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53 lines
1.4 KiB
Markdown
53 lines
1.4 KiB
Markdown
# 1 Billion Row Challenge (1BRC)
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A solution to the [1 Billion Row Challenge](https://www.morling.dev/blog/one-billion-row-challenge/),
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written in [the V programming language](https://vlang.io/).
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Read more about the challenge here: https://www.morling.dev/blog/one-billion-row-challenge/
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## Running instructions
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Suggested compiler options for performance:
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`v -cc gcc -prod -cflags "-std=c17 -march=native -mtune=native" .`
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### Step 1: Create a measurements file
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Compile and run `make-samples` to create the sample file.
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```
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cd make-samples
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v -cc gcc -prod -cflags "-std=c17 -march=native -mtune=native" .
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./make-samples 1000000000 > ~/measurements.txt
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```
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NOTE: If you create a billion rows, the file will be about 12GB!
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### Step 2: Run (and time) the solution
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```
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cd solution
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v -cc gcc -prod -cflags "-std=c17 -march=native -mtune=native" .
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./solution ~/measurements.txt
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```
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You can time the solution using `v time`:
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`v time ./solution ~/measurements.txt`
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By default, the solution runs in a single thread. If you want to run
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parallel processing, use the `-n` parameter, for example, to run with
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8 threads:
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`./solution -n 8 ~/measurements.txt`
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On Linux, to run one thread per core, use
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`./solution -n $(nproc) ~/measurements.txt`
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### Step 3: Improve upon the solution
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Make changes that improve the performance and submit them.
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Let's show off what is possible in V!
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