Add OmpSs-2 simple example

ompss2/.gitignore

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+hello
+ovni/

ompss2/Makefile

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+CC=clang
+CFLAGS=-fompss-2
+
+hello: hello.c
+
+trace: hello
+	rm -rf ovni/
+	NOSV_CONFIG_OVERRIDE="instrumentation.version=ovni" NOSV_APPID=1 ./hello
+	ovniemu ovni/
+	ls -l ovni/*.prv
+
+clean:
+	rm -rf hello ovni/

ompss2/README.md

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+# OmpSs-2 environment
+
+This example shows how to include the LLVM compiler to build OmpSs-2 programs
+with the new NODES and nOS-V runtime. The package `clangOmpss2Nodes` already
+sets all the needed variables to locate the right runtime.
+
+Run `nix develop` then `make` to build the `hello` program:
+
+    apex% nix develop
+    apex$ make
+    clang -fompss-2    hello.c   -o hello
+    apex$ ./hello
+    hello from task 1
+    hello from task 0
+    hello from task 2
+    hello from task 3
+    hello from task 4
+    hello from task 7
+    hello from task 8
+    hello from task 6
+    hello from task 9
+    hello from task 5
+
+You can use `make trace` to run the hello program with instrumentation and
+generate an ovni trace that is then converted to paraver:
+
+    apex$ make trace
+    rm -rf ovni/
+    NOSV_CONFIG_OVERRIDE="instrumentation.version=ovni" NOSV_APPID=1 ./hello
+    hello from task 1
+    hello from task 0
+    hello from task 3
+    hello from task 4
+    hello from task 5
+    hello from task 6
+    hello from task 2
+    hello from task 8
+    hello from task 7
+    hello from task 9
+    ovniemu ovni/
+    ovniemu: INFO: loaded 58 streams
+    ovniemu: INFO: sorting looms by name
+    ovniemu: INFO: loaded 1 looms, 1 processes, 58 threads and 56 cpus
+    ovniemu: INFO: generated with libovni version 1.13.0 commit 0643266
+    ovniemu: INFO: the following 2 models are enabled:
+    ovniemu: INFO:      ovni 1.1.0 'O' (18 events)
+    ovniemu: INFO:      nosv 2.6.0 'V' (64 events)
+    ovniemu: INFO: emulation starts
+    ovniemu: INFO: apex.nosv-u1880-p598308 burst stats: median/avg/max =  77/ 81/333 ns
+    ovniemu: WARN: ignoring old event OCn
+    ovniemu: INFO: 100.0% done at avg 42 kev/s
+    ovniemu: INFO: processed 711 input events in 0.02 s
+    ovniemu: INFO: writing traces to disk, please wait
+    ovniemu: INFO: emulation finished ok
+    ls -l ovni/*.prv
+    -rw-r--r-- 1 rarias Computational 48224 Feb  4 11:52 ovni/cpu.prv
+    -rw-r--r-- 1 rarias Computational 33689 Feb  4 11:52 ovni/thread.prv

ompss2/flake.lock

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+{
+  "nodes": {
+    "jungle": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1770128250,
+        "narHash": "sha256-Kx3EwImhYCp4bLPNWGz4oL4IYVjkCLXwcVmXTY40MBc=",
+        "ref": "refs/heads/master",
+        "rev": "7a6e4232de0e181de97e099e600ffc3a964260e0",
+        "revCount": 1536,
+        "type": "git",
+        "url": "https://jungle.bsc.es/git/rarias/jungle"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://jungle.bsc.es/git/rarias/jungle"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1767634882,
+        "narHash": "sha256-2GffSfQxe3sedHzK+sTKlYo/NTIAGzbFCIsNMUPAAnk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3c9db02515ef1d9b6b709fc60ba9a540957f661c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "jungle": "jungle"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

ompss2/flake.nix

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+{
+  inputs.jungle.url = "git+https://jungle.bsc.es/git/rarias/jungle";
+  outputs = { self, jungle }:
+  let
+    nixpkgs = jungle.inputs.nixpkgs;
+    customOverlay = (final: prev: {
+      # Example overlay, for now empty
+    });
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      overlays = [
+        # Apply jungle overlay to get our BSC custom packages
+        jungle.outputs.bscOverlay
+        # And on top apply our local changes to customize for cluster
+        customOverlay
+      ];
+    };
+  in {
+    devShells.x86_64-linux.default = pkgs.mkShell {
+      pname = "ompss2-devshell";
+      # Include these packages in the shell
+      packages = with pkgs; [
+        clangOmpss2Nodes
+        nodes
+        nosv
+        ovni
+        # Optional: Add wxparaver to open .prv traces (needs a working $DISPLAY)
+        # wxparaver
+      ];
+      # The dependencies needed to build these packages will be also included
+      inputsFrom = with pkgs; [
+        
+      ];
+    };
+  };
+}

ompss2/hello.c

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+#include <stdio.h>
+
+int main()
+{
+	for (int i = 0; i < 10; i++) {
+		#pragma oss task
+		printf("hello from task %d\n", i);
+	}
+	return 0;
+}