# 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