[yilugurlu]

Has anyone ever measured the latency of the sending message to SQS? I was using with ELB in t2.medium instances, and my API (handle => send message to queue => return {status: true}) response times were around 150 - 300 ms and replaced SQS with RabbitMQ, and it went down to around 75-100 ms.

Does anyone think that sending message to SQS is slow?

Edit: With this update, I was able to process almost 3 x requests with the same resources, and it lowered my bills quite a lot.

For example my SQS bill for last month

Amazon Simple Queue Service EUC1-Requests-Tier1 $0.40 per 1,000,000 Amazon SQS Requests per month thereafter 290,659,096 Requests $116.26

it went to 0, and ec2 cost went down as well because ELB spun up fewer instances that I could handle more quest with the same resources.

This was my experience with SQS. I just wanted to share it.

[KirinDave]

In cases where latency is of primary concern, don't use SQS. Consider also not using Rabbit as its tail latency isn't hugely more reliable when loaded.

[Feeble]

Were you running RabbitMQ clustered with persistent queues?

I don't think SQS is primarily for low-latency messaging, but rather a provided high available MQ with very little hassle.

[yilugurlu]

I wasn't, single instance in the same subnet with persistent work queues.

[kondro]

I’m not quite sure why latency affected total throughout.

Although 100-300ms seems pretty good for total round-trip latency to most message queues. Another thing to make sure of is that whatever HTTP client you’re using to interact with AWS is using pipelining. It’s off by default for the JS libraries for example.

[actuator]

Umm.. is this in the same DC?

From what I remember from numbers from New Relic.

- The average SQS Put latency is: 10-20 ms.

- RabbitMQ Publish Message in the same DC should not be more than the round trip time of a DC assuming a persistent connection. So, about 0.5 ms

[avh02]

Benchmarks online show this to be true, depends on your use case if it's acceptable I guess.

[avip]

Sounds more like AZ issue than SQS/rabbit?