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size is set through
H5Pset_fapl_direct. It's been added to H5FD_direct_read in the previous checkin. Still, a test is
needed at later checkin.
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H5Pset_fapl_direct be a structure and passed
through driver info functions in H5FD_direct_open, H5FD_direct_read, and H5FD_direct_write. The
external change is to add a new API function H5Pget_fapl_direct to query 3 control values, the
memory boundary, file system block size, and the maximal buffer size for copying data.
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H5Pset_fapl_direct to control
memory boundary, file block size, and maximal copy buffer size; second in H5FD_direct_write and
H5FD_direct_read, the library checks whether data buffer is aligned. If it is, then write and
read the data directly instead of making a copy buffer.
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Altix (cobalt). There's a configure
option --enable-direct-vfd/--disable-direct-vfd to enable/disable Direct I/O support. The default
is enabled. There's a small test in test/vfd.c. Another way to test it is to set environment
variable HDF5_DRIVER to "direct" and run "make check" in the test/ directory. There'll be some
further improvement in the following checkin including allowing user to provide memory boundary
value, file block size, and copying buffer size.
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