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Groups > comp.lang.java.programmer > #14641
| From | Eric Sosman <esosman@ieee-dot-org.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: multithreaded cache? |
| Date | 2012-05-19 07:09 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <jp7v1f$c15$1@dont-email.me> (permalink) |
| References | (1 earlier) <a1k06fFtdtU1@mid.individual.net> <4fb69812$0$6849$e4fe514c@news2.news.xs4all.nl> <a1nu7sFnnpU1@mid.individual.net> <jp6iji$n6m$1@dont-email.me> <J%Ftr.22162$TC4.17002@newsfe14.iad> |
On 5/19/2012 1:15 AM, Daniel Pitts wrote:
> On 5/18/12 3:31 PM, Eric Sosman wrote:
>> On 5/18/2012 5:45 PM, Robert Klemme wrote:
>>>[...]
>>> You didn't show it here, did you? I can's seem to find it in the thread.
>>> Note that CHM does also do synchronization. I am not sure from your
>>> statement what exact locking scheme you apply. There does seem to be one
>>> difference though: I my version the second lock goes away after the
>>> value has been computed so there is only the sync of CHM left.
>>
>> It seems to me that if N threads query the same key at about
>> the same time, they may all miss the map and go off to perform
>> the slow computation.
> Nope, they will all create a "Reference" object that *can* perform the
> calculation, however because the method uses "putIfAbsent", only the
> first calculating "Reference" object is actually ever used.
> [...]
Re-reading, I think you're right. "Never mind," as Emily
Litella used to say.
--
Eric Sosman
esosman@ieee-dot-org.invalid
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multithreaded cache? bugbear <bugbear@trim_papermule.co.uk_trim> - 2012-05-15 10:14 +0100
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-15 11:41 +0200
Re: multithreaded cache? Roedy Green <see_website@mindprod.com.invalid> - 2012-05-15 15:57 -0700
Re: multithreaded cache? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-15 16:13 -0700
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-16 01:22 +0200
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-16 01:19 +0200
Re: multithreaded cache? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-15 20:26 -0400
Re: multithreaded cache? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2012-05-15 21:41 -0300
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-16 09:26 +0200
Re: multithreaded cache? "Mike Schilling" <mscottschilling@hotmail.com> - 2012-05-26 14:54 -0700
Re: multithreaded cache? Roedy Green <see_website@mindprod.com.invalid> - 2012-05-16 22:03 -0700
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-21 15:25 +0200
Re: multithreaded cache? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-15 08:22 -0400
Re: multithreaded cache? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-15 09:56 -0700
Re: multithreaded cache? bugbear <bugbear@trim_papermule.co.uk_trim> - 2012-05-16 14:33 +0100
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-17 11:54 +0200
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-17 12:06 +0200
Re: multithreaded cache? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-17 09:51 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-17 20:48 +0200
Re: multithreaded cache? Sebastian <sebastian@undisclosed.invalid> - 2012-05-20 01:35 +0200
Re: multithreaded cache? Sebastian <sebastian@undisclosed.invalid> - 2012-05-20 01:48 +0200
Re: multithreaded cache? Lew <noone@lewscanon.com> - 2012-05-19 18:11 -0700
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-18 20:42 +0200
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-18 23:45 +0200
Re: multithreaded cache? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-18 18:31 -0400
Re: multithreaded cache? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-05-18 22:15 -0700
Re: multithreaded cache? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-05-19 07:09 -0400
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-19 12:33 +0200
Re: multithreaded cache? Lew <noone@lewscanon.com> - 2012-05-19 14:24 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-21 21:15 +0200
Re: multithreaded cache? Lew <noone@lewscanon.com> - 2012-05-23 23:11 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-24 23:05 +0200
Re: multithreaded cache? Gene Wirchenko <genew@ocis.net> - 2012-05-24 20:11 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-25 17:42 +0200
Re: multithreaded cache? Arved Sandstrom <asandstrom3minus1@eastlink.ca> - 2012-05-25 07:09 -0300
Re: multithreaded cache? Silvio Bierman <silvio@moc.com> - 2012-05-21 15:21 +0200
Re: multithreaded cache? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2012-05-24 23:22 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-05-25 17:36 +0200
Re: multithreaded cache? Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2012-06-02 12:27 -0700
Re: multithreaded cache? Robert Klemme <shortcutter@googlemail.com> - 2012-06-02 21:54 +0200
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