diff --git a/tests/2exec/comp2exec b/tests/2exec/comp2exec
index 1c2a50d6..8edfebb2 100755
--- a/tests/2exec/comp2exec
+++ b/tests/2exec/comp2exec
@@ -1,5 +1,5 @@
 #!/bin/bash
-# First parameter is seq (default), mpi, mpi_seq, or ocl_seq.
+# First parameter is seq (default), mpi, mpi_seq, ocl, or ocl_seq. 
 # One-word mode compares corresponding current version with previous stable version (e.g. 1.0)
 # - some differences are always expected.
 # Two-word mode compares two current versions corresponding to different modes (e.g. mpi vs. seq)
@@ -18,27 +18,39 @@ INPUTDIR="./../../input"
 ADDASEQ="./../../src/seq/adda"
 ADDAMPI="./../../src/mpi/adda_mpi"
 ADDAOCL="./../../src/ocl/adda_ocl"
-# Number of mpi procs
-MPIPROCS=2
+# MPI command prefix
+MPIRUN="mpiexec -n 2"
 
 MODE=${1:-seq}
-SUITEFILE=${2:-suite}
+DEFSUITE=suite
+SUITEFILE=${2:-$DEFSUITE}
+
 if [ $MODE == "seq" ]; then
-  EXECREF="./adda_1.0"  # !!! This should be adjusted
+  EXECREF="./adda"  # !!! This should be adjusted
   EXECTEST=$ADDASEQ
   IGERRREF=1
 elif [ $MODE == "mpi" ]; then
-  EXECREF="mpiexec -n $MPIPROCS ./adda_mpi_1.0.exe" # !!! This should be adjusted
-  EXECTEST="mpiexec -n $MPIPROCS $ADDAMPI"
+  EXECREF="$MPIRUN ./adda_mpi" # !!! This should be adjusted
+  EXECTEST="$MPIRUN $ADDAMPI"
   IGERRREF=1
 elif [ $MODE == "mpi_seq" ]; then
   EXECREF=$ADDASEQ
-  EXECTEST="mpiexec -n $MPIPROCS $ADDAMPI"
+  EXECTEST="$MPIRUN $ADDAMPI"
+elif [ $MODE == "ocl" ]; then
+  EXECREF="./adda_ocl_amd" # !!! This should be adjusted
+  EXECTEST=$ADDAOCL
+  IGERRREF=1
 elif [ $MODE == "ocl_seq" ]; then
-  # Currently ocl version can only be compared with the sequential one
   EXECREF=$ADDASEQ
   EXECTEST=$ADDAOCL
+else
+  echo -e "\nERROR: unkwnown mode '$MODE'" >&2
+  exit 1
 fi
+
+# Set the following flag to ignore differences related to different FFT methods, such as FFT grid sizes and memory
+#FFTCOMP=1
+
 # Whether errors in running reference version of ADDA should be ignored. Useful for comparing with 
 # older versions, which lack all the tested functionality. This variable is set above for some 
 # modes.
@@ -100,7 +112,7 @@ function mycmp {
     asmin rtol 2
   elif [ -z "$cmdline" ]; then
     asmin atol 8
-	asmin rtol 3
+    asmin rtol 3
   else
     asmin atol 14
     asmin rtol 8
@@ -108,13 +120,15 @@ function mycmp {
   # behavior is mainly determined by file name
   base=`basename $1`
   if [ "$base" == $SONAME ]; then
-    # 2nd and 3rd parts are due to difference between versions 1.0 and 1.1
-    IGNORE="^all data is saved in '.*'|^box dimensions: [0-9]+x[0-9]+x[0-9]+|^[0-9]+ :  [0-9]+ [0-9]+ [0-9]+ [0-9]+ [0-9]+ "
+    IGNORE="^all data is saved in '.*'"
     if [ $MODE == "mpi_seq" ]; then
       IGNORE="$IGNORE|^(M|Total m|Maximum m|Additional m)emory usage"
     elif [ $MODE == "ocl_seq" ]; then
-      IGNORE="$IGNORE|^Using OpenCL device|^Searching for OpenCL devices|^Initializing (clFFT|FFTW3)|^(M|Total m|OpenCL m)emory usage|^Device memory"  
-	fi
+      IGNORE="$IGNORE|^Using OpenCL device|^Device memory|^Searching for OpenCL devices|^Initializing (clFFT|FFTW3)|^(M|Total m|OpenCL m)emory usage"  
+    fi
+    if [ -n "$FFTCOMP" ]; then
+      IGNORE="$IGNORE|^(M|Total m|OpenCL m)emory usage"
+    fi
     if [[ $MODE == "mpi" || $MODE == "mpi_seq" ]]; then
       CUT="^Error posting writev, " # due to typical random errors of MPICH under Windows
     else
@@ -130,12 +144,14 @@ function mycmp {
     fi
     igndiff $1 $2 "^Usage: '.*'|^Type '.*' for details" "$CUT"
   elif [ "$base" == "log" ]; then
-    # All parts except the first two are due to difference between versions 1.0 and 1.1
-    IGNORE="^Generated by ADDA v\.|^command: '.*'|^WARNING:.*deprecated|^Incident beam: [pP]lane wave|^Polariza(tion|bility) relation: |^Total number of matrix-vector products: "
+    IGNORE="^Generated by ADDA v\.|^command: '.*'"
     if [ $MODE == "mpi_seq" ]; then
       IGNORE="$IGNORE|^The program was run on: |^(M|Total m|Maximum m|Additional m)emory usage"
     elif [ $MODE == "ocl_seq" ]; then
-      IGNORE="$IGNORE|^Using OpenCL device|The FFT grid is: [0-9]+x[0-9]+x[0-9]+||^(M|Total m|OpenCL m)emory usage|^Device memory"  
+      IGNORE="$IGNORE|^Using OpenCL device|^Device memory|^OpenCL FFT algorithm: by |^(M|Total m|OpenCL m)emory usage"  
+    fi
+    if [ -n "$FFTCOMP" ]; then
+      IGNORE="$IGNORE|^(|OpenCL )FFT algorithm: by |The FFT grid is: [0-9]+x[0-9]+x[0-9]+|^(M|Total m|OpenCL m)emory usage"
     fi
     CUT="^Total wall time: "
     asmin rtol 4
@@ -227,7 +243,7 @@ while read -r cmpfiles cmdline; do
     # reference run
     runref="$EXECREF $cmdline -dir $DIRREF"
     if !($runref <&3 > $SOREF); then
-      if $IGNERRREF; then
+      if [ -n "$IGERRREF" ]; then
         refok=0
       else
         echo -e "\nERROR while running \n$runref\nsee $SOREF" >&2
@@ -254,12 +270,12 @@ while read -r cmpfiles cmdline; do
         fi
         for file in $cmpfiles; do
           if [[ "$file" == VisFrp* ]]; then # special case for changed name of output file
-		    file2="${file%.dat}"
-			file2="${file2/VisFrp/RadForce}"
-		  else
-		    file2="$file"
-		  fi
-		  mydiff "$DIRREF/$file" "$DIRTEST/$file2"
+            file2="${file%.dat}"
+            file2="${file2/VisFrp/RadForce}"
+          else
+            file2="$file"
+          fi
+          mydiff "$DIRREF/$file" "$DIRTEST/$file2"
         done
       else
         if [[ "$cmpfiles" == $SONAME || "$cmpfiles" == $ALLNAME ]]; then
diff --git a/tests/2exec/suite b/tests/2exec/suite
index 0f1933b6..e6d6a002 100644
--- a/tests/2exec/suite
+++ b/tests/2exec/suite
@@ -11,6 +11,8 @@
 ;mg4n; ;m; -grid 4 ;n;
 # default addition to make particle completely non-symmetric
 ;sep; ;se; ;p;
+# default for testing of different grids
+;smn; -size 8 ;m; ;n;
 
 # Elementary variables
 ;m; -m 1.1 0.1
@@ -27,8 +29,20 @@
 # directly to ADDA.
 
 all
-# a single relatively long run
-all -grid 32 -size 8 ;m; ;n;
+# testing of different grids - relevant for FFT methods
+# to remove redundant warnings for ocl_seq, only (2,3,5) numbers are used
+all -grid 2 ;smn;
+all -grid 4 ;smn;
+all -grid 6 ;smn;
+all -grid 8 ;smn;
+all -grid 10 ;smn;
+all -grid 12 ;smn;
+all -grid 16 ;smn;
+all -grid 18 ;smn;
+all -grid 20 ;smn;
+all -grid 24 ;smn;
+all -grid 30 ;smn;
+all -grid 32 ;smn;
 
 all -h alldir_inp
 all -alldir_inp adp.dat -Csca ;mgn;