[mvapich-discuss] [PATCH] Initialize libibverbs’s data structures to handle fork

[Honggang LI]

From: Honggang Li <honli at redhat.com>

The benchmark 'osu_latency_mp.c' uses 'fork()' without calling
ibv_fork_init().

Setting the environment variable RDMAV_FORK_SAFE or
IBV_FORK_SAFE has the same effect as calling ibv_fork_init().

Without this patch, the benchmark hang on when environment
variable not set up.

Signed-off-by: Honggang Li <honli at redhat.com>
---
 mpi/pt2pt/osu_latency_mp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mpi/pt2pt/osu_latency_mp.c b/mpi/pt2pt/osu_latency_mp.c
index 008b1a77de40..ab8b48f95b2e 100644
--- a/mpi/pt2pt/osu_latency_mp.c
+++ b/mpi/pt2pt/osu_latency_mp.c
@@ -26,6 +26,9 @@ int main(int argc, char *argv[])
     options.bench = PT2PT;
     options.subtype = LAT_MP;
 
+    if (putenv("RDMAV_FORK_SAFE=1") != 0)
+	exit(EXIT_FAILURE);
+
     set_header(HEADER);
     set_benchmark_name("osu_latency_mp");
 
-- 
2.25.4