Skip to content

Instantly share code, notes, and snippets.

@chanjarster
Created February 21, 2019 07:55
Show Gist options
  • Save chanjarster/b547d443aaf8f141e2d59a4cd01eaeaf to your computer and use it in GitHub Desktop.
Save chanjarster/b547d443aaf8f141e2d59a4cd01eaeaf to your computer and use it in GitHub Desktop.
Writing to stdout vs writing to file
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class ConsolePrint {
private static String line = "very very long line very very long line very very long line very very long line very very long line very very long line very very long line very very long line";
public static void main(String[] args) throws IOException {
int count = Integer.valueOf(args[0]);
long t1 = stdout(count);
long t2 = file(count);
System.out.println("lines: " + String.format("%,d", count));
System.out.println("stdout: " + String.format("%,d", t1) + " ms");
System.out.println("file: " + String.format("%,d", t2) + " ms");
}
private static long stdout(int count) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
System.out.println(line);
}
long end = System.currentTimeMillis();
return end - start;
}
private static long file(int count) throws IOException {
byte[] bytes = line.getBytes();
File tempFile = File.createTempFile("test", "log");
tempFile.deleteOnExit();
try (
FileOutputStream fileOutputStream = new FileOutputStream(tempFile);
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fileOutputStream, 1024 * 64);
) {
long start = System.currentTimeMillis();
for (int i = 0; i < count; i++) {
bufferedOutputStream.write(bytes);
}
bufferedOutputStream.flush();
long end = System.currentTimeMillis();
return end - start;
}
}
}
FROM openjdk:8-alpine
COPY ConsolePrint.java /
RUN javac /ConsolePrint.java
WORKDIR /
ENTRYPOINT ["java", "ConsolePrint"]
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment