Isolate memory tests in forks

Swing the biggest hammer, run multiprocessing.Process() for
each memusage test individually so that they are fully isolated
from the parent process and any side effects of pytest-xdist

Also add --nomemory as a shortcut to exclude_tags=memory-intensive
and add this to the setup.py test runner as the memory tests
should not be running for quick runs

Change-Id: I3c16c781e21b33deb939a64e77a6e0e41fb86922

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/sqlalchemy/testing/plugin/plugin_base.py b/lib/sqlalchemy/testing/plugin/plugin_base.py
index ab968a379..506a1c922 100644
--- a/lib/sqlalchemy/testing/plugin/plugin_base.py
+++ b/lib/sqlalchemy/testing/plugin/plugin_base.py
@@ -63,6 +63,8 @@ def setup_options(make_option):
                 help="Drop all tables in the target database first")
     make_option("--backend-only", action="store_true", dest="backend_only",
                 help="Run only tests marked with __backend__")
+    make_option("--nomemory", action="store_true", dest="nomemory",
+                help="Don't run memory profiling tests")
     make_option("--low-connections", action="store_true",
                 dest="low_connections",
                 help="Use a low number of distinct connections - "
@@ -229,6 +231,12 @@ def _setup_options(opt, file_config):
 
 
 @pre
+def _set_nomemory(opt, file_config):
+    if opt.nomemory:
+        exclude_tags.add("memory_intensive")
+
+
+@pre
 def _monkeypatch_cdecimal(options, file_config):
     if options.cdecimal:
         import cdecimal