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Groups > comp.lang.java.programmer > #28426

Re: byte stream vs char stream buffer

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On 10.05.2014 22:18, Roedy Green wrote:
> On Fri, 09 May 2014 09:34:09 -0700, Roedy Green
> <see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
> someone who said :
>
>> On Thu, 8 May 2014 13:30:15 +0000 (UTC), Andreas Leitgeb
>> <avl@auth.logic.tuwien.ac.at> wrote, quoted or indirectly quoted
>> someone who said :
>>
>>> I'm wondering, if your lego stack is higher than necessary.  Are you
>>> placing BufferedWriter over BufferedOutputStream? I think you can
>>> put the BufferedOutputStream back into the lego bag in that case. ;)
>>
>> I think some experiments are in order.
>
> There are the results:
> Using a file of random characters of 400 MB and buffers of 32K bytes
>
> HunkIO 1.20 seconds <-- does an all at once read.
> using BufferedReader backed with BufferedInputStream ratio 0.50
> buffsize 32768 bytes  1.65 seconds
> plain BufferedReader buffsize 32768 bytes 1.76 seconds

I find this a fairly unspecific description of the test you did.  We do 
not know what your test did to ensure file system caching or GC effects 
did not influence the measurement etc.

> The bottom line is either use HunkIO when you have the RAM or give 50%
> of your buffer space to the inputstream and 50% to the Reader
> in other works 100K of buffer space would have a 50K inputstream
> buffer and the reader would have a 25K buffer because it is measured
> in chars.  I tried ratios from .1 to .9.  50% was best.

If I'm not mistaken you did not test cases where there is just a 
BufferedReader OR a BufferedInputStream - that was what Andreas was 
hinting at if I'm not mistaken.  I don't think duplicate buffering will 
make things better.  I had expected at least three tests (double 
buffering, byte buffering, char buffering) plus the code.

Cheers

	robert

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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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