New article on Intel's 3DXP

Article: Intel’s Plans for 3DXP DIMMs Emerge
By: Michael S (already5chosen.delete@this.yahoo.com), December 1, 2018 7:56 am
Room: Moderated Discussions
Howard Chu (hyc.delete@this.symas.com) on December 1, 2018 5:23 am wrote:
> David Kanter (dkanter.delete@this.realworldtech.com) on July 23, 2018 9:02 am wrote:
> > In honor of our anniversary, I have a new article on Intel's 3DXP DIMMs:
> >
> > Intel will offer 3DXP-based DIMMs (previously codenamed Apache
> > Pass) that use the DDR4 interface on the next-generation
> > Cascade Lake server processor. The first DIMMs will be available in 128GB, 256GB, and 512GB capacities and
> > work with a new software architecture for persistent memory.
> > Intel and its partners have enabled the new persistent
> > memory programming model for Java, Linux, VMware, and Windows and many customers are eagerly awaiting the
> > non-volatile, high-capacity memory for in-memory databases and other applications.
> >
> > I also point out many of the areas Intel has been less than forthcoming,
> > particularly around security and serviceability.
> >
> > As always - comments, questions, and feedback are appreciated.
> >
> > David
>
> I've spent several weeks working with Intel to benchmark LMDB on Optane DIMMs, starting this
> past July. Unfortunately, we still don't have permission to discuss performance results. (But
> you can check out our results on Optane SSDs here http://www.lmdb.tech/bench/optanessd/ )
>
> Some comments and bragging though:
> LMDB Lightning Memory-Mapped DB works out of the box with all operating modes
> of Optane DIMMs. Whether using the DIMMs configured as a raw block device, or
> using regular file access through a filesystem, with or without DAX. All of
> these modes were tested and It Just Works.
>
> But, presenting Optane DIMMs as separate storage is not sensible, and IMO all
> the work done at SNIA to create their PMDK (which we don't use) was wasted
> effort.
>
> It is a fact of computing that the size of work always grows to exceed the
> available space. Even with 512GB NVDIMMs and terabytes of addressable
> "RAM". What SNIA has done is allow people to use NVDIMMs as RAMdisks. Hello,
> RAMdisks went out of style in the late 1980s, for good reasons. Primarily
> because they require users to explicitly decide what portions of their data
> to move onto RAMdisks, forcing them to leave other portions of their data
> still on slower storage. The only sensible way to use finite RAM is as a cache
> for (nearly) infinite secondary storage. And a cache should operate invisibly,
> so there should be no need for special APIs like PMDK.
>
> Personally I don't believe Optane DIMMs are going to replace DRAM, but tech
> like STT-MRAM has a good shot, if they ever reach parity to DRAM density.

I don't quite get it. Why parity is enough? Doesn't new tech has to be at least 1.5x to 2x denser in order to get a shot at replacement of old tech? Especially something like MRAM that seems to get an inherent disadvantage in write energy.

Or do you consider non-volatility an advantage?
I used to think about non-volatility as minor disadvantage, but in lights of all those new security threats around I am starting to think that may be disadvantage is not so minor.

> So
> we shouldn't be building software systems around the notion of mixed RAM/NVRAM
> memory maps. We should assume that eventually we're going to have machines
> with 100% NVRAM, and design accordingly. That means you want a kernel whose
> pagecache manager knows how to reuse the hot contents of NVRAM after a reboot.
> That's all you need, the rest of user space can go on without changing a single
> line of code.
>

< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
New article on Intel's 3DXPDavid Kanter2018/07/23 09:02 AM
  New article on Intel's 3DXPGroo2018/07/23 12:53 PM
    New article on Intel's 3DXPMichael S2018/07/23 01:47 PM
  New article on Intel's 3DXPTeemo2018/07/23 04:38 PM
    New article on Intel's 3DXPWes Felterw2018/07/23 08:41 PM
    Flash DIMMs = bad ideaDavid Kanter2018/07/24 03:31 AM
      Flash DIMMs = bad ideaEmil Briggs2018/07/24 05:30 AM
        Flash DIMMs = bad ideaDavid Kanter2018/07/24 05:49 AM
          Flash DIMMs = bad ideaMichael S2018/07/24 05:59 AM
          Flash DIMMs = bad ideaEmil Briggs2018/07/24 07:29 AM
          Flash DIMMs = bad ideaDoug S2018/07/24 07:49 AM
            price Michael S2018/07/24 02:16 PM
              price Doug S2018/07/24 02:32 PM
                price Michael S2018/07/24 02:49 PM
            Flash DIMMs = bad ideablaine2018/12/03 03:40 PM
              Flash DIMMs = bad ideaWes Felter2018/12/04 11:07 AM
                Flash DIMMs = bad ideaRichardC2018/12/04 03:09 PM
        Flash DIMMs = bad ideaMichael S2018/07/24 05:51 AM
        Flash DIMMs = bad ideaAdrian2018/07/24 06:35 AM
          Flash DIMMs = bad ideaRicardo B2018/07/24 08:24 AM
        Flash DIMMs = bad ideabakaneko2018/07/24 05:55 PM
  New article on Intel's 3DXPEtienne2018/07/25 04:02 AM
  New article on Intel's 3DXPHoward Chu2018/12/01 05:23 AM
    New article on Intel's 3DXPMichael S2018/12/01 07:56 AM
      New article on Intel's 3DXPanon2018/12/01 08:21 AM
        New article on Intel's 3DXPHoward Chu2018/12/01 12:52 PM
          New article on Intel's 3DXPAdrian`2018/12/01 02:43 PM
            New article on Intel's 3DXPAdrian2018/12/01 10:05 PM
              New article on Intel's 3DXPHoward Chu2018/12/11 04:17 AM
                New article on Intel's 3DXPAdrian2018/12/11 04:42 AM
                New article on Intel's 3DXPMaynard Handley2018/12/11 07:20 AM
                  New article on Intel's 3DXPwumpus2018/12/11 08:36 AM
                  New article on Intel's 3DXPAnon2018/12/11 04:21 PM
                    New article on Intel's 3DXPMaynard Handley2018/12/11 04:32 PM
                      New article on Intel's 3DXPAnon2018/12/11 11:29 PM
                        New article on Intel's 3DXPMaynard Handley2018/12/12 10:32 AM
                          New article on Intel's 3DXPwumpus2018/12/12 11:07 AM
                            New article on Intel's 3DXPMaynard Handley2018/12/12 11:41 AM
                              New article on Intel's 3DXPAnon2018/12/12 02:55 PM
                          New article on Intel's 3DXPAnon2018/12/12 02:49 PM
                      New article on Intel's 3DXPAnne O. Nymous2018/12/12 12:14 AM
                        New article on Intel's 3DXPanon2018/12/12 05:28 AM
                        New article on Intel's 3DXPMaynard Handley2018/12/12 10:26 AM
                          New article on Intel's 3DXPAnne O. Nymous2018/12/12 01:10 PM
                      New article on Intel's 3DXPinnocent bystander2018/12/12 09:34 PM
                New article on Intel's 3DXPanon2018/12/12 01:42 PM
            New article on Intel's 3DXPHoward Chu2018/12/02 04:53 AM
              New article on Intel's 3DXPAdrian2018/12/02 06:01 AM
                New article on Intel's 3DXPHoward Chu2018/12/02 10:34 AM
                  Intel's 3DXP availabilityEtienne Lorrain2018/12/03 03:50 PM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell green?