Add __slots__ on objects in jqueue

Adding slots to _QueuedOpCode decreases memory usage (of these objects)
by roughly four times. It is a lesser change for _QueuedJobs.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

diff --git a/lib/jqueue.py b/lib/jqueue.py
index 743870a..7819914 100644 (file)
--- a/lib/jqueue.py
+++ b/lib/jqueue.py
@@ -80,6 +80,10 @@ class _QueuedOpCode(object):
   @ivar stop_timestamp: timestamp for the end of the execution
 
   """
+  __slots__ = ["input", "status", "result", "log",
+               "start_timestamp", "end_timestamp",
+               "__weakref__"]
+
   def __init__(self, op):
     """Constructor for the _QuededOpCode.
 
@@ -152,6 +156,11 @@ class _QueuedJob(object):
   @ivar change: a Condition variable we use for waiting for job changes
 
   """
+  __slots__ = ["queue", "id", "ops", "run_op_index", "log_serial",
+               "received_timestamp", "start_timestamp", "end_timestamp",
+               "change",
+               "__weakref__"]
+
   def __init__(self, queue, job_id, ops):
     """Constructor for the _QueuedJob.