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Groups > comp.lang.java.programmer > #15881
| From | Martin Gregorie <martin@address-in-sig.invalid> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Java processors |
| Date | 2012-07-08 21:41 +0000 |
| Organization | UK Free Software Network |
| Message-ID | <jtcuqk$q15$1@localhost.localdomain> (permalink) |
| References | (11 earlier) <ac1iv7lue61ncqckd8dr1vau4oik8a17np@4ax.com> <jtb5vf$jjd$1@news.albasani.net> <jtb7lc$pk3$1@news.albasani.net> <jtch2b$m9u$1@localhost.localdomain> <jtcktv$i25$1@news.albasani.net> |
On Sun, 08 Jul 2012 11:52:52 -0700, Lew wrote:
> Martin Gregorie wrote:
>> Lew wrote:
>>> HotSpot also will "unJIT" code - go back to the interpreted bytecode
>>> and drop the machine-code compilation - when circumstances change.
>>>
>> In view of this, why are we assuming that the JIT stops a method in its
>> tracks, compiles a native version and continues execution in that from
>> the stopping point? Are we sure that it doesn't do something along the
>
> "We"?
>
> I, at least, make no such assumption.
>
Fair enough: not you, but several here have been assuming that this
bytecode to native code switch occurs despite the obvious difficulties of
doing so.
> As I understand the white papers, HotSpot, at least, does not stop the
> interpreter while it's compiling, but does background compilation.
>
I wondered about this, but as it could cause potential conflicts if JIT
compilation takes significantly longer than interpreted execution of the
code section (the normal case?), described a stopping scenario because it
can't cause that sort of problem.
> I don't have a reference handy just now, but HotSpot does do something
> like the flip you describe, save for the "stopping bytecode" part, IIRC.
>
Interesting. If recompilation is needed, is more than one recompiled
version kept at a time or does the system switch back to bytecode while
the recompilation runs? Is there any data on the frequency of
recompilation vs the initial JIT pass? If its quite infrequent, then
temporary reversion to bytecode may be a worthwhile strategy, especially
if the recompilation isn't restricted to exactly the same set of bytecode
instructions.
--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |
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Java processors bob smith <bob@coolfone.comze.com> - 2012-07-05 08:01 -0700
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-05 11:28 -0400
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-05 13:00 -0500
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-05 14:31 -0400
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-05 16:42 -0500
Re: Java processors Arne Vajhøj <arne@vajhoej.dk> - 2012-07-05 20:30 -0400
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-05 21:12 -0500
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-06 00:13 -0400
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 13:26 -0700
Re: Java processors Gene Wirchenko <genew@ocis.net> - 2012-07-06 13:50 -0700
Re: Java processors Lew <lewbloch@gmail.com> - 2012-07-06 14:17 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 19:07 -0700
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-07 09:34 -0500
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-07 21:01 -0700
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-08 00:28 -0500
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-07 23:00 -0700
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-08 10:20 -0500
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-08 09:16 -0700
Re: Java processors Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-08 17:46 +0000
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-08 11:52 -0700
Re: Java processors Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-08 21:41 +0000
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-08 17:56 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-08 19:44 -0700
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-09 23:41 -0700
Re: Java processors David Lamb <dalamb@cs.queensu.ca> - 2012-07-16 13:22 -0400
Re: Java processors Lew <lewbloch@gmail.com> - 2012-07-16 14:03 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-08 19:42 -0700
Re: Java processors Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-07-10 01:13 +0200
Re: Java processors Lew <lewbloch@gmail.com> - 2012-07-09 16:26 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-11 15:41 -0700
Re: Java processors Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-07-12 01:02 +0200
Re: Java processors Wanja Gayk <brixomatic@yahoo.com> - 2012-07-21 18:46 +0200
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-21 13:05 -0400
Re: Java processors Wanja Gayk <brixomatic@yahoo.com> - 2012-07-21 19:23 +0200
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-21 14:10 -0400
Re: Java processors Wanja Gayk <brixomatic@yahoo.com> - 2012-07-23 01:17 +0200
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-22 20:15 -0400
Re: Java processors Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2012-07-22 15:13 +0200
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 19:03 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-08 19:51 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-07 21:17 -0700
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-07 23:04 -0700
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-08 09:29 -0700
Re: Java processors Lew <noone@lewscanon.com> - 2012-07-08 11:57 -0700
Re: Java processors Wanja Gayk <brixomatic@yahoo.com> - 2012-07-08 15:40 +0200
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-08 10:36 -0500
Re: Java processors Lew <lewbloch@gmail.com> - 2012-07-06 11:31 -0700
Re: Java processors Jim Janney <jjanney@shell.xmission.com> - 2012-07-05 13:02 -0600
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-05 16:09 -0500
Re: Java processors Jan Burse <janburse@fastmail.fm> - 2012-07-06 01:29 +0200
Re: Java processors Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-06 00:42 +0000
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 13:53 -0700
Re: Java processors Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-06 21:18 +0000
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-06 18:17 -0400
Re: Java processors Martin Gregorie <martin@address-in-sig.invalid> - 2012-07-06 22:29 +0000
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 19:10 -0700
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-07 09:42 -0500
Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-07 10:58 -0400
(OT) Was: Re: Java processors Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-07-07 11:38 -0400
Re: (OT) Was: Re: Java processors Gene Wirchenko <genew@ocis.net> - 2012-07-07 21:19 -0700
Re: (OT) Was: Re: Java processors "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2012-07-08 12:15 +0200
Re: Java processors Gene Wirchenko <genew@ocis.net> - 2012-07-07 21:17 -0700
Re: Java processors Jim Janney <jjanney@shell.xmission.com> - 2012-07-05 19:14 -0600
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 13:34 -0700
Re: Java processors Jan Burse <janburse@fastmail.fm> - 2012-07-06 23:04 +0200
Re: Java processors Silvio Bierman <silvio@moc.com> - 2012-07-07 00:13 +0200
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 19:16 -0700
Re: Java processors "Peter J. Holzer" <hjp-usenet2@hjp.at> - 2012-07-08 11:37 +0200
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 13:24 -0700
Re: Java processors BGB <cr88192@hotmail.com> - 2012-07-07 10:06 -0500
Re: Java processors Roedy Green <see_website@mindprod.com.invalid> - 2012-07-06 05:22 -0700
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