diff --git a/examples/1D-Array/main_tapioca.cpp b/examples/1D-Array/main_tapioca.cpp
index 8081994cfaaaf94b5527ef388bcb9c4eeb0beb08..8c23b00b971f32b1ec406f0f19fea2fd38a624a9 100644
--- a/examples/1D-Array/main_tapioca.cpp
+++ b/examples/1D-Array/main_tapioca.cpp
@@ -32,7 +32,7 @@ int main (int argc, char * argv[])
   MPI_File file_handle;
   MPI_Status status;
   char output[100];
-  Tapioca tp, tp2;
+  Tapioca tp;
   int64_t chunkCount[1], chunkOffset[1];
   int chunkSize[1];
   
@@ -138,7 +138,7 @@ int main (int argc, char * argv[])
   /*****************/
   /* INIT TAPIOCA  */
   /*****************/
-  tp2.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 1, hdr, ARRAY_OF_STRUCTURES, sub_comm);
+  tp.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 1, hdr, ARRAY_OF_STRUCTURES, sub_comm);
   /*****************/
 
   start_time = MPI_Wtime();
@@ -151,7 +151,7 @@ int main (int argc, char * argv[])
 
   offset = scan_size * particle_size;
 
-  tp2.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
   
   MPI_File_close (&file_handle);
 
diff --git a/examples/HACC-IO/miniHACC-AoS.cpp b/examples/HACC-IO/miniHACC-AoS.cpp
index 3c674b0645973c3620467c6665391eace4f6eda3..1df7b5bca53ff59fbb80d63f71bed46d82821f1a 100644
--- a/examples/HACC-IO/miniHACC-AoS.cpp
+++ b/examples/HACC-IO/miniHACC-AoS.cpp
@@ -24,7 +24,6 @@ int main (int argc, char * argv[])
   MPI_Status status;
   char output[100];
   Tapioca tp;
-  Tapioca tp2;
   int64_t chunkCount[9], chunkOffset[9];
   int chunkSize[9];
   
@@ -202,7 +201,7 @@ int main (int argc, char * argv[])
   /*****************/
   /* INIT TAPIOCA  */
   /*****************/
-  tp2.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 9, hdr, ARRAY_OF_STRUCTURES, sub_comm);
+  tp.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 9, hdr, ARRAY_OF_STRUCTURES, sub_comm);
   /*****************/
 
   start_time = MPI_Wtime();
@@ -215,31 +214,31 @@ int main (int argc, char * argv[])
 
   offset = scan_size * particle_size;
 
-  tp2.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, yy_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, yy_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, zz_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, zz_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, vx_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vx_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, vy_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vy_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, vz_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vz_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, phi_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, phi_r, num_particles, MPI_FLOAT, &status);
   offset += num_particles * sizeof(float);
 
-  tp2.Read (file_handle, offset, pid_r, num_particles, MPI_LONG_LONG, &status);
+  tp.Read (file_handle, offset, pid_r, num_particles, MPI_LONG_LONG, &status);
   offset += num_particles * sizeof(int64_t);
 
-  tp2.Read (file_handle, offset, mask_r, num_particles, MPI_UNSIGNED_SHORT, &status);
+  tp.Read (file_handle, offset, mask_r, num_particles, MPI_UNSIGNED_SHORT, &status);
   
   MPI_File_close (&file_handle);
 
diff --git a/examples/HACC-IO/miniHACC-SoA.cpp b/examples/HACC-IO/miniHACC-SoA.cpp
index 8c33550878ca9d84bac87706b0b89acbef8b6fc2..980c53ed74581394585cee173d2da6fec53ffbc6 100644
--- a/examples/HACC-IO/miniHACC-SoA.cpp
+++ b/examples/HACC-IO/miniHACC-SoA.cpp
@@ -24,7 +24,6 @@ int main (int argc, char * argv[])
   MPI_Status status;
   char output[100];
   Tapioca tp;
-  Tapioca tp2;
   int64_t chunkCount[9], chunkOffset[9];
   int chunkSize[9];
   
@@ -202,7 +201,7 @@ int main (int argc, char * argv[])
   /*****************/
   /* INIT TAPIOCA  */
   /*****************/
-  tp2.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 9, hdr, ARRAY_OF_STRUCTURES, sub_comm);
+  tp.ReadInitialize (output, chunkCount, chunkSize, chunkOffset, 9, hdr, ARRAY_OF_STRUCTURES, sub_comm);
   /*****************/
 
   start_time = MPI_Wtime();
@@ -215,31 +214,31 @@ int main (int argc, char * argv[])
 
   offset = scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, xx_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, yy_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, yy_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, zz_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, zz_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, vx_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vx_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, vy_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vy_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, vz_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, vz_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(float);
 
-  tp2.Read (file_handle, offset, phi_r, num_particles, MPI_FLOAT, &status);
+  tp.Read (file_handle, offset, phi_r, num_particles, MPI_FLOAT, &status);
   offset += (sub_particles - scan_size) * sizeof(float) + scan_size * sizeof(int64_t);
 
-  tp2.Read (file_handle, offset, pid_r, num_particles, MPI_LONG_LONG, &status);
+  tp.Read (file_handle, offset, pid_r, num_particles, MPI_LONG_LONG, &status);
   offset += (sub_particles - scan_size) * sizeof(int64_t) + scan_size * sizeof(uint16_t);
 
-  tp2.Read (file_handle, offset, mask_r, num_particles, MPI_UNSIGNED_SHORT, &status);
+  tp.Read (file_handle, offset, mask_r, num_particles, MPI_UNSIGNED_SHORT, &status);
   
   MPI_File_close (&file_handle);
 
diff --git a/examples/HACC-IO/run_check_bgq.sh b/examples/HACC-IO/run_check_bgq.sh
index 3ceba5b9a5d1152ddcfaff56b50492b3b72ffb0d..90fcb6c5b54533650dbf9973c12b175f9c638223 100755
--- a/examples/HACC-IO/run_check_bgq.sh
+++ b/examples/HACC-IO/run_check_bgq.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-NODES=1024
+NODES=64
 PPN=16
 NPROCS=$((NODES*PPN))
 TARGET="/projects/visualization/ftessier/debug"
@@ -31,7 +31,7 @@ function updateSettings()
     SETTINGS="$SETTINGS BGLOCKLESSMPIO_F_TYPE=0x47504653"
 }
 
-for run in 0 1 2
+for run in 0
 do
     rm $TARGET/*
     updateSettings
diff --git a/tapioca.cpp b/tapioca.cpp
index 72f03798176d0642e709efdaed443ba636d07296..dfc4430072fe82d9b923361f34015c1b28392c4c 100644
--- a/tapioca.cpp
+++ b/tapioca.cpp
@@ -2,8 +2,6 @@
 
 Tapioca::Tapioca ()
 {
-  this->SetDefaultValues ();
-  this->ParseEnvVariables ();
 }
 
 
diff --git a/tp_read.cpp b/tp_read.cpp
index d0a14bb0248071f17ea986a24ce93c7e656ba9d8..1ca0d17563d1919e87e25e844426dea997ea53fa 100644
--- a/tp_read.cpp
+++ b/tp_read.cpp
@@ -8,7 +8,10 @@ void Tapioca::ReadInitialize (char *filename, int64_t *chunkCount, int *chunkSiz
   double startInitTime, endInitTime, startElectTime, endElectTime;
   startInitTime = MPI_Wtime();
 #endif
-  
+
+  this->SetDefaultValues ();
+  this->ParseEnvVariables ();
+
   this->filename_ = filename;
   this->nChunks_ = nChunks;
   this->chunksIndexMatching.resize (this->nChunks_);
diff --git a/tp_write.cpp b/tp_write.cpp
index 6d9fb4a01d07c62df64db20fed701a5dcc5b9c0b..f47d81aabcd6848de06883f934cc626c4ea00596 100644
--- a/tp_write.cpp
+++ b/tp_write.cpp
@@ -8,6 +8,9 @@ void Tapioca::WriteInitialize (char *filename, int64_t *chunkCount, int *chunkSi
   double startInitTime, endInitTime, startElectTime, endElectTime;
   startInitTime = MPI_Wtime();
 #endif
+
+  this->SetDefaultValues ();
+  this->ParseEnvVariables ();
   
   this->filename_ = filename;
   this->nChunks_ = nChunks;