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Re: Java daemon

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On 13/11/2012 1:40 AM, SL wrote:
> David Lamb wrote:
>> On 12/11/2012 9:17 AM, sl@exabyte wrote:
>>> Since java also adopts the garbage collector mechanism, would java
>>> daemon suffers from the same memory problem ?
>>
>> There are several different ways to do garbage collection, so flaws in
>> one implementation have no bearing on what goes on with another.
> Why bother with it (people in the finance trade especially) ? Are the
> advantages so great over c/c++ ? If the answer is yes, I can only think that
> the reason is portability. Otherwise forget about tweaking GC; go for C/C++;
> programmer has full control over memory management, and it is faster than
> java.

GC has several big advantages over programmer control, one of them being 
how often programmers get things wrong. A bug-free GC can be written 
once, by experts, tested thoroughly, then lives on not subject to bugs 
introduced by thousands of programmers across the hundreds of packages 
you might use in any one program.

You never get reuse of already-deallocated memory, a classic source of 
segmentation faults.

You never get the most common forms of memory leak, forgetting to 
deallocate and losing the last pointer to the allocated memory. Though 
people can misprogram to have long-lived structures point to ones no 
longer needed; dunno how common that is. Technically this does not count 
as a "memory leak"; rather it's "keeping data around too long that you 
can still free eventually".

A compactifying GC can also *speed up* memory allocation and *reduce* 
heap footprint by reducing fragmentation.

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Thread

Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-12 22:17 +0800
  Re: Java daemon David Lamb <dalamb@cs.queensu.ca> - 2012-11-12 09:25 -0500
    Re: Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-12 23:55 +0800
      Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-12 22:07 +0000
        Re: Java daemon "sl@exabyte" <sb5309@hotmail.com> - 2012-11-13 10:56 +0800
          Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:08 -0500
          Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 13:59 +0800
          Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-13 21:50 +0000
            Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:43 -0500
              Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-19 01:05 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 20:41 -0500
                Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-20 00:32 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 20:07 -0500
                Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-19 20:38 -0400
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 20:22 -0500
                Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-20 17:46 -0400
              Re: Java daemon Lew <lewbloch@gmail.com> - 2012-11-18 20:10 -0800
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-19 10:50 -0500
        Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:06 -0500
          Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-13 21:36 +0000
            Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-13 17:31 -0500
              Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-14 21:33 +0000
                Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-14 16:55 -0500
                Re: Java daemon Martin Gregorie <martin@address-in-sig.invalid> - 2012-11-15 02:09 +0000
    Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 14:40 +0800
      Re: Java daemon Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-11-12 23:39 -0800
        Re: Java daemon "SL" <sb5309@hotmail.com> - 2012-11-13 16:16 +0800
      Re: Java daemon Arved Sandstrom <asandstrom2@eastlink.ca> - 2012-11-13 06:37 -0400
      Re: Java daemon David Lamb <dalamb@cs.queensu.ca> - 2012-11-13 08:46 -0500
      Re: Java daemon "John B. Matthews" <nospam@nospam.invalid> - 2012-11-13 21:23 -0500
      Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:52 -0500
      Re: Java daemon markspace <-@.> - 2012-11-18 14:02 -0800
        Re: Java daemon jlp <jlp@jlp.com> - 2012-11-19 20:39 +0100
          Re: Java daemon "SL@maxis" <ecp_gen@my-rialto.com> - 2012-11-20 15:23 +0800
  Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 09:41 -0500
  Re: Java daemon Jim Janney <jjanney@shell.xmission.com> - 2012-11-12 14:24 -0700
    Re: Java daemon Lew <lewbloch@gmail.com> - 2012-11-12 13:35 -0800
      Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-12 22:05 -0500
    Re: Java daemon Arne Vajhøj <arne@vajhoej.dk> - 2012-11-18 16:40 -0500

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