diff -ruN flash-argonne-20060913/hdf5/flash_benchmark_io.F90 flash-argonne-ornl-updated/hdf5/flash_benchmark_io.F90
--- flash-argonne-20060913/hdf5/flash_benchmark_io.F90	2006-03-15 17:24:18.000000000 -0500
+++ flash-argonne-ornl-updated/hdf5/flash_benchmark_io.F90	2007-07-09 15:14:47.000000000 -0400
@@ -63,6 +63,10 @@
 
 ! setup the file properties
       basenm = "flash_io_test_"
+#ifdef JAGUAR
+#error "change 'basenm' to the correct basename for your file system"
+      basenm = "/tmp/work/wyu/hdf5/flash_io_test_"
+#endif
 
 #ifdef CHIBA
 #error "change 'basenm' to the correct basename for your file system"
diff -ruN flash-argonne-20060913/hdf5/h5_file_interface.c flash-argonne-ornl-updated/hdf5/h5_file_interface.c
--- flash-argonne-20060913/hdf5/h5_file_interface.c	2006-03-15 17:24:18.000000000 -0500
+++ flash-argonne-ornl-updated/hdf5/h5_file_interface.c	2007-07-09 15:18:19.000000000 -0400
@@ -85,6 +85,16 @@
   ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "cb_buffer_size", "4194304");
 #endif
 
+#ifdef JAGUAR
+  ierr = H5Pset_sieve_buf_size(acc_template, 524288); 
+  ierr = H5Pset_alignment(acc_template, 524288, 262144);
+
+  /*ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "cb_nodes", "64");*/
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "romio_cb_write", "ENABLE");
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "romio_cb_read", "ENABLE");
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "cb_buffer_size", "33554432");
+#endif
+
 #ifdef BGL
   /* TODO: what are the good hints for BGL? */
 #endif
diff -ruN flash-argonne-20060913/hdf5/h5_parallel_write.c flash-argonne-ornl-updated/hdf5/h5_parallel_write.c
--- flash-argonne-20060913/hdf5/h5_parallel_write.c	2006-09-07 17:14:39.000000000 -0400
+++ flash-argonne-ornl-updated/hdf5/h5_parallel_write.c	2007-07-09 15:18:41.000000000 -0400
@@ -918,6 +918,11 @@
   ierr = H5Pset_preserve(dxfer_template, 0u);  
 #endif
 
+#ifdef JAGUAR
+  ierr = H5Pset_dxpl_mpio(dxfer_template, H5FD_MPIO_COLLECTIVE);
+  ierr = H5Pset_preserve(dxfer_template, 0u);  
+#endif
+
 #ifdef TFLOPS
   ierr = H5Pset_dxpl_mpio(dxfer_template, H5FD_MPIO_COLLECTIVE);
   ierr = H5Pset_preserve(dxfer_template, 0u);  
diff -ruN flash-argonne-20060913/hdf5/h5_parallel_write_single.c flash-argonne-ornl-updated/hdf5/h5_parallel_write_single.c
--- flash-argonne-20060913/hdf5/h5_parallel_write_single.c	2006-09-07 17:14:39.000000000 -0400
+++ flash-argonne-ornl-updated/hdf5/h5_parallel_write_single.c	2007-07-09 15:19:24.000000000 -0400
@@ -770,6 +770,11 @@
   ierr = H5Pset_preserve(dxfer_template, 0u);  
 #endif
 
+#ifdef JAGUAR
+  ierr = H5Pset_dxpl_mpio(dxfer_template, H5FD_MPIO_COLLECTIVE);
+  ierr = H5Pset_preserve(dxfer_template, 0u);  
+#endif
+
 #ifdef CHIBA
   ierr = H5Pset_dxpl_mpio(dxfer_template, H5FD_MPIO_INDEPENDENT);
   ierr = H5Pset_preserve(dxfer_template, 0u);  
diff -ruN flash-argonne-20060913/hdf5/Makefile.jaguar flash-argonne-ornl-updated/hdf5/Makefile.jaguar
--- flash-argonne-20060913/hdf5/Makefile.jaguar	1969-12-31 19:00:00.000000000 -0500
+++ flash-argonne-ornl-updated/hdf5/Makefile.jaguar	2007-07-09 15:08:08.000000000 -0400
@@ -0,0 +1,60 @@
+# Makefile for the I/O benchmark -- generic linux 
+
+# objects
+OBJS = get_mfluid_property.o \
+       flash_release.o \
+       flash_benchmark_io.o 
+
+OBJS_HDF5_PARALLEL_IO = checkpoint_hdf5_parallel.o \
+                        plotfile_hdf5_parallel.o \
+                        h5_file_interface.o \
+                        h5_parallel_write.o \
+                        h5_parallel_write_single.o
+
+# compiler and linker commands
+FCOMP   = mpif90
+CCOMP   = mpicc
+CPPCOMP = mpicxx
+LINK    = mpif90 
+
+
+# library locations
+HDF5path = /apps/HDF5/1.6.5/xt3_pgi605_par
+ZLIBpath = /apps/zlib/1.2.1/xt3_pgi60
+
+#Usage:   ftn test.f90 ${HDF5_FLIB}
+#    or   cc test.c ${HDF5_CLIB}
+
+# compiler flags
+FFLAGS = -c -fast -r8 -DN_DIM=3 -DMAXBLOCKS=100 -DIONMAX=13 -DJAGUAR
+
+F90FLAGS = 
+
+CFLAGS = -c -I $(HDF5path)/include/ -DN_DIM=3 -DMAXBLOCKS=100 -DIONMAX=13 -DJAGUAR
+
+
+# linker flags
+LFLAGS = -o 
+
+
+
+# libraries to include
+LIB = -L $(HDF5path)/lib -lhdf5 -L$(ZLIBpath)/lib -lz 
+
+.SUFFIXES: .f .F .f90 .F90 .c .C .o
+
+.F90.o :
+	$(FCOMP) $(FFLAGS) $<
+
+.f.o :
+	$(FCOMP) $(FFLAGS) $<
+
+.c.o :
+	$(CCOMP) $(CFLAGS) $<
+
+flash_benchmark_io: $(OBJS) \
+                    $(OBJS_HDF5_PARALLEL_IO) 
+	$(LINK) $(LFLAGS) $@ $(OBJS) $(OBJS_HDF5_PARALLEL_IO) $(LIB)
+
+clean::
+	rm -f *.o flash_benchmark_io
diff -ruN flash-argonne-20060913/README.jaguar flash-argonne-ornl-updated/README.jaguar
--- flash-argonne-20060913/README.jaguar	1969-12-31 19:00:00.000000000 -0500
+++ flash-argonne-ornl-updated/README.jaguar	2007-07-09 15:11:09.000000000 -0400
@@ -0,0 +1,35 @@
+0. Start with flash-argonne-20060913
+   cd flash-argonne-20060913
+
+1. file path editing
+   search for this line in the file: hdf5/flash_benchmark_io.F90
+   Change this path name: /tmp/work/wyu/hdf5, for this line
+      basenm = "/tmp/work/wyu/hdf5/flash_io_test_"
+to
+      basenm = "/tmp/work/oral/hdf5/flash_io_test_"
+   
+2. To run flash IO
+    cd hdf
+    make -f Makefile.jaguar
+    yod -sz 128 ./flash_benchmark_io
+
+3. Efficiency tuning on Lustre striping width and size.
+   Looks the block protected with #ifdef JAGUAR #endif
+   in hdf5/h5_file_interface.c
+
+#ifdef JAGUAR
+  ierr = H5Pset_sieve_buf_size(acc_template, 524288);
+  ierr = H5Pset_alignment(acc_template, 524288, 262144);
+
+  /*ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "cb_nodes", "64");*/
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "romio_cb_write", "ENABLE");
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "romio_cb_read", "ENABLE");
+  ierr = MPI_Info_set(FILE_INFO_TEMPLATE, "cb_buffer_size", "33554432");
+#endif
+
+  2.a) To disable collective buffering, delete the line for romio_cb_write
+  2.b) when collective buffering is on, set the number of IO processes with 
+       the line for "cb_nodes"
+  2.c) when collective buffering is on, adjust the buffer size with
+       the line for "cb_buffer_size"
+  2.d) You may also explore for H5Pset_alignment and H5Pset_sieve_buf_size
+
+4. For questions, send your inquiries to Weikuan Yu (wyu@ornl.gov)