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Cargo.toml

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+[package]
+name = "diesel-bench"
+version = "0.1.0"
+authors = ["Felix Ableitner <me@nutomic.com>"]
+edition = "2018"
+
+[dependencies]
+diesel = { version = "1.4.4", features = ["postgres","chrono","r2d2","64-column-tables","serde_json"] }

README.md

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+diesel-bench
+==
+
+Project to test the effects on compilation time of different diesel features. To use, simply
+adjust the features in `Cargo.toml` and run `bench.sh`. Some results:
+
+|  diesel features | project compilation time | diesel compilation time |
+|---|---|---|
+| ["postgres"] | 31s  |  21s |
+|  ["postgres","64-column-tables"] |  1m 44s | 1m 35s  |
+|  ["postgres","chrono","r2d2","64-column-tables","serde_json"] |  1m 46s |  1m 35s |
+| ["postgres","chrono","r2d2","serde_json"] | 32s | 21s |

bench.sh

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+#!/bin/bash
+set -e
+
+cargo clean
+RUSTC_WRAPPER='' cargo build -Ztimings

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}