# solar-server Benchmarks

Comparing a NodeJS REST API using ExpressJS and a file based logging solution against a Pistache REST API using an Sqlite3 logging solution. Measurements are made with Firefox, server is a Raspberry Pi 3 with all content stored on a microsd card (slow!). See the conclusion at the end if you want a TLDR;.

## Raspberry Pi Model 3 B Benchmarks
Iteration #1: Fetching stuff from the database on a day by day basis (1 day = 1 query)

| Operation | NodeJS | Pistache | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | 11ms   | 6ms      | -5ms       |
| Month     | 38ms   | 80ms     | +80ms      |
| Year      | 2122ms | 3353ms   | +1231ms    |

Iteration #2: Fetching stuff from the database in a single query for all requests
+ Index on DateTimeUtc

| Operation | NodeJS | Pistache | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | 12ms   | 16ms     | +4ms       |
| Month     | 40ms   | 127ms    | +87ms      |
| Year      | 1281ms | 6143ms   | +4942ms    |

Iteration #3: Tweaks
+ Index on KilowattHour
+ Reindex

**No difference**

Iteration #4: Split DateTimeUtc into separate TEXT columns

| Operation | NodeJS | Pistache | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | 10ms   | 18ms     | +8ms       |
| Month     | 34ms   | 45ms     | +11ms      |
| Year      | 1151ms | 2110ms   | +959ms     |

## Pentium G5400 Benchmarks

Iteration #5: Hardware change (Raspberry Pi 3+ to Pentium G5400)

| Operation | NodeJS | Pistache | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | -      | 3ms      | -          |
| Month     | -      | 5ms      | -          |
| Year      | -      | 83ms     | -          |

Iteration #6: Keep a separate summary table

| Operation | NodeJS | Pistache | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | -      | 3ms      | -          |
| Month     | -      | 1ms      | -          |
| Year      | -      | 4ms      | -          |

Comparison to the raspberry pi running the same software:

| Operation | RPi    | Pentium  | Difference |
|-----------|-------:|---------:|-----------:|
| Day       | 14ms   | 3ms      | -11ms      |
| Month     | 5ms    | 1ms      | -4ms       |
| Year      | 16ms   | 4ms      | -12ms      |

## Conclusion

Clarification:
- All platforms run Debian Buster
- RPi = Raspbery Pi Model 3 B+
- NodeJS = NodeJS Express.js server serving the solar logs stored as file per day (/var/log/solar/[yyyy]/[mm_dd].txt)
- Pistache = Pistache server serving the solar logs stored in a SQLite3 database

| Operation | RPi NodeJS | RPi Pistache | Pentium G5400 Pistache |
|-----------|-----------:|-------------:|-----------------------:|
| Day       | 11ms       | 14ms         | 3ms                    |
| Month     | 38ms       | 5ms          | 1ms                    |
| Year      | 2122ms     | 16ms         | 4ms                    |