From e38eea751f55d2e139f3271a73f69d35ff64129b Mon Sep 17 00:00:00 2001 From: jamesandres Date: Wed, 31 Oct 2018 11:39:49 +0000 Subject: [PATCH] Go easier on the CPU when moto sqs is idle For our local development setup we have found that moto is using around 25% CPU constantly. Digging in with gdb it turned out that it was burning that CPU in the sleeping loop. Here i'm increasing the sleep by 10x which brings the idle CPU usage down by 10x (to ~2%). I'm not familiar enough with the moto/sqs codebase to know if lengthening this sleep will have an adverse effect; however, in other Python dev I've noticed that (in Python 2.7 anyway..) Python threading won't context switch a thread until a sleep of at least 0.01 seconds is performed (shockingly long!). So based on this guesswork I suspect sleeping for 0.01 seconds won't cause any grief. --- moto/sqs/models.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/moto/sqs/models.py b/moto/sqs/models.py index f3262a98..1404ded7 100644 --- a/moto/sqs/models.py +++ b/moto/sqs/models.py @@ -534,7 +534,7 @@ class SQSBackend(BaseBackend): break import time - time.sleep(0.001) + time.sleep(0.01) continue previous_result_count = len(result)