From 9bb5f1864f27faca2b172bf6941a53f268847919 Mon Sep 17 00:00:00 2001
From: Augustin Degomme <adegomme@gmail.com>
Date: Thu, 18 Feb 2021 01:12:55 +0100
Subject: [PATCH] debug message for truncation

---
 src/smpi/mpi/smpi_request.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/smpi/mpi/smpi_request.cpp b/src/smpi/mpi/smpi_request.cpp
index 93098dc510..519b0e0abc 100644
--- a/src/smpi/mpi/smpi_request.cpp
+++ b/src/smpi/mpi/smpi_request.cpp
@@ -119,6 +119,7 @@ bool Request::match_common(MPI_Request req, MPI_Request sender, MPI_Request rece
     if (receiver->tag_ == MPI_ANY_TAG)
       receiver->real_tag_ = sender->tag_;
     if (receiver->real_size_ < sender->real_size_){
+      XBT_DEBUG("Truncating message - should not happen: receiver size : %zu < sender size : %zu", receiver->real_size_, sender->real_size_);
       receiver->truncated_ = true;
     }
     if (sender->detached_)
-- 
2.20.1