Java word count

Requirement

• Docker

Build

This will take few minutes to generate a 1GB file.

docker build -t my-jbang-java21-image .

Running

• Counting with plain Linux tools.

docker run --cpus=1 -m 256m --rm my-jbang-java21-image time grep -o 'PEACE' data-file.txt | wc -l

• Counting using java Scanner class.

docker run --cpus=1 -m 256m --rm my-jbang-java21-image java -jar WordCounterScript1-fatjar.jar

• Counting using BufferedReader using a buffer of 1MB.

docker run --cpus=1 -m 256m --rm my-jbang-java21-image java -jar WordCounterScript2-fatjar.jar -b 1

• Counting using BufferedReader using a buffer of 2MB.

docker run --cpus=1 -m 256m --rm my-jbang-java21-image java -jar WordCounterScript2-fatjar.jar -b 2

• Counting using Vertx.

docker run --cpus=1 -m 256m --rm my-jbang-java21-image java -jar WordCounterScript3-fatjar.jar

Notes

• The requirements: 4GB file, 4GB of RAM and 40GB of disk.
• In order to accelerate my manual tests, I'm running the container with a 1GB file, 256MB of RAM and just 1 cpu.
• WordCounterScript2 (BufferedReader) is the fastest implementation.
• WordCounterScript3 (Vertx) is the second.
• WordCounterScript1 (Scanner) is the third.
• All implementations will show the expected result: 100 occurrences of the word 'PEACE', as a token.
• I made use of IntelliJ AI bot.