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--- doku:spack [2021/08/27 08:43] – jz
+++ doku:spack [2023/05/17 14:46] – msiegel
@@ Line 3: / Line 3: @@
 [[https://spack.readthedocs.io/en/latest/basic_usage.html|Official documentation of SPACK]]
-== List available Packages ==
-Most software on VSC4 is installed via spack, to list available software packages use:
+==== New SPACK without environments ====
+Having worked with spack environments for some time, we have encountered several severe issues which have convinced us that we need to find a more practical way of maintaining software packages at VSC.
+There are now three separate spack installation trees corresponding to the CPU/GPU architectures on VSC:
+  * skylake - Intel CPUs; works on Intel Skylake and Cascadelake CPUs
+  * zen - AMD CPUs; works on Zen 2 and 3 CPUs
+  * cuda-zen - AMD CPUs + NVIDIA GPUs; works on all nodes equipped with graphics cards
+By default the spack installation tree suitable for the current compute/login node is activated and will be indicated by a **prefix** on the command line, e.g.:
+<code>
+zen [user@l51 ~]$
+</code>
+Read more at:
+[[doku:spack-transition | Transition to new SPACK without Environments]]
+==== List available packages ====
+Most software on VSC4/5 is installed via spack, to list available software packages use:
 <code>
@@ Line 39: / Line 61: @@
 The latter lists all dependencies of the package.
+**Dependencies**: dependencies of software packages can be specified with a ''^''.
+e.g.:
+<code>
+spack find -lvd py-scipy %intel@19.0.5.281 ^python@3.7.4 ^intel-mkl
+</code>
+This will list all available versions of ''py-scipy'' which have been build with ''python@3.7.4'' and any version of ''intel-mkl''.
+List all currently loaded packages:
+<code>
+spack find --loaded
+</code>
+==== Load modules ====
+The ''spack'' command can be used to load software modules. The general form is:
+<code>
+spack load <package>
+</code>
+''package'' has to be a uniquely defined software package where all dependencies have been resolved, e.g.:
+<code>
+spack load openmpi@4.1.0%gcc@9.1.0
+</code>
+This will load the corresponding module:
+<code>
+# module list
+Currently Loaded Modulefiles:
+) openmpi/4.1.0-gcc-9.1.0-2cmze2s
+</code>
+and is equivalent to loading the module as:
+<code>
+module load openmpi/4.1.0-gcc-9.1.0-2cmze2s
+</code>
+Alternatively a package can be loaded by using the unique hash of a package.
 The option ''-l'' will display the short hash of a package:
@@ Line 55: / Line 117: @@
 </code>
+Unload all currently loaded packages:
 <code>
-spack find -lvd py-scipy %intel@19.0.5.281 ^python@3.7.4 ^intel-mkl
+spack unload --all
 </code>