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Groups > comp.lang.java.programmer > #28445

Re: byte stream vs char stream buffer

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On Sun, 11 May 2014 09:05:16 +0000 (UTC), Martin Gregorie
<martin@address-in-sig.invalid> wrote, quoted or indirectly quoted
someone who said :

>
>Instead the BufferedInputStream  is getting part of a 'buffer space 
>allocation', which is set to 32K. This part varies from 10% to 90% of the 
>32K while the BufferedReader always gets 16K.


    private static void withBufferedReader( double ratio, int buffsize
) throws IOException
        {
        assert .1 <= ratio && ratio <= .9 : "ratio must be in range
[0.1,0.9].";
        long prevTime = System.nanoTime();
        final FileInputStream fis = new FileInputStream(
sampleDataFile );
        final BufferedInputStream bis = new BufferedInputStream( fis,
( int ) ( buffsize * ( 1 - ratio ) ) ); /* buffsize in bytes */
        final InputStreamReader isr = new InputStreamReader( bis,
EIO.UTF8Charset );
        final BufferedReader ibr = new BufferedReader( isr, ( int ) (
buffsize * ratio / 2 /* in chars */ ) );


so for example if ratio = .5 and buffsize =32K,
then the stream will get 16K bytes and the reader will get 8k chars.

This is the optimum ratio.

-- 
Roedy Green Canadian Mind Products http://mindprod.com
Culture is your operating system. 
~ Terence McKenna (born: 1946-11-16 died: 2000-04-03 at age: 53)

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Thread

byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-06 23:48 -0700
  Re: byte stream vs char stream buffer Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-05-08 13:30 +0000
    Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-09 09:34 -0700
      Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-10 13:18 -0700
        Re: byte stream vs char stream buffer Robert Klemme <shortcutter@googlemail.com> - 2014-05-10 23:24 +0200
          Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-10 16:08 -0700
            Re: byte stream vs char stream buffer Robert Klemme <shortcutter@googlemail.com> - 2014-05-11 16:02 +0200
              Re: byte stream vs char stream buffer markspace <markspace@nospam.nospam> - 2014-05-11 11:50 -0700
                Re: byte stream vs char stream buffer markspace <markspace@nospam.nospam> - 2014-05-11 12:10 -0700
                Re: byte stream vs char stream buffer Robert Klemme <shortcutter@googlemail.com> - 2014-05-11 21:34 +0200
                Re: byte stream vs char stream buffer markspace <markspace@nospam.nospam> - 2014-05-11 12:55 -0700
                Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-16 16:55 -0700
                Re: byte stream vs char stream buffer markspace <markspace@nospam.nospam> - 2014-05-16 17:36 -0700
                Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-16 19:52 -0700
              Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-16 16:37 -0700
          Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-10 17:21 -0700
            Re: byte stream vs char stream buffer Martin Gregorie <martin@address-in-sig.invalid> - 2014-05-11 09:05 +0000
              Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-12 02:07 -0700
                Re: byte stream vs char stream buffer Silvio <silvio@internet.com> - 2014-05-12 12:20 +0200
                Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-16 20:19 -0700
                Re: byte stream vs char stream buffer Roedy Green <see_website@mindprod.com.invalid> - 2014-05-18 05:28 -0700
                Re: byte stream vs char stream buffer Silvio <silvio@internet.com> - 2014-05-18 23:54 +0200

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