diff --git a/garlic/exp/fwi/common.nix b/garlic/exp/fwi/common.nix
index 5ac38ea..ebaf371 100644
--- a/garlic/exp/fwi/common.nix
+++ b/garlic/exp/fwi/common.nix
@@ -7,17 +7,29 @@
 
 with stdenv.lib;
 
+# Common definitions used by fwi experiments
 rec {
 
-  # We split these into a separate group so we can remove the blocksize
-  # later.
-  forkJoinBranches = [ "garlic/mpi+send+omp+fork" ];
+  branchesWithoutBlocksize = [
+    "garlic/mpi+send+omp+fork"
+    "garlic/mpi+send+seq"
+  ];
 
   # Returns true if the given config is in the forkJoinBranches list
-  isForkJoin = c: any (e: c.gitBranch == e) forkJoinBranches;
+  needsBlocksize = c: ! any (e: c.gitBranch == e) branchesWithoutBlocksize;
 
   # Set the blocksize to null for the fork join branch
-  fixBlocksize = c: if (isForkJoin c) then (c // { blocksize = null; }) else c;
+  fixBlocksize = c: if (needsBlocksize c) then c
+    else (c // { blocksize = null; });
+
+  # Generate the configs by filtering the unneded blocksizes
+  getConfigs = {varConf, genConf}:
+  let
+    allConfigs = stdexp.buildConfigs { inherit varConf genConf; };
+  in
+    # The unique function ensures that we only run one config for the fork
+    # join branch, even if we have multiple blocksizes.
+    unique (map fixBlocksize allConfigs);
 
   exec = {nextStage, conf, ...}: stages.exec {
     inherit nextStage;
@@ -35,7 +47,7 @@ rec {
     argv = [
       "${conf.fwiInput}/fwi_params.txt"
       "${conf.fwiInput}/fwi_frequencies.txt"
-    ] ++ optional (! isForkJoin conf) conf.blocksize ++ [
+    ] ++ optional (needsBlocksize conf) conf.blocksize ++ [
       "-1" # Fordward steps
       "-1" # Backward steps
       conf.ioFreq # Write/read frequency
diff --git a/garlic/exp/fwi/granularity.nix b/garlic/exp/fwi/granularity.nix
index df3ceb2..5b09e5a 100644
--- a/garlic/exp/fwi/granularity.nix
+++ b/garlic/exp/fwi/granularity.nix
@@ -19,21 +19,9 @@ let
 
   # Initial variable configuration
   varConf = {
-    gitBranch = [
-#      "garlic/tampi+send+oss+task"
-      "garlic/tampi+isend+oss+task"
-#      "garlic/mpi+send+omp+task"
-#      "garlic/mpi+send+oss+task"
-#      "garlic/mpi+send+seq"
-#      "garlic/oss+task"
-#      "garlic/omp+task"
-#      "garlic/seq"
-    ];
-
+    gitBranch = [ "garlic/tampi+isend+oss+task" ];
     blocksize = range2 1 256;
-
     n = [ {nx=100; nz=100; ny=8000; ntpn=2; nodes=1;} ];
-
   };
 
   machineConfig = targetMachine.config;
@@ -74,14 +62,13 @@ let
 
   };
 
-  # Compute the array of configurations
-  configs = stdexp.buildConfigs {
-    inherit varConf genConf;
-  };
-
   common = callPackage ./common.nix {};
 
-  inherit (common) fixBlocksize pipeline;
+  inherit (common) getConfigs pipeline;
+
+  configs = getConfigs {
+    inherit varConf genConf;
+  };
 
 in
  
diff --git a/garlic/exp/fwi/ss.nix b/garlic/exp/fwi/ss.nix
index ff8c4ec..25ff81d 100644
--- a/garlic/exp/fwi/ss.nix
+++ b/garlic/exp/fwi/ss.nix
@@ -18,8 +18,6 @@ with garlicTools;
 
 let
 
-  common = callPackage ./common.nix {};
-
   inherit (targetMachine) fs;
 
   # Initial variable configuration
@@ -81,17 +79,14 @@ let
     tempDir = fs.local.temp;
   };
 
-  # Compute the array of configurations
-  allConfigs = stdexp.buildConfigs {
+  common = callPackage ./common.nix {};
+
+  inherit (common) getConfigs pipeline;
+
+  configs = getConfigs {
     inherit varConf genConf;
   };
 
-  # The unique function ensures that we only run one config for the fork
-  # join branch, even if we have multiple blocksizes.
-  configs = unique (map fixBlocksize allConfigs);
-
-  inherit (common) fixBlocksize pipeline;
-
 in
  
   stdexp.genExperiment { inherit configs pipeline; }