Add message sizes to sweeps

tools/run_tests/performance/scenario_config.py

@@ -145,6 +145,10 @@ def _ping_pong_scenario(name, rpc_type,
 
   if unconstrained_client:
     outstanding_calls = outstanding if outstanding is not None else OUTSTANDING_REQUESTS[unconstrained_client]
+    # clamp buffer usage to something reasonable (16 gig for now)
+    MAX_MEMORY_USE = 16 * 1024 * 1024 * 1024
+    if outstanding_calls * max(req_size, resp_size) > MAX_MEMORY_USE:
+        outstanding_calls = max(1, MAX_MEMORY_USE / max(req_size, resp_size))
     wide = channels if channels is not None else WIDE
     deep = int(math.ceil(1.0 * outstanding_calls / wide))
 
@@ -241,6 +245,18 @@ class CXXLanguage:
               async_server_threads=1,
               secure=secure)
 
+          for size in geometric_progression(1, 1024*1024*1024+1, 8):
+              yield _ping_pong_scenario(
+                  'cpp_protobuf_%s_%s_qps_unconstrained_%s_%db' % (synchronicity, rpc_type, secstr, size),
+                  rpc_type=rpc_type.upper(),
+                  req_size=size,
+                  resp_size=size,
+                  client_type='%s_CLIENT' % synchronicity.upper(),
+                  server_type='%s_SERVER' % synchronicity.upper(),
+                  unconstrained_client=synchronicity,
+                  secure=secure,
+                  categories=[SWEEP])
+
           yield _ping_pong_scenario(
               'cpp_protobuf_%s_%s_qps_unconstrained_%s' % (synchronicity, rpc_type, secstr),
               rpc_type=rpc_type.upper(),