diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512y/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512y/output.txt
new file mode 100644
index 0000000000..fc51da0a3b
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512y/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:39 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 35 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> build.512y_m_inl0_hrd0/madevent_cpp
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:46 PM CEST 2024
+ELAPSED: 7 seconds
diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512z/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512z/output.txt
new file mode 100644
index 0000000000..70c0ed00a0
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cpp512z/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:47 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 35 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> build.512z_m_inl0_hrd0/madevent_cpp
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:54 PM CEST 2024
+ELAPSED: 7 seconds
diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppavx2/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppavx2/output.txt
new file mode 100644
index 0000000000..d6e61c44c4
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppavx2/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:31 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 35 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> build.avx2_m_inl0_hrd0/madevent_cpp
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:38 PM CEST 2024
+ELAPSED: 7 seconds
diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppnone/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppnone/output.txt
new file mode 100644
index 0000000000..698e0c92ea
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppnone/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:14 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 35 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> build.none_m_inl0_hrd0/madevent_cpp
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:22 PM CEST 2024
+ELAPSED: 8 seconds
diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppsse4/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppsse4/output.txt
new file mode 100644
index 0000000000..a11b1ce562
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/cppsse4/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:23 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 35 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> build.sse4_m_inl0_hrd0/madevent_cpp
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:30 PM CEST 2024
+ELAPSED: 7 seconds
diff --git a/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/fortran/output.txt b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/fortran/output.txt
new file mode 100644
index 0000000000..72e3f12dc2
--- /dev/null
+++ b/epochX/cudacpp/tlau/fromgridpacks/gg_tt.mad/fortran/output.txt
@@ -0,0 +1,49 @@
+START: Wed Aug  7 02:04:05 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+lrwxrwxrwx. 1 avalassi zg 16 Aug  7 14:04 madevent/SubProcesses/P1_gg_ttx/madevent -> madevent_fortran
+Now generating 10000 events with random seed 21 and granularity 1
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+WRITE GRIDCARD /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/madevent
+generate 10000 events
+P1_gg_ttx
+Using random number seed offset = 21
+INFO: Generating 10000.0 unweighted events. 
+sum of cpu time of last step: 2 seconds
+INFO: need to improve 2 channels 
+combine_events
+store_events
+  === Results Summary for run: GridRun_21 tag: tag_1 ===
+
+     Cross-section :   0 +- 0 pb
+     Nb of events :  10000
+ 
+INFO: No version of lhapdf. Can not run systematics computation 
+decay_events -from_cards
+DONE
+write ./events.lhe.gz
+END: Wed Aug  7 02:04:13 PM CEST 2024
+ELAPSED: 8 seconds
diff --git a/epochX/cudacpp/tlau/gridpacks/.gitignore b/epochX/cudacpp/tlau/gridpacks/.gitignore
new file mode 100644
index 0000000000..30a22396e5
--- /dev/null
+++ b/epochX/cudacpp/tlau/gridpacks/.gitignore
@@ -0,0 +1,2 @@
+madevent
+run.sh
diff --git a/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/output.txt b/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/output.txt
new file mode 100644
index 0000000000..5bd181bdeb
--- /dev/null
+++ b/epochX/cudacpp/tlau/gridpacks/gg_tt.mad/output.txt
@@ -0,0 +1,69 @@
+START: Wed Aug  7 12:35:46 PM CEST 2024
+CUDACPP_RUNTIME_DISABLEFPE is not set
+************************************************************
+*                                                          *
+*                      W E L C O M E to                    *
+*             M A D G R A P H 5 _ a M C @ N L O            *
+*                      M A D E V E N T                     *
+*                                                          *
+*                 *                       *                *
+*                   *        * *        *                  *
+*                     * * * * 5 * * * *                    *
+*                   *        * *        *                  *
+*                 *                       *                *
+*                                                          *
+*         VERSION 3.5.3_lo_vect                            *
+*                                                          *
+*    The MadGraph5_aMC@NLO Development Team - Find us at   *
+*    https://server06.fynu.ucl.ac.be/projects/madgraph     *
+*                                                          *
+*               Type 'help' for in-line help.              *
+*                                                          *
+************************************************************
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/gg_tt.mad/Cards/me5_configuration.txt  
+INFO: load configuration from /data/avalassi/GPU2024/madgraph4gpuX/epochX/cudacpp/gg_tt.mad/Cards/me5_configuration.txt  
+Using default text editor "vi". Set another one in ./input/mg5_configuration.txt
+No valid eps viewer found. Please set in ./input/mg5_configuration.txt
+Using default web browser "firefox". Set another one in ./input/mg5_configuration.txt
+generate_events -f
+Generating gridpack with run name run_01
+survey  run_01 --accuracy=0.01 --points=2000 --iterations=8 --gridpack=.true.
+INFO: compile directory 
+compile Source Directory
+Using random number seed offset = 21
+INFO: Running Survey 
+Creating Jobs
+Working on SubProcesses
+INFO:     P1_gg_ttx  
+Pre-building madevent in madevent_interface.py with ALL matrix elements
+Building madevent in madevent_interface.py with 'fortran' matrix elements
+INFO:  Idle: 1,  Running: 0,  Completed: 0 [ current time: 12h35 ] 
+INFO:  Idle: 0,  Running: 0,  Completed: 1 [  1.8s  ] 
+INFO:  Idle: 0,  Running: 0,  Completed: 1 [  1.8s  ] 
+sum of cpu time of last step: 2 seconds
+  === Results Summary for run: run_01 tag: tag_1 ===
+
+     Cross-section :   442.3 +- 4.036 pb
+     Nb of events :  0
+ 
+INFO: End survey 
+combine_events
+INFO: Combining Events 
+combination of events done in 0.002616405487060547 s 
+store_events
+INFO: Storing parton level results 
+INFO: End Parton 
+decay_events -from_cards
+create_gridpack
+INFO: Creating gridpack 
+P1_gg_ttx
+Cleaning  SubProcesses. 
+INFO: gridpack created 
+quit
+INFO: storing files of previous run 
+INFO: Done 
+INFO:  
+17.17user 2.95system 0:08.06elapsed 249%CPU (0avgtext+0avgdata 91752maxresident)k
+1144inputs+288384outputs (127major+996717minor)pagefaults 0swaps
+END: Wed Aug  7 12:35:55 PM CEST 2024
+ELAPSED: 9 seconds
diff --git a/epochX/cudacpp/tlau/lauX.sh b/epochX/cudacpp/tlau/lauX.sh
index b4bb47155d..594174b643 100755
--- a/epochX/cudacpp/tlau/lauX.sh
+++ b/epochX/cudacpp/tlau/lauX.sh
@@ -10,51 +10,69 @@ scrdir=$(cd $(dirname $0); pwd)
 
 function usage()
 {
-  echo "Usage:   $0 [-<backend> [-nomakeclean]|-ALL] [-rndoff <integer_offset|x10>] <procdir>"
+  echo "Usage:   $0 -<backend> <procdir> [-nomakeclean] [-rndoff <integer_offset|x10>] [-togridpack|-fromgridpack]"
   echo "         (supported <backend> values: fortran, cuda, hip, cppnone, cppsse4, cppavx2, cpp512y, cpp512z)"
+  echo "         (*special* <backend> value: ALL processes all available backends)"
   echo "Example: $0 -cppavx2 gg_tt.mad"
   exit 1
 }
 
 bckend=
 proc=
+grid=
 nomakeclean=
 rndoff=0
 while [ "$1" != "" ]; do
   if [ "$1" == "-fortran" ] || [ "$1" == "-cuda" ] || [ "$1" == "-hip" ] || [ "$1" == "-cppnone" ] || [ "$1" == "-cppsse4" ] || [ "$1" == "-cppavx2" ] || [ "$1" == "-cpp512y" ] || [ "$1" == "-cpp512z" ] || [ "$1" == "-ALL" ]; then
     if [ "${bckend}" == "" ]; then bckend=${1/-/}; else echo "ERROR! Backend already set"; usage; fi
+  elif [ "$1" == "-togridpack" ] && [ "${grid}" == "" ]; then
+    grid=${1}
+  elif [ "$1" == "-fromgridpack" ] && [ "${grid}" == "" ]; then
+    grid=${1}
   elif [ "$1" == "-nomakeclean" ]; then
     nomakeclean=$1
   elif [ "$1" == "-rndoff" ]; then
     rndoff=$2
     shift
+  elif [ "${1#-}" != "${1}" ]; then
+    echo "ERROR! Invalid option '$1'"
+    usage
   elif [ "${proc}" == "" ]; then
     proc=$1
   else
-    echo "ERROR! Invalid option '$1': process directory already set to '${proc}'"
+    echo "ERROR! Invalid input '$1': process directory already set to '${proc}'"
     usage
   fi
   shift
 done
 if [ "${bckend}" == "" ]; then echo "ERROR! No backend was specified"; usage; fi
-if [ "$proc" == "" ]; then echo "ERROR! No process directory was specified"; usage; fi
+if [ "${proc}" == "" ]; then echo "ERROR! No process directory was specified"; usage; fi
+if [ "${grid}" != "" ] && [ "${rndoff}" != "0" ]; then echo "ERROR! ${grid} and -rndoff are not compatible"; exit 1; fi
 
 if [ "${bckend}" == "ALL" ]; then
+  if [ "${grid}" == "-togridpack" ]; then echo "ERROR! ${grid} and -ALL are not compatible"; exit 1; fi # temporary?
   for b in fortran cuda hip cppnone cppsse4 cppavx2 cpp512y cpp512z; do
-    $0 -${b} ${nomakeclean} ${proc} -rndoff ${rndoff}
+    $0 -${b} ${nomakeclean} ${proc} -rndoff ${rndoff} ${grid}
     nomakeclean=-nomakeclean # respect user input only on the first test, then keep the builds
   done
   exit 0 # successful termination on each loop (and skip the rest of this file)
 fi
 
+gridpackdir=${scrdir}/gridpacks/${proc}
 suff=.mad
 if [ "${proc}" == "${proc%${suff}}" ]; then echo "ERROR! Process directory does not end in '${suff}'"; usage; fi
 proc=${proc%${suff}}
-resultsdir=${scrdir}/logs_${proc//_}_${bckend/}
+resultsdir=${scrdir}/logs_${proc//_}_${bckend}
+if [ "${grid}" == "-togridpack" ]; then
+  resultsdir=${gridpackdir}
+elif [ "${grid}" == "-fromgridpack" ]; then
+  resultsdir=${gridpackdir/gridpacks/fromgridpacks}/${bckend}
+  rm -rf ${resultsdir}; mkdir -p ${resultsdir}
+fi
 
 if [ "${rndoff}" == "x10" ]; then
   for i in $(seq 0 9); do
-    $0 -${bckend} ${nomakeclean} ${proc} -rndoff ${i}
+    $0 -${bckend} ${nomakeclean} ${proc} ${grid} -rndoff ${i}
     nomakeclean=-nomakeclean # respect user input only on the first test, then keep the builds
   done
   more ${resultsdir}/*txt | \egrep '(Cross-section :)'
@@ -66,7 +84,6 @@ fi
 
 outfile=output.txt
 if [ "${rndoff}" != "0" ]; then outfile=output${rndoff}.txt; fi
-(( rndseed = 21 + ${rndoff} ))
 
 function exit0()
 {
@@ -88,12 +105,6 @@ elif [ "${bckend}" == "hip" ]; then
   fi
 fi
 
-cd $(dirname $0)/..
-echo "Execute $(basename $0) for process ${proc} and backend ${bckend} in directory $(pwd)"
-procdir=$(pwd)/${proc}${suff}
-if [ ! -d ${procdir} ]; then echo "ERROR! Process directory '${procdir}' does not exist"; usage; fi
-cd ${procdir}
-
 function getnevt()
 {
   if [ "${proc}" == "gg_tt" ]; then
@@ -111,6 +122,58 @@ function getnevt()
   echo $nevt
 }
 
+# Get the random seed
+(( rndseed = 21 + ${rndoff} ))
+
+# Get the number of unweighted events to generate
+nevt=$(getnevt)
+
+# --- OPTION 2: RUN FROM GRIDPACK ---
+if [ "${grid}" == "-fromgridpack" ]; then
+  echo "Execute $(basename $0) for process ${proc} and backend ${bckend} from gridpack directory $(pwd)"
+  if [ ! -d ${gridpackdir} ]; then echo "ERROR! Gridpack directory '${gridpackdir}' does not exist"; usage; fi
+  cd ${gridpackdir}
+  rm -rf madevent run.sh events.lhe*
+  tar -xzf run_01_gridpack.tar.gz
+  # Configure the appropriate backend
+  for dir in madevent/SubProcesses/P*; do
+    pushd $dir >& /dev/null
+    echo "INFO: redefine madevent symlink for backend ${bckend} in ${dir}"
+    if [ "${bckend}" == "fortran" ]; then
+      exe=$(\ls madevent_fortran)
+    else
+      exe=$(\ls build.*${bckend/cpp/}*/madevent_*)
+    fi
+    if [ "$(echo ${exe} | wc -w)" == "0" ]; then
+      echo "ERROR! No madevent executable found for backend $bckend"; exit 1
+    elif [ "$(echo ${exe} | wc -w)" != "1" ]; then
+      echo "ERROR! Too many madevent executables found for backend $bckend:"; echo "$exe"; exit 1
+    fi
+    \rm -f madevent
+    ln -sf $exe madevent
+    popd >& /dev/null
+    echo "----> madevent symlink will now point to $exe"
+  done
+  # Run the test for the appropriate backend
+  START=$(date +%s)
+  echo "START: $(date)" |& tee ${resultsdir}/${outfile}
+  if [ -v CUDACPP_RUNTIME_DISABLEFPE ]; then echo CUDACPP_RUNTIME_DISABLEFPE is set |& tee -a ${resultsdir}/${outfile}; else echo CUDACPP_RUNTIME_DISABLEFPE is not set |& tee -a ${resultsdir}/${outfile}; fi # temporary? (debug FPEs in CMS DY #942)
+  ls -l madevent/SubProcesses/P*/madevent |& tee -a ${resultsdir}/${outfile}
+  ./run.sh ${nevt} ${rndseed} |& tee -a ${resultsdir}/${outfile}
+  mv events* ${resultsdir}
+  echo "END: $(date)" |& tee -a ${resultsdir}/${outfile}
+  END=$(date +%s)
+  echo "ELAPSED: $((END-START)) seconds" |& tee -a ${resultsdir}/${outfile}
+  exit0
+fi
+  
+# --- OPTION 1: RUN FROM SOURCE CODE (AND OPTIONALLY CREATE A GRIDPACK) ---
+cd $(dirname $0)/..
+echo "Execute $(basename $0) for process ${proc} and backend ${bckend} in directory $(pwd)"
+procdir=$(pwd)/${proc}${suff}
+if [ ! -d ${procdir} ]; then echo "ERROR! Process directory '${procdir}' does not exist"; usage; fi
+cd ${procdir}
+
 function lauX_makeclean()
 {
   if [ "${nomakeclean}" == "" ]; then
@@ -127,30 +190,46 @@ function lauX_cleanup()
   rm -f SubProcesses/results.dat
   rm -rf Events HTML; mkdir Events HTML; touch Events/.keep HTML/.keep
   for d in SubProcesses/P*; do cd $d; rm -rf gensym input_app.txt symfact.dat G[0-9]* ajob[0-9]*; cd - > /dev/null; done
+  if [ "${grid}" == "-togridpack" ]; then
+    rm -rf bin/TheChopper-pl
+    rm -rf bin/clean4grid
+    rm -rf bin/compile
+    rm -rf bin/gridrun
+    rm -rf bin/internal/gen_ximprove
+    rm -rf bin/refine4grid
+    rm -rf bin/replace.pl
+    rm -rf bin/run.sh
+  fi
 }
 
 # Clean builds before launch
 lauX_makeclean
 
+# Back up config before launch
+cp SubProcesses/randinit SubProcesses/randinit.BKP # save the initial file
+cp Cards/run_card.dat Cards/run_card.dat.BKP # save the initial file
+cp Cards/grid_card.dat Cards/grid_card.dat.BKP # save the initial file
+cp Source/run_card.inc Source/run_card.inc.BKP # save the initial file
+cp bin/internal/gen_ximprove.py bin/internal/gen_ximprove.py.BKP # save the initial file
+cp bin/internal/madevent_interface.py bin/internal/madevent_interface.py.BKP # save the initial file
+cp Source/make_opts Source/make_opts.BKP # save the initial file
+cp Source/param_card.inc Source/param_card.inc.BKP # save the initial file
+
 # Clean config before launch
+# (NB: "just in case" actions below should normally keep the defaults of generated code in the repo?)
+# (NB: but some small differences have been observed, e.g. "False     = gridpack" vs "False = gridpack")
 if [ "${rndoff}" == "0" ]; then rm -rf ${resultsdir}; mkdir ${resultsdir}; fi
 lauX_cleanup
 rm -f SubProcesses/ME5_debug
-echo "r=21" > SubProcesses/randinit # just in case a previous test was not cleaned up
-cp SubProcesses/randinit SubProcesses/randinit.BKP # save the initial file
+echo "r=21" > SubProcesses/randinit # just in case
 sed -i "s/.* = nevents/  10000 = nevents/" Cards/run_card.dat # just in case
 sed -i "s/.* = cudacpp_backend/ cpp = cudacpp_backend/" Cards/run_card.dat # just in case
 sed -i "s/.* = cudacpp_bldall/ False = cudacpp_bldall/" Cards/run_card.dat # just in case
-cp Cards/run_card.dat Cards/run_card.dat.BKP # save the initial file
+sed -i "s/.* = gridpack/  False = gridpack/" Cards/run_card.dat # just in case
 sed -i "s/      NEVENTS = .*/      NEVENTS = 10000/" Source/run_card.inc # just in case
-cp Source/run_card.inc Source/run_card.inc.BKP # save the initial file
 sed -i "s/8192 1 1/%(event)s         %(maxiter)s           %(miniter)s/" bin/internal/gen_ximprove.py # just in case
-cp bin/internal/gen_ximprove.py bin/internal/gen_ximprove.py.BKP # save the initial file
 sed -i "s/'int', 8192,'Number of points/'int', 1000,'Number of points/" bin/internal/madevent_interface.py # just in case
 sed -i "s/'int', 1, 'Number of iterations'/'int', 5, 'Number of iterations'/" bin/internal/madevent_interface.py # just in case
-cp bin/internal/madevent_interface.py bin/internal/madevent_interface.py.BKP # save the initial file
-cp Source/make_opts Source/make_opts.BKP # save the initial file
-cp Source/param_card.inc Source/param_card.inc.BKP # save the initial file
 
 # Set the random seed
 echo "r=${rndseed}" > SubProcesses/randinit # just in case a previous test was not cleaned up
@@ -163,12 +242,14 @@ sed -i "s/'int', 5, 'Number of iterations'/'int', 1, 'Number of iterations'/" bi
 sed -i "s/%(event)s         %(maxiter)s           %(miniter)s/8192 1 1/" bin/internal/gen_ximprove.py
 
 # Set the number of unweighted events in run_card.dat
-nevt=$(getnevt)
 sed -i "s/ 10000 = nevents/ ${nevt} = nevents/" Cards/run_card.dat
 
 # Set the backend in run_card.dat
 sed -i "s/ cpp = cudacpp_backend/${bckend} = cudacpp_backend/" Cards/run_card.dat
 
+# Set gridpack mode in run_card.dat
+if [ "${grid}" == "-togridpack" ]; then sed -i "s/.* = gridpack/  True = gridpack/" Cards/run_card.dat; fi
+
 # Configure bldall in run_card.dat
 sed -i "s/.* = cudacpp_bldall/ True = cudacpp_bldall/" Cards/run_card.dat
 
@@ -176,7 +257,7 @@ sed -i "s/.* = cudacpp_bldall/ True = cudacpp_bldall/" Cards/run_card.dat
 # (BUG #683: generate_events does not return an error code even if it fails)
 ###set -x # verbose
 START=$(date +%s)
-echo "START: $(date)"  |& tee ${resultsdir}/${outfile}
+echo "START: $(date)" |& tee ${resultsdir}/${outfile}
 if [ -v CUDACPP_RUNTIME_DISABLEFPE ]; then echo CUDACPP_RUNTIME_DISABLEFPE is set |& tee -a ${resultsdir}/${outfile}; else echo CUDACPP_RUNTIME_DISABLEFPE is not set |& tee -a ${resultsdir}/${outfile}; fi # temporary? (debug FPEs in CMS DY #942)
 MG5AMC_CARD_PATH=$(pwd)/Cards time ./bin/generate_events -f |& tee -a ${resultsdir}/${outfile}
 echo "END: $(date)" |& tee -a ${resultsdir}/${outfile}
@@ -184,8 +265,14 @@ END=$(date +%s)
 echo "ELAPSED: $((END-START)) seconds" |& tee -a ${resultsdir}/${outfile}
 ###set +x # not verbose
 
+# Copy output gridpack to tlau/gridpacks directory
+if [ "${grid}" == "-togridpack" ]; then
+  mv run_01_gridpack.tar.gz ${gridpackdir}/run_01_gridpack.tar.gz
+  echo "Gridpack created: ${gridpackdir}/run_01_gridpack.tar.gz"
+fi
+
 # Process and keep results (only for the default rndoff)
-if [ "${rndoff}" == "0" ]; then
+if [ "${grid}" != "-togridpack" ] && [ "${rndoff}" == "0" ]; then
   \rm HTML/results.pkl
   mv Events ${resultsdir}; mv HTML ${resultsdir}
   gunzip ${resultsdir}/Events/run_01/unweighted_events.lhe.gz
@@ -199,6 +286,7 @@ fi
 lauX_cleanup
 mv SubProcesses/randinit.BKP SubProcesses/randinit # restore the initial file
 mv Cards/run_card.dat.BKP Cards/run_card.dat # restore the initial file
+mv Cards/grid_card.dat.BKP Cards/grid_card.dat # restore the initial file
 mv Source/run_card.inc.BKP Source/run_card.inc # restore the initial file
 mv bin/internal/gen_ximprove.py.BKP bin/internal/gen_ximprove.py # restore the initial file
 mv bin/internal/madevent_interface.py.BKP bin/internal/madevent_interface.py # restore the initial file