From 937d75c752b0a4d574b550a53924102a0cff562d Mon Sep 17 00:00:00 2001
From: Anthony Scemama <scemama@irsamc.ups-tlse.fr>
Date: Wed, 17 Oct 2018 18:48:39 +0200
Subject: [PATCH] Broadcasts

---
 INSTALL.md           | 24 ++++++++++++++++++++++++
 Parallel/Parallel.ml |  6 ++++--
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/INSTALL.md b/INSTALL.md
index e3ddcf0..f885fba 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -21,6 +21,14 @@ export  LACAML_LIBS="-L${MKLROOT}/lib/intel64 -Wl,--no-as-needed -lmkl_rt -lpthr
 opam install lacaml
 ```
 
+# MPI
+
+MPI is the Message Passing Interface, required for distributed parallelism.
+
+```bash
+opam install mpi
+```
+
 To use Intel MPI
 
 ```bash
@@ -42,3 +50,19 @@ cd odoc-ltxhtml
 make install
 ```
 
+# Alcotest
+
+Lightweight and colourful test framework
+
+```bash
+opam install alcotest
+```
+
+# Zarith
+
+Implements arithmetic and logical operations over arbitrary-precision integer
+
+```bash
+opam install zarith
+```
+
diff --git a/Parallel/Parallel.ml b/Parallel/Parallel.ml
index d6db9e6..bd3ba17 100644
--- a/Parallel/Parallel.ml
+++ b/Parallel/Parallel.ml
@@ -32,7 +32,8 @@ let broadcast_int x =
 
 
 let broadcast_int_array x =
-  Mpi.broadcast_int_array x 0 Mpi.comm_world
+  Mpi.broadcast_int_array x 0 Mpi.comm_world;
+  x
 
 
 let broadcast_float x =
@@ -40,7 +41,8 @@ let broadcast_float x =
 
 
 let broadcast_float_array x =
-  Mpi.broadcast_float_array x 0 Mpi.comm_world
+  Mpi.broadcast_float_array x 0 Mpi.comm_world;
+  x
 
 
 let broadcast_vec x =