Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.java.programmer > #27865
| From | markspace <markspace@nospam.nospam> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: how actually string store in java machine |
| Date | 2014-03-25 14:00 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <lgsqpm$nc4$1@dont-email.me> (permalink) |
| References | (1 earlier) <lgsflf$pua$1@dont-email.me> <lgslfc$k81$1@news.albasani.net> <lgsnog$ugk$1@dont-email.me> <lgsoah$3r1$1@dont-email.me> <lgsoel$3r1$2@dont-email.me> |
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.
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
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
csiph-web