Execution Chart

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

Trace from the execution

Formatting '/local/x2003239/mcc2020-input.r194-csrt-159033390400749.qcow2', fmt=qcow2 size=4294967296 backing_file=/local/x2003239/mcc2020-input.qcow2 encryption=off cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.........................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itslola
Input is EGFr-PT-10420, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r194-csrt-159033390400749
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 892K
-rw-r--r-- 1 mcc users 3.6K May 14 00:05 CTLCardinality.txt
-rw-r--r-- 1 mcc users 18K May 14 00:05 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.4K May 13 17:15 CTLFireability.txt
-rw-r--r-- 1 mcc users 22K May 13 17:15 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K May 12 20:53 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 4.2K May 14 10:00 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 14 10:00 LTLCardinality.xml
-rw-r--r-- 1 mcc users 6.6K May 14 10:00 LTLFireability.txt
-rw-r--r-- 1 mcc users 20K May 14 10:00 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.4K May 13 12:48 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K May 13 12:48 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.0K May 13 07:17 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 23K May 13 07:17 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K May 13 16:53 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K May 13 16:53 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 12 20:53 equiv_col
-rw-r--r-- 1 mcc users 6 May 12 20:53 instance
-rw-r--r-- 1 mcc users 6 May 12 20:53 iscolored
-rw-r--r-- 1 mcc users 681K May 12 20:53 model.pnml

--------------------
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 EGFr-PT-10420-UpperBounds-00
FORMULA_NAME EGFr-PT-10420-UpperBounds-01
FORMULA_NAME EGFr-PT-10420-UpperBounds-02
FORMULA_NAME EGFr-PT-10420-UpperBounds-03
FORMULA_NAME EGFr-PT-10420-UpperBounds-04
FORMULA_NAME EGFr-PT-10420-UpperBounds-05
FORMULA_NAME EGFr-PT-10420-UpperBounds-06
FORMULA_NAME EGFr-PT-10420-UpperBounds-07
FORMULA_NAME EGFr-PT-10420-UpperBounds-08
FORMULA_NAME EGFr-PT-10420-UpperBounds-09
FORMULA_NAME EGFr-PT-10420-UpperBounds-10
FORMULA_NAME EGFr-PT-10420-UpperBounds-11
FORMULA_NAME EGFr-PT-10420-UpperBounds-12
FORMULA_NAME EGFr-PT-10420-UpperBounds-13
FORMULA_NAME EGFr-PT-10420-UpperBounds-14
FORMULA_NAME EGFr-PT-10420-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1591239720698

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
[2020-06-04 03:02:03] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, UpperBounds, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -timeout, 3600, -rebuildPNML]
[2020-06-04 03:02:03] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2020-06-04 03:02:03] [INFO ] Load time of PNML (sax parser for PT used): 184 ms
[2020-06-04 03:02:03] [INFO ] Transformed 208 places.
[2020-06-04 03:02:03] [INFO ] Transformed 378 transitions.
[2020-06-04 03:02:03] [INFO ] Found NUPN structural information;
[2020-06-04 03:02:03] [INFO ] Parsed PT model containing 208 places and 378 transitions in 254 ms.
Deduced a syphon composed of 49 places in 3 ms
Reduce places removed 77 places and 239 transitions.
Reduce places removed 21 places and 0 transitions.
Parsed 16 properties from file /home/mcc/execution/UpperBounds.xml in 22 ms.
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
[2020-06-04 03:02:03] [INFO ] Flatten gal took : 54 ms
FORMULA EGFr-PT-10420-UpperBounds-15 0 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-14 0 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-13 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-11 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-10 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-09 0 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-07 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-02 0 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA EGFr-PT-10420-UpperBounds-01 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Finished probabilistic random walk after 0 steps, run visited all 0 properties in 0 ms. (steps per millisecond=0 )
[2020-06-04 03:02:03] [INFO ] Flow matrix only has 106 transitions (discarded 33 similar events)
// Phase 1: matrix 106 rows 110 cols
[2020-06-04 03:02:03] [INFO ] Computed 55 place invariants in 6 ms
Support contains 7 out of 110 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 110/110 places, 139/139 transitions.
Discarding 60 places :
Also discarding 46 output transitions
Drop transitions removed 46 transitions
Graph (complete) has 278 edges and 110 vertex of which 50 are kept as prefixes of interest. Removing 60 places using SCC suffix rule.9 ms
Drop transitions removed 26 transitions
Reduce isomorphic transitions removed 26 transitions.
Iterating post reduction 0 with 26 rules applied. Total rules applied 27 place count 50 transition count 67
Applied a total of 27 rules in 27 ms. Remains 50 /110 variables (removed 60) and now considering 67/139 (removed 72) transitions.
Finished structural reductions, in 1 iterations. Remains : 50/110 places, 67/139 transitions.
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Finished probabilistic random walk after 0 steps, run visited all 0 properties in 0 ms. (steps per millisecond=0 )
[2020-06-04 03:02:03] [INFO ] Flow matrix only has 47 transitions (discarded 20 similar events)
// Phase 1: matrix 47 rows 50 cols
[2020-06-04 03:02:03] [INFO ] Computed 25 place invariants in 4 ms
Support contains 7 out of 50 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 50/50 places, 67/67 transitions.
Applied a total of 0 rules in 8 ms. Remains 50 /50 variables (removed 0) and now considering 67/67 (removed 0) transitions.
Finished structural reductions, in 1 iterations. Remains : 50/50 places, 67/67 transitions.
Starting structural reductions, iteration 0 : 50/50 places, 67/67 transitions.
Applied a total of 0 rules in 6 ms. Remains 50 /50 variables (removed 0) and now considering 67/67 (removed 0) transitions.
[2020-06-04 03:02:03] [INFO ] Flow matrix only has 47 transitions (discarded 20 similar events)
// Phase 1: matrix 47 rows 50 cols
[2020-06-04 03:02:03] [INFO ] Computed 25 place invariants in 1 ms
[2020-06-04 03:02:04] [INFO ] Implicit Places using invariants in 288 ms returned []
[2020-06-04 03:02:04] [INFO ] Flow matrix only has 47 transitions (discarded 20 similar events)
// Phase 1: matrix 47 rows 50 cols
[2020-06-04 03:02:04] [INFO ] Computed 25 place invariants in 1 ms
[2020-06-04 03:02:04] [INFO ] State equation strengthened by 22 read => feed constraints.
[2020-06-04 03:02:04] [INFO ] Implicit Places using invariants and state equation in 138 ms returned []
Implicit Place search using SMT with State Equation took 430 ms to find 0 implicit places.
[2020-06-04 03:02:04] [INFO ] Redundant transitions in 2 ms returned []
[2020-06-04 03:02:04] [INFO ] Flow matrix only has 47 transitions (discarded 20 similar events)
// Phase 1: matrix 47 rows 50 cols
[2020-06-04 03:02:04] [INFO ] Computed 25 place invariants in 1 ms
[2020-06-04 03:02:04] [INFO ] Dead Transitions using invariants and state equation in 318 ms returned []
Finished structural reductions, in 1 iterations. Remains : 50/50 places, 67/67 transitions.
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Graph (trivial) has 53 edges and 50 vertex of which 32 / 50 are part of one of the 16 SCC in 7 ms
Free SCC test removed 16 places
Discarding 22 places :
Also discarding 53 output transitions
Drop transitions removed 53 transitions
Graph (complete) has 15 edges and 34 vertex of which 12 are kept as prefixes of interest. Removing 22 places using SCC suffix rule.0 ms
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 0 with 2 rules applied. Total rules applied 4 place count 12 transition count 12
Applied a total of 4 rules in 10 ms. Remains 12 /50 variables (removed 38) and now considering 12/67 (removed 55) transitions.
// Phase 1: matrix 12 rows 12 cols
[2020-06-04 03:02:04] [INFO ] Computed 6 place invariants in 0 ms
[2020-06-04 03:02:04] [INFO ] Export to MCC properties in file /home/mcc/execution/UpperBounds.sr.xml took 16 ms.
[2020-06-04 03:02:04] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml took 7 ms.
info: Time: 3600 - MCC
vrfy: Checking UpperBounds @ EGFr-PT-10420 @ 3570 seconds

FORMULA EGFr-PT-10420-UpperBounds-00 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-03 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-04 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-05 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-06 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-08 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA EGFr-PT-10420-UpperBounds-12 1 TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
vrfy: finished
info: timeLeft: 3567
rslt: Output for UpperBounds @ EGFr-PT-10420

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"--mcc",
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",
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"files":
{
"formula": "UpperBounds.xml",
"net": "model.pnml"
},
"formula":
{
"skeleton": "MAX(*) : MAX(*) : MAX(*) : MAX(*) : MAX(*) : MAX(*) : MAX(*)"
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"net":
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"preliminary_value": "1 1 1 1 1 1 1 ",
"value": "1 1 1 1 1 1 1 "
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}
lola: LoLA will run for 3570 seconds at most (--timelimit)
lola: NET
lola: input: PNML file (--pnml)
lola: reading net from model.pnml
lola: reading pnml
lola: PNML file contains place/transition net
lola: finished parsing
lola: closed net file model.pnml
lola: 117/268435456 symbol table entries, 0 collisions
lola: preprocessing...
lola: Size of bit vector: 1600
lola: finding significant places
lola: 50 places, 67 transitions, 25 significant places
lola: compute conflict clusters
lola: computed conflict clusters
lola: Computing conflicting sets
lola: Computing back conflicting sets
lola: TASK
lola: Reading formula in XML format (--xmlformula)
lola: reading pnml
lola: reading formula from UpperBounds.xml
lola: MAX(p3) : MAX(p47) : MAX(p2) : MAX(p21) : MAX(p24) : MAX(p1) : MAX(p27)
lola: computing a collection of formulas
lola: RUNNING
lola: subprocess 0 will run for 509 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p3)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p3)
lola: processed formula length: 7
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 2 markings, 1 edges
lola: ========================================
lola: subprocess 1 will run for 594 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p47)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p47)
lola: processed formula length: 8
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 4 markings, 3 edges
lola: ========================================
lola: subprocess 2 will run for 713 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p2)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p2)
lola: processed formula length: 7
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 0 markings, 0 edges
lola: ========================================
lola: subprocess 3 will run for 891 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p21)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p21)
lola: processed formula length: 8
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 10 markings, 9 edges
lola: ========================================
lola: subprocess 4 will run for 1189 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p24)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p24)
lola: processed formula length: 8
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 0 markings, 0 edges
lola: ========================================
lola: subprocess 5 will run for 1783 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p1)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p1)
lola: processed formula length: 7
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 5 markings, 4 edges
lola: ========================================
lola: subprocess 6 will run for 3567 seconds at most (--localtimelimit=0)
lola: ========================================
lola: ...considering subproblem: MAX(p27)
lola: ========================================
lola: SUBTASK
lola: computing bound of an expression
lola: processed formula: MAX(p27)
lola: processed formula length: 8
lola: 0 rewrites
lola: closed formula file UpperBounds.xml
lola: STORE
lola: using a simple compression encoder (--encoder=simplecompressed)
lola: using a prefix tree store (--store=prefix)
lola: SEARCH
lola: using bound preserving stubborn set method with insertion algorithm(--stubborn=tarjan)
lola: RUNNING
lola: Structural Bound: 1
lola: SUBRESULT
lola: result: 1
lola: produced by: state space
lola: The maximum value of the given expression is 1
lola: 9 markings, 8 edges
lola: ========================================
lola: RESULT
lola:
SUMMARY: 1 1 1 1 1 1 1
lola:
preliminary result: 1 1 1 1 1 1 1
lola: memory consumption: 17252 KB
lola: time consumption: 3 seconds
lola: print data as JSON (--json)
lola: writing JSON to UpperBounds.json
lola: closed JSON file UpperBounds.json
rslt: finished

--------------------
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="EGFr-PT-10420"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="itslola"
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

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-4028"
echo " Executing tool itslola"
echo " Input is EGFr-PT-10420, 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 r194-csrt-159033390400749"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/EGFr-PT-10420.tgz
mv EGFr-PT-10420 execution
cd execution
if [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "UpperBounds" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] || [ "UpperBounds" = "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 [ "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
elif [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] ; then
echo "FORMULA_NAME UpperBounds"
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 ;