WIP: Add another nbody experiment

garlic/exp/nbody/tampi.nix

@@ -0,0 +1,78 @@
+{
+  stdenv
+, stdexp
+, bsc
+, targetMachine
+, stages
+}:
+
+with stdenv.lib;
+
+let
+  # Initial variable configuration
+  varConf = with bsc; {
+    # We need at least cpusPerNode blocks
+    nblocks = [ 32 64 128 256 ];
+  };
+
+  machineConfig = targetMachine.config;
+
+  # Generate the complete configuration for each unit
+  genConf = with bsc; c: targetMachine.config // rec {
+    inherit (machineConfig) hw;
+    # nbody options
+    particles = 1024 * 32;
+    timesteps = 10;
+    inherit (c) nblocks;
+    totalTasks = ntasksPerNode * nodes;
+    particlesPerTask = particles / totalTasks;
+    blocksize = particlesPerTask / nblocks;
+    assert1 = assertMsg (nblocks >= hw.cpusPerSocket)
+      "nblocks too low: ${toString nblocks} < ${toString hw.cpusPerSocket}";
+    assert2 = assertMsg (particlesPerTask >= nblocks)
+      "too few particles: ${toString particlesPerTask} < ${toString nblocks}";
+    cc = icc;
+    mpi = impi;
+    gitBranch = "garlic/tampi+send+oss+task";
+    cflags = "-g";
+
+    # Repeat the execution of each unit 30 times
+    loops = 10;
+
+    # Resources
+    qos = "debug";
+    ntasksPerNode = hw.socketsPerNode;
+    nodes = 1;
+    time = "02:00:00";
+    cpuBind = "sockets,verbose";
+    jobName = "bs-${toString blocksize}-${gitBranch}-nbody";
+  };
+
+  # Compute the array of configurations
+  configs = stdexp.buildConfigs {
+    inherit varConf genConf;
+  };
+
+  perf = {nextStage, conf, ...}: with conf; stages.perf {
+    inherit nextStage;
+    perfOptions = "record --call-graph dwarf -o \\$\\$.perf";
+  };
+
+  exec = {nextStage, conf, ...}: with conf; stages.exec {
+    inherit nextStage;
+    argv = [ "-t" timesteps "-p" particles ];
+  };
+
+  program = {nextStage, conf, ...}: with conf;
+  let
+    customPkgs = stdexp.replaceMpi conf.mpi;
+  in
+    customPkgs.apps.nbody.override {
+      inherit cc blocksize mpi gitBranch cflags;
+    };
+
+  pipeline = stdexp.stdPipeline ++ [ exec program ];
+
+in
+ 
+  stdexp.genExperiment { inherit configs pipeline; }