Motivation

Following the introduction of Twisted as the HTTP server of LocalStack in an opt-in manner with #9834, we could make it default in the S3 only image, as we know it is way more performant.

Changes

• set GATEWAY_SERVER=twisted in the S3-only Docker image to make it default

Benchmarks

Concurrency of 1, small object size of 1000.

Twisted:   Average: 1.54 MiB/s, 1620.03 obj/s
Hypercorn: Average: 0.21 MiB/s, 219.67 obj/s

-> Around 8x performance

Concurrency of 25, small object size of 1000

Twisted:   Average: 1.78 MiB/s, 1864.04 obj/s
Hypercorn: Average: 0.55 MiB/s, 572.70 obj/s (encountered 9 time out)

Twisted:   Slowest: 1624.7KiB/s, 1663.71 obj/s
Hypercorn: Slowest: 2.7KiB/s, 2.83 obj/s

-> Around 3x performance, but with no massive variations and no errors or blocking operations

Concurrency of 25, medium object size of 100000

Twisted:   Average: 160.13 MiB/s, 1679.13 obj/s
Hypercorn: Average: 52.99 MiB/s, 555.62 obj/s (encountered 8 time out)

Twisted:   Slowest: 153.2MiB/s, 1606.23 obj/s
Hypercorn: Slowest: 301.7KiB/s, 3.09 obj/s

-> Around 3x performance too, but with no massive variations or blocking operations