Add benchmark details (#342)

benchmarks/README.md

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+## Benchmarking
+
+We use K6 to benchmark Parseable. This document contains the results of our benchmarks and steps to run your own benchmarks in your environment to understand Parseable's performance characteristics.
+
+#### Configuration
+
+- Parseable version: `v0.3.0`
+- Server Instance: AWS EC2 `c4.2xlarge` (8 vCPU, 15 GiB RAM). Refer further details [here](https://aws.amazon.com/ec2/instance-types/).
+- Client Instance: AWS EC2 `c4.8xlarge` (36 vCPU, 60 GiB RAM). Refer further details [here](https://aws.amazon.com/ec2/instance-types/).
+
+#### Conclusion
+
+- Parseable is CPU bound. CPU was 100% with lot of memory and disk iops left.
+- Since we had a single client, it needed much more CPU to saturate Parseable. It would be ideal to test with distributed clients. But we expect similar performance from Parseable.
+- Parseable reached `32829.535634/s` in this setup.
+
+#### Detailed Outcome
+
+```bash
+k6 run load.js --vus=700 --duration=5m
+
+          /\      |‾‾| /‾‾/   /‾‾/   
+     /\  /  \     |  |/  /   /  /    
+    /  \/    \    |     (   /   ‾‾\  
+   /          \   |  |\  \ |  (‾)  | 
+  / __________ \  |__| \__\ \_____/ .io
+
+  execution: local
+     script: load.js
+     output: -
+
+  scenarios: (100.00%) 1 scenario, 700 max VUs, 5m30s max duration (incl. graceful stop):
+           * default: 700 looping VUs for 5m0s (gracefulStop: 30s)
+
+
+     data_received..................: 1.5 GB  5.0 MB/s
+     data_sent......................: 8.0 GB  27 MB/s
+     http_req_blocked...............: avg=19.35µs min=0s       med=4.78µs   max=431.69ms p(90)=7.35µs   p(95)=9.81µs  
+     http_req_connecting............: avg=3.79µs  min=0s       med=0s       max=73.48ms  p(90)=0s       p(95)=0s      
+     http_req_duration..............: avg=76.17ms min=344.43µs med=65.01ms  max=636.72ms p(90)=128.99ms p(95)=149.54ms
+       { expected_response:true }...: avg=76.17ms min=344.43µs med=65.01ms  max=636.72ms p(90)=128.99ms p(95)=149.54ms
+     http_req_failed................: 0.00%   ✓ 0            ✗ 9858220
+     http_req_receiving.............: avg=541.7µs min=0s       med=22.49µs  max=218.44ms p(90)=164.95µs p(95)=389.52µs
+     http_req_sending...............: avg=90.17µs min=0s       med=21.07µs  max=485.95ms p(90)=40.19µs  p(95)=146.16µs
+     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
+     http_req_waiting...............: avg=75.54ms min=299.31µs med=64.81ms  max=482.88ms p(90)=127.43ms p(95)=147.69ms
+     http_reqs......................: 9858220 32829.535634/s
+     iteration_duration.............: avg=426.2ms min=195.51ms med=422.99ms max=1.18s    p(90)=499.06ms p(95)=522.91ms
+     iterations.....................: 492911  1641.476782/s
+     vus............................: 700     min=700        max=700  
+     vus_max........................: 700     min=700        max=700  
+
+
+running (5m00.3s), 000/700 VUs, 492911 complete and 0 interrupted iterations
+default ✓ [======================================] 700 VUs  5m0s
+```
+
+#### Grafana Dashboard
+
+![Grafana Dashboard](https://raw.githubusercontent.com/parseablehq/.github/main/images/benchmarks/grafana.png)
+
+NOTE: Benchmarks are nuanced and very much environment specific. So we recommend running benchmarks in the target environment to get an understanding of actual performance.
+
+### Run your own load tests with K6
+
+We have created a [K6](https://k6.io) script to load test a Parseable instance. The script is available [here](https://raw.githubusercontent.com/parseablehq/quest/main/testcases/load.js).
+
+#### Pre-requisites
+
+- [K6](https://k6.io) installed.
+- [Parseable](https://parseable.io) installed and running.
+
+#### Start the script
+
+Make sure to change the env vars as per your setup. Also fine tune `vu` and `duration` as per your needs.
+
+```sh
+export P_URL="https://demo.parseable.io" # Parseable URL
+export P_STREAM="test" # Parseable stream
+export P_USERNAME="admin" # Parseable username
+export P_PASSWORD="admin" # Parseable password
+export P_SCHEMA_COUNT=20 # Number of different types of json formats to be sent to this stream
+k6 run --vus=700 --duration=5m https://raw.githubusercontent.com/parseablehq/quest/main/testcases/load.js
+```
+
+## Elastic
+
+Currently Elastic public benchmarks published here: [https://www.elastic.co/blog/benchmarking-and-sizing-your-elasticsearch-cluster-for-logs-and-metrics](https://www.elastic.co/blog/benchmarking-and-sizing-your-elasticsearch-cluster-for-logs-and-metrics).
+
+As per this benchmark, Elastic is able to ingest 22000 events per second per node. Node specs: 8 vCPU, 32 GiB RAM.