From 31a3d22af433d19fc49113b55b462e13d33c2685 Mon Sep 17 00:00:00 2001
From: tqchen <tianqi.tchen@gmail.com>
Date: Thu, 1 Jan 2015 05:42:38 -0800
Subject: [PATCH] add broadcast

---
 guide/broadcast.cc | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 guide/broadcast.cc

diff --git a/guide/broadcast.cc b/guide/broadcast.cc
new file mode 100644
index 000000000..83dbe67fe
--- /dev/null
+++ b/guide/broadcast.cc
@@ -0,0 +1,16 @@
+#include <rabit.h>
+using namespace rabit;
+const int N = 3;
+int main(int argc, char *argv[]) {
+  rabit::Init(argc, argv);
+  std::string s;
+  if (rabit::GetRank() == 0) s = "hello world";
+  printf("@node[%d] before-broadcast: s=\"%s\"\n",
+         rabit::GetRank(), s.c_str());
+  // broadcast s from node 0 to all other nodes
+  rabit::Broadcast(&s, 0);
+  printf("@node[%d] after-broadcast: s=\"%s\"\n",
+         rabit::GetRank(), s.c_str());
+  rabit::Finalize();
+  return 0;
+}