=177 ) properties (out of 16) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 614 ms. (steps per millisecond=162 ) properties (out of 15) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 586 ms. (steps per millisecond=170 ) properties (out of 14) seen :1
Incomplete Best-First random walk after 100000 steps, including 2 resets, run finished after 594 ms. (steps per millisecond=168 ) properties (out of 13) seen :1
Incomplete Best-First random walk after 100000 steps, including 2 resets, run finished after 567 ms. (steps per millisecond=176 ) properties (out of 12) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 568 ms. (steps per millisecond=176 ) properties (out of 11) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 542 ms. (steps per millisecond=184 ) properties (out of 10) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 528 ms. (steps per millisecond=189 ) properties (out of 9) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 484 ms. (steps per millisecond=206 ) properties (out of 8) seen :2
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 456 ms. (steps per millisecond=219 ) properties (out of 6) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 438 ms. (steps per millisecond=228 ) properties (out of 5) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 356 ms. (steps per millisecond=280 ) properties (out of 4) seen :1
Incomplete Best-First random walk after 100000 steps, including 2 resets, run finished after 257 ms. (steps per millisecond=389 ) properties (out of 3) seen :1
Incomplete Best-First random walk after 100001 steps, including 2 resets, run finished after 66 ms. (steps per millisecond=1515 ) properties (out of 2) seen :1
Finished Best-First random walk after 3705 steps, including 0 resets, run visited all 1 properties in 3 ms. (steps per millisecond=1235 )
Parikh walk visited 0 properties in 0 ms.
Able to resolve query QuasiLiveness after proving 534 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK PARIKH_WALK BESTFIRST_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 63253 ms.
ITS solved all properties within timeout
BK_STOP 1680814827556
--------------------
content from stderr:
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202304061127.jar
+ VERSION=202304061127
+ echo 'Running Version 202304061127'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination QuasiLiveness -timeout 180 -rebuildPNML
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="Anderson-PT-06"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="ltsminxred"
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 2-5348"
echo " Executing tool ltsminxred"
echo " Input is Anderson-PT-06, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r535-tall-167987253800012"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/Anderson-PT-06.tgz
mv Anderson-PT-06 execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "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 [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "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 "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.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 [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
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 ;