From 6d03b287bc1606424a87d8d9c439b0c011df21ed Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Sun, 27 Sep 2020 08:42:13 -0500
Subject: [PATCH] Adjust MPI boundary comm tag so OpenMPI won't complain

---
 grudge/execution.py         | 3 ---
 grudge/symbolic/compiler.py | 3 +--
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/grudge/execution.py b/grudge/execution.py
index 54f93a63..102fa108 100644
--- a/grudge/execution.py
+++ b/grudge/execution.py
@@ -44,9 +44,6 @@ logger = logging.getLogger(__name__)
 from loopy.version import LOOPY_USE_LANGUAGE_VERSION_2018_2  # noqa: F401
 
 
-MPI_TAG_SEND_TAGS = 1729
-
-
 ResultType = Union[DOFArray, Number]
 
 
diff --git a/grudge/symbolic/compiler.py b/grudge/symbolic/compiler.py
index 075c0b07..85eb4514 100644
--- a/grudge/symbolic/compiler.py
+++ b/grudge/symbolic/compiler.py
@@ -212,8 +212,7 @@ class RankDataSwapAssign(Instruction):
     .. attribute:: dd_out
     .. attribute:: comment
     """
-    # TODO: We need to be sure this does not conflict with some other tag.
-    MPI_TAG_GRUDGE_DATA_BASE = 0x3700d3e
+    MPI_TAG_GRUDGE_DATA_BASE = 15165
 
     def __init__(self, name, field, op):
         self.name = name
-- 
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