Runtime Environment
To simplify the use of the multiple Lattice QCD cluster
facilities at BNL, FNAL, and JLAB, participants at these different
sites have agreed on a set of common features. Makefiles and scripts
that take advantage of these common features instead of relying on site
specific characteristics will be easier to port. Users who become
familiar with the standard environment should be able to move between
facilities with little difficulty.
Paths and Environment Variables
When operating in the standard environment, you may locate SciDAC
lattice gauge related libraries, binaries, and header files using a
number of environment variables. On the cluster login nodes (for e.g. jpsi1.fnal.govThe facilities currently supported and their
corresponding variable names are:
| Environment
Variable Name |
Value |
| QMP_DIR |
qmp
Installation Directory |
| QLA_DIR |
qla
Installation Directory |
| QIO_DIR |
qio
Installation Directory |
| QDP_DIR |
qdp
Installation Directory |
| MPI_DIR |
mpi
Installation Directory |
| GCC_DIR |
gcc
Installation Directory |
| MILC_DIR |
MILC example Location Directory |
Note that each of these environment variables points to
the top level of the directory structure corresponding to that
facility. To access libraries or headers, append the standard
subdirectory name. For example, your Makefile might include the
following CFLAG
-I $QLA_DIR/include
Building Your Code
For portability, your Makefiles should refer to the
SciDAC libraries and other standard facilities using the environment
variables listed above rather than hard coded paths.
As an example, look in $MILC_DIR for a
working sample of the MILC improved staggered code. In the directory ks_imp_dyn,
there are two Makefiles, Make_linux_qdp and Make_linux_qmp,
which may be used for building the QDP and MPI versions of the code. In
Make_linux_qdp, the standard environment
variables are used to avoid hard coded paths. A few lines from that
Makefile illustrate the usage:
QDP = $(QDP_DIR)
QLA = $(QLA_DIR)
QIO = $(QIO_DIR)
QMP = $(QMP_DIR)
To build your own versions of binaries from this MILC
example, cut and paste
the following lines:
mkdir my_milc_sample
cd my_milc_sample
(cd $MILC_DIR; tar -cf - .) | tar -xf -
cd ks_imp_dyn/
make -f Make_linux_qdp clean
make -f Make_linux_qdp su3_rmd
mv su3_rmd su3_rmd_qdp
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