aws
[Bug]: memory in manifest is ignored in favor of cpu
Description:
Specifying a 4cpu 8g memory instance in my manifest
environments:
ecs-production:
count: 1
cpu: 4096
memory: 8192
When I exec to the instance, I see 4 cpus and 16g of ram using free -m and htop. It seems like it's using the EC2 standard sizing as a base, not this chart: https://docs.aws.amazon.com/AmazonECS/latest/developerguide/fargate-tasks-services.html#fargate-tasks-size .... or is there a soft limit? Even though the container shows 16g, we only have access to 8g. And are paying for 8g? Thanks.
Hello @chrisschaub. I assume 16g is for all tasks you run in the instance right (and you run 1 task normally)? How often do you see your instance using 16g of ram? I wonder if this is because when you update the service, ECS spins up a new task before deleting the old task.
I log into each instance with svc exec and saw that 16g. There are two tasks ... assuming each is a separate container? The container should be what is provisioned?
On Fri, Apr 12, 2024 at 2:36 PM Penghao He @.***> wrote:
Hello @chrisschaub https://github.com/chrisschaub. I assume 16g is for all tasks you run in the instance right (and you run 1 task normally)? How often do you see your instance using 16g of ram? I wonder if this is because when you update the service, ECS spins up a new task before deleting the old task.
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that's right. if you have two tasks running then 16g mem makes sense to me since 8g mem is supposed to be per task
So does it deploy all tasks to one instance?
On Fri, Apr 12, 2024, 3:26 PM Penghao He @.***> wrote:
that's right. if you have two tasks running then 16g mem makes sense to me since 8g mem is supposed to be per task
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TLDR not necessarily: https://www.youtube.com/watch?v=Vtymod0nPBo&t=545s.
If you use Fargate then the tasks provisioning is all handled by Fargate under the hood and you only pay for the resources you use rather than anything under some specific instance (and the instance is managed by fargate).