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Max rps without a signal is unchanged, however we can drastically reduce
memory usage by not creating the signal until needed, and we can
optimize the rps in the case where the signal is created.
With a quick memory benchmark, it looks like this helps pretty
drastically with # of GCs when benchmarking w/wrk:
- 1.42.4: 1763
- canary: 1093
- this patch: 874
This branch:
```
Running 10s test @ http://localhost:8080/
2 threads and 10 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 87.33us 439.95us 20.68ms 99.67%
Req/Sec 66.70k 6.39k 74.11k 83.66%
1340255 requests in 10.10s, 191.73MB read
Requests/sec: 132696.90
Transfer/sec: 18.98MB
cpu: Apple M2 Pro
runtime: deno 1.43.0 (aarch64-apple-darwin)
file:///Users/matt/Documents/scripts/bench_request.js
benchmark time (avg) iter/s (min … max) p75 p99 p995
----------------------------------------------------------------------------------------------- -----------------------------
newRequest 986.5 ns/iter 1,013,682.6 (878.2 ns … 1.18 µs) 1.01 µs 1.18 µs 1.18 µs
newAbortController 18 ns/iter 55,541,104.1 (15.6 ns … 42.62 ns) 17.71 ns 25.05 ns 26.27 ns
newAbortControllerSignal 18.66 ns/iter 53,578,966.7 (16.49 ns … 32.16 ns) 18.71 ns 25.67 ns 26.39 ns
newAbortControllerSignalOnAbort 106.49 ns/iter 9,390,164.9 (97.87 ns … 120.61 ns) 108.6 ns 114.24 ns 115.89 ns
newAbortControllerSignalAddEventListener 86.92 ns/iter 11,504,880.2 (81.88 ns … 103.15 ns) 90 ns 98.28 ns 99.55 ns
newAbortControllerSignalOnAbortNoListener 3.01 µs/iter 331,964.4 (2.97 µs … 3.1 µs) 3.06 µs 3.1 µs 3.1 µs
newAbortControllerSignalOnAbortAbort 3.26 µs/iter 306,662.6 (3.22 µs … 3.36 µs) 3.27 µs 3.36 µs 3.36 µs
```
Latest canary:
```
Running 10s test @ http://localhost:8080/
2 threads and 10 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 72.86us 71.23us 4.47ms 99.05%
Req/Sec 64.66k 5.54k 72.48k 82.18%
1299015 requests in 10.10s, 185.83MB read
Requests/sec: 128616.02
Transfer/sec: 18.40MB
cpu: Apple M2 Pro
runtime: deno 1.43.0+bc4aa5f (aarch64-apple-darwin)
file:///Users/matt/Documents/scripts/bench_request.js
benchmark time (avg) iter/s (min … max) p75 p99 p995
----------------------------------------------------------------------------------------------- -----------------------------
newRequest 1.25 µs/iter 800,005.2 (1.01 µs … 4.18 µs) 1.16 µs 4.18 µs 4.18 µs
newAbortController 18.56 ns/iter 53,868,204.3 (16.04 ns … 38.73 ns) 18.38 ns 26.1 ns 26.63 ns
newAbortControllerSignal 18.72 ns/iter 53,430,746.1 (16.13 ns … 36.71 ns) 18.71 ns 26.19 ns 26.98 ns
newAbortControllerSignalOnAbort 193.91 ns/iter 5,156,992.4 (184.25 ns … 211.41 ns) 194.96 ns 207.87 ns 209.4 ns
newAbortControllerSignalAddEventListener 171.45 ns/iter 5,832,569.2 (153 ns … 182.03 ns) 176.17 ns 180.75 ns 181.05 ns
newAbortControllerSignalOnAbortNoListener 3.07 µs/iter 326,263.3 (2.98 µs … 3.17 µs) 3.08 µs 3.17 µs 3.17 µs
newAbortControllerSignalOnAbortAbort 3.32 µs/iter 301,344.6 (3.29 µs … 3.4 µs) 3.33 µs 3.4 µs 3.4 µs
```
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