Groups > comp.lang.java.programmer > #39582

Re: Threads [Was: Get real, user and system time]

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From	Eric Sosman <esosman@comcast-dot-net.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Threads [Was: Get real, user and system time]
Date	Tue, 21 Jul 2020 15:46:23 -0400
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On 7/21/2020 12:55 PM, Martin Gregorie wrote:
> On Tue, 21 Jul 2020 08:42:32 -0400, Eric Sosman wrote:
>> This sounds like the "green threads" model used in Old-Time Original
>> Java of a quarter-century ago.  Is Linux still stuck with that relic?
> [...]
> AFAIK Java uses the standard thread module but I could be wrong: I
> haven't examined its inner workings - just know that a running Java
> program looks the same in 'top' as a threaded C program while multiple
> processes with with shared memory look quite different.

     Okay, then: The external evidence ("JVM has only one `top' line")
means that Java isn't using the old "LinuxThreads" implementation, but
we can't really tell whether it is or isn't using "green threads."

>> Anyhow: If you're right, that would explain why nobody runs Java
>> on Linux multi-core servers ...
>>
> More do that you may realise: my mail archive is Java and runs on a dual
> Athlon. I run a variety of Java applications on this Intel i5 based
> laptop. All my computers run Linux apart from one or two PIC-based
> devices (PicAXE and Parallax STAMP) but those don't run Java.

     I guess my intended ironic tone didn't survive transcription onto
Usenet.  Shoulda used a smiley ...

-- 
esosman@comcast-dot-net.invalid
Maskless Trump is a bare-faced liar.
One hundred eighty-three days to go.

Thread

Get real, user and system time Cecil Westerhof <Cecil@decebal.nl> - 2020-07-18 16:26 +0200
  Re: Get real, user and system time Martin Gregorie <martin@mydomain.invalid> - 2020-07-18 20:59 +0000
    Re: Get real, user and system time Luuk <luuk@invalid.lan> - 2020-07-20 08:06 +0200
      Re: Get real, user and system time Martin Gregorie <martin@mydomain.invalid> - 2020-07-20 08:55 +0000
  Re: Get real, user and system time Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2020-07-21 01:40 +0200
    Re: Get real, user and system time Martin Gregorie <martin@mydomain.invalid> - 2020-07-21 11:52 +0000
      Threads [Was: Get real, user and system time] Eric Sosman <esosman@comcast-dot-net.invalid> - 2020-07-21 08:42 -0400
        Re: Threads [Was: Get real, user and system time] Martin Gregorie <martin@mydomain.invalid> - 2020-07-21 16:55 +0000
          Re: Threads [Was: Get real, user and system time] Eric Sosman <esosman@comcast-dot-net.invalid> - 2020-07-21 15:46 -0400
            Re: Threads [Was: Get real, user and system time] Martin Gregorie <martin@mydomain.invalid> - 2020-07-21 20:16 +0000
          Re: Threads [Was: Get real, user and system time] Martin Gregorie <martin@mydomain.invalid> - 2020-07-21 23:14 +0000
      Re: Get real, user and system time Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2020-07-22 00:23 +0200

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