BufferedinputStream default buffer size is 8k for my jvm. Is that a harcoded value, or can it be changed by altering some system parameter?
I'd like it to use 128k without modifying the java code. Is that possible?
Thanks,
5
-
1No, there is no system property to change thatK Erlandsson– K Erlandsson2015-06-02 19:25:00 +00:00Commented Jun 2, 2015 at 19:25
-
BufferedInputStream has a constructor where you can set your 128k buffersizeControlAltDel– ControlAltDel2015-06-02 19:25:11 +00:00Commented Jun 2, 2015 at 19:25
-
@KErlandsson Thanks! I was suspecting that, but asked just in case.Younes– Younes2015-06-02 19:27:42 +00:00Commented Jun 2, 2015 at 19:27
-
@ControlAltDel Thanks, but that will cause me to change code!Younes– Younes2015-06-02 19:28:53 +00:00Commented Jun 2, 2015 at 19:28
-
1@RealSkeptic Nice documentation! Not sure how it answers the question!Younes– Younes2015-06-02 19:35:45 +00:00Commented Jun 2, 2015 at 19:35
Add a comment
|
3 Answers
It's not your JVM, but Java defines the default value of 8K for the BufferedInputStream.
You can't change it from outside, without modifying your java program.
To modify from Java, you need to pass the SIZE in Stream constructor.
new BufferedInputStream(file, size * 1024); where size can be 128 for 128KB.
Comments
There is no way to change the default buffer size by a system property. You must use the constructor which accepts a size argument. The only place the buffer is created is in this constructor:
public BufferedInputStream(InputStream in, int size) {
super(in);
if (size <= 0) {
throw new IllegalArgumentException("Buffer size <= 0");
}
buf = new byte[size];
}
This applies for my JVM version (1.8.0_31) but it could possibly be different on other implementations.
Comments
You may use the BufferedInputStream(InputStream in, int size) constructor. But don't change it unless it is very necessary.
