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Groups > comp.lang.java.programmer > #27865

Re: how actually string store in java machine

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On 3/25/2014 1:19 PM, Jeff Higgins wrote:
> On 03/25/2014 04:16 PM, Jeff Higgins wrote:
>> <http://java-performance.info/string-intern-java-7-8-part-3/#more-667>
> Oops.
> <http://java-performance.info/string-intern-java-7-8-part-3>
>
>


Quoted from your link:


"Summary

     "Despite serious optimizations done in the String.intern() 
implementation in Java 7+, it still takes a noticeable time to run 
(noticeable for CPU sensitive applications). The simple example in this 
article runs 3.5 times faster without calls to String.intern(). You 
should not use String.intern() as a safety net, passing every long 
living string into it. Instead process only fields with a limited number 
of possible distinct values (for example, states/provinces if processing 
addresses) - memory savings in this situation will definitely pay off 
the initial CPU costs of String.intern()."

* * *


Basically the "you should not use String.intern() ... passing every ... 
string into it."  Is the money shot.  If you have a string that's 
obviously repetitious (like a field for states or countries) it might be 
useful, other wise not so much.

Also, using String.intern() heavily requires that you increase memory 
available to it.


"The requirement to set -XX:StringTableSize=N JVM parameter in advance 
and dealing with its fixed value"


That alone would make me want to use a HashSet instead.

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how actually string store in java machine Rishipal Singh <95rishipal@gmail.com> - 2014-03-25 09:56 -0700
  Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 10:32 -0700
  Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 10:33 -0700
  Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 13:49 -0400
    Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-25 20:29 +0100
      Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-25 20:31 +0100
        Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-25 19:37 -0700
          Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-26 09:03 +0100
            Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-26 09:11 +0100
            Re: how actually string store in java machine Jan Burse <janburse@fastmail.fm> - 2014-03-27 10:27 +0100
          Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-26 08:32 -0700
            Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-26 13:54 -0400
              Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-26 12:57 -0700
              Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-26 16:37 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-27 08:54 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-27 08:23 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-27 11:50 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-03-28 06:58 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-03-28 11:02 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-04-02 05:47 -0700
                Re: how actually string store in java machine Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-04-02 10:15 -0400
                Re: how actually string store in java machine taqmcg@gmail.com - 2014-04-03 08:58 -0700
            Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-26 17:07 -0700
      Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:07 -0400
        Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:16 -0400
          Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 16:19 -0400
            Re: how actually string store in java machine markspace <markspace@nospam.nospam> - 2014-03-25 14:00 -0700
              Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-25 17:21 -0400
                Re: how actually string store in java machine Jeff Higgins <jeff@invalid.invalid> - 2014-03-26 11:40 -0400
                Re: how actually string store in java machine Roedy Green <see_website@mindprod.com.invalid> - 2014-03-26 17:46 -0700
  Re: how actually string store in java machine Lew <lewbloch@gmail.com> - 2014-03-25 15:07 -0700

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