guohao-rosicky commented on PR #5331:
URL: https://github.com/apache/ozone/pull/5331#issuecomment-1727557479
hi, @sodonnel
I think you are talking about dirty_expire of the filesystem, this threshold
is determined by the kernel parameter, I did a simple test and the result is as
follows:
**test code:**
```java
public static void main(String[] args) throws IOException {
final long filesize = 1024 * 1024 * 1024;
final File file = new File("/Users/rosicky/test/file1.txt");
final File file2 = new File("/Users/rosicky/test/file2.txt");
final FileOutputStream fileOutputStream = new FileOutputStream(file);
final BufferedOutputStream bufferOutputStream =
new BufferedOutputStream(new FileOutputStream(file2), 8 * 1024 *
1024);
final byte[] data = new byte[512];
final long startTime = System.nanoTime();
writeData(fileOutputStream, data, filesize);
long cost1 = System.nanoTime() - startTime;
System.out.println("file output cost: " + cost1 + "ns");
final long startTime2 = System.nanoTime();
writeData(bufferOutputStream, data, filesize);
long cost2 = System.nanoTime() - startTime2;
System.out.println("buffered output cost: " + cost2 + "ns");
}
public static void writeData(OutputStream outputStream, byte[] data,
long filesize)
throws IOException {
for (int i = 0; i < filesize; i += data.length) {
outputStream.write(data);
}
outputStream.close();
}
```
**result:**
```
file output cost: 11646780329ns
buffered output cost: 523351965ns
```
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