Merge 1074c21 into 9f27280

README.md

@@ -9,15 +9,41 @@ Hermes is a heterogeneous-aware, multi-tiered, dynamic, and distributed I/O buff
 ## Dependencies
 * A C++ compiler that supports C++ 17.
 * [Thallium](https://mochi.readthedocs.io/en/latest/installing.html) - RPC library for HPC. Use a version greater than `0.5` for RoCE support.
-* [GLOG](https://github.com/google/glog) - The Google logging library (`v0.4.0`). (If you install the ORTOOLS binary, GLOG is included).
-* Google ORTOOLS for constraint optimization (tested with `v7.7.7810`).
-  * Download the [OR-Tools binary distribution for C++](https://developers.google.com/optimization/install/cpp).
-  * Setup `ORTOOLS_DIR` as a cmake environment variable.
+* [GLOG](https://github.com/google/glog) - The Google logging library.
+* [GLPK](https://www.gnu.org/software/glpk/) - GNU Linear Programming Kit
 * MPI (tested with MPICH `3.3.2` and OpenMPI `4.0.3`).
 * The [Catch2](https://github.com/catchorg/Catch2) testing framework (only required if built with `-DBUILD_TESTING=ON`)
 
 ## Building
 
+### Spack
+
+[Spack](https://spack.io/) is the easiest way to get Hermes and all its dependencies installed.
+
+```bash
+# Install spack if you don't already have it
+SPACK_DIR=~/spack
+git clone https://github.com/spack/spack ${SPACK_DIR}
+. ${SPACK_DIR}/share/spack/setup-env.sh
+spack install hermes
+```
+
+If this doesn't work, the Hermes and Mochi spack recipes might be out of sync
+with the version of spack you're using. In that case, you can try the most
+up-to-date repos.
+
+```bash
+# set location of hermes_file_staging
+STAGE_DIR=~/hermes_stage
+MOCHI_REPO=${STAGE_DIR}/mochi
+HERMES_REPO=${STAGE_DIR}/hermes
+git clone https://github.com/mochi-hpc/mochi-spack-packages.git ${MOCHI_REPO}
+git clone https://github.com/HDFGroup/hermes ${HERMES_REPO}
+spack repo add ${MOCHI_REPO}
+spack repo add ${HERMES_REPO}/ci/hermes
+spack install hermes
+```
+
 ### CMake
 Hermes makes use of the CMake build system and requires an out of source build.
 
@@ -42,23 +68,6 @@ Type 'c' to configure until there are no errors, then generate the makefile with
 ```
 After the makefile has been generated, you can type `make -j 4` or `cmake --build . -- -j 4`. Add `VERBOSE=1` to see detailed compiler output.
 
-### spack
-```bash
-# set location of current spack to SPACK_DIR or clone it.
-SPACK_DIR=~/spack
-git clone https://github.com/spack/spack ${SPACK_DIR}
-# set location of hermes_file_staging
-STAGE_DIR=~/hermes_stage
-# no change from this point
-MOCHI_REPO=${STAGE_DIR}/mochi
-HERMES_REPO=${STAGE_DIR}/hermes
-git clone https://github.com/mochi-hpc/mochi-spack-packages.git ${MOCHI_REPO}
-git clone https://github.com/HDFGroup/hermes ${HERMES_REPO}
-. ${SPACK_DIR}/share/spack/setup-env.sh
-spack repo add ${MOCHI_REPO}
-spack repo add ${HERMES_REPO}/ci/hermes
-spack install hermes
-```
 
 ### Testing and Installation