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[GH-ISSUE #558] [BUG] Execution speed with more worker configured than CPU core for I/O bound tasks #2292

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opened 2026-03-15 19:58:19 +03:00 by kerem · 2 comments

kerem commented

2026-03-15 19:58:19 +03:00

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Originally created by @cs-satish-mishra on GitHub (Oct 14, 2022).
Original GitHub issue: https://github.com/hibiken/asynq/issues/558

Originally assigned to: @hibiken on GitHub.

I am new to go and async, I am coming from the celery background and want to try it.

I have configured my server with 32 concurrent workers on 8 core CPU machine.
I created 5000 tasks from a simple client - the task is an outside HTTP API call to an endpoint that sleeps 3sec and returns a successful response.
Since there is enough task in the Redis I expect 32 tasks to be processed concurrently but looks like only 8-10 are getting processed.

what am I missing here? I am trying a POC to find if it is better performing compared to python celery since most of my tasks are I/O to the external API call

my server configuration
worker := asynq.NewServer(redisConnection, asynq.Config{
// Specify how many concurrent workers to use.
Concurrency: 32,})

Task handler makes an api call as below

client := &http.Client{}
req, err := http.NewRequest(method, url, payload)
res, err := client.Do(req)
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)

Originally created by @cs-satish-mishra on GitHub (Oct 14, 2022). Original GitHub issue: https://github.com/hibiken/asynq/issues/558 Originally assigned to: @hibiken on GitHub. I am new to go and async, I am coming from the celery background and want to try it. I have configured my server with 32 concurrent workers on 8 core CPU machine. I created 5000 tasks from a simple client - the task is an outside HTTP API call to an endpoint that sleeps 3sec and returns a successful response. Since there is enough task in the Redis I expect 32 tasks to be processed concurrently but looks like only 8-10 are getting processed. what am I missing here? I am trying a POC to find if it is better performing compared to python celery since most of my tasks are I/O to the external API call my server configuration worker := asynq.NewServer(redisConnection, asynq.Config{ // Specify how many concurrent workers to use. Concurrency: 32,}) Task handler makes an api call as below client := &http.Client{} req, err := http.NewRequest(method, url, payload) res, err := client.Do(req) defer res.Body.Close() body, err := ioutil.ReadAll(res.Body)

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2026-03-15 19:58:19 +03:00

kerem commented

2026-03-15 19:58:29 +03:00

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@kamikazechaser commented on GitHub (Oct 23, 2022):

Are the 5k tasks loaded immediately before the processor server starts or are both loading and processing done at the same time?

I suggest try loading all 5k first then run the processor.

Also not sure how you are getting the 8-10 tasks? From the Asynqmon UI? I think a better way to test would be to keep track of active connection at the endpoint (I assume this is your endpoint).

@kamikazechaser commented on GitHub (Oct 23, 2022): Are the 5k tasks loaded immediately before the processor server starts or are both loading and processing done at the same time? I suggest try loading all 5k first then run the processor. Also not sure how you are getting the 8-10 tasks? From the Asynqmon UI? I think a better way to test would be to keep track of active connection at the endpoint (I assume this is your endpoint).

kerem commented

2026-03-15 19:58:35 +03:00

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@ioannidesalex commented on GitHub (Jul 8, 2023):

Increase the number of workers to be more than number of cores. I have tested this and found out that for non intensive tasks (e.g. just an HTTP request), it works way faster.

@ioannidesalex commented on GitHub (Jul 8, 2023): Increase the number of workers to be more than number of cores. I have tested this and found out that for non intensive tasks (e.g. just an HTTP request), it works way faster.

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