From a2bc12da685529112888743b734f41ea10d539ce Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Tue, 26 Dec 2017 21:13:46 +0000
Subject: [PATCH] Only print gateware/software mismatch warning once per
 process.

---
 artiq/coredevice/comm_kernel.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/artiq/coredevice/comm_kernel.py b/artiq/coredevice/comm_kernel.py
index 2731ffd4d..2a2a7f560 100644
--- a/artiq/coredevice/comm_kernel.py
+++ b/artiq/coredevice/comm_kernel.py
@@ -136,6 +136,8 @@ class CommKernelDummy:
 
 
 class CommKernel:
+    warned_of_mismatch = False
+
     def __init__(self, host, port=1381):
         self._read_type = None
         self.host = host
@@ -284,10 +286,11 @@ class CommKernel:
                                     .format(runtime_id))
 
         gateware_version = self._read_string()
-        if gateware_version != software_version:
+        if gateware_version != software_version and not self.warned_of_mismatch:
             logger.warning("Mismatch between gateware (%s) "
                            "and software (%s) versions",
                            gateware_version, software_version)
+            CommKernel.warned_of_mismatch = True
 
         finished_cleanly = self._read_bool()
         if not finished_cleanly: