[SPDK] Re: Possible to use several hugepage files for NVMe's DMA destination?

Hi Jing,

For example,  In my system with SPDK latest code in master branch, the huge page files are mounted in /dev/hugepages, and the Huge page size is 2MB. And my SPDK process id(PID) is 53147 (this is a primary SPDK process), the huge page files used are: 
spdk_pid53417map_0,   spdk_pid53417map_1,  spdk_pid53417map_2...

If you want to know more details, you can look at the code  build_eal_cmdline function in  lib/env_dpdk/init.c file in SPDK repo.


Best Regards
Ziye Yang 

-----Original Message-----
From: Jing Liu <jingliu.cs(a)gmail.com> 
Sent: Wednesday, November 18, 2020 1:57 AM
To: Storage Performance Development Kit <spdk(a)lists.01.org>
Subject: [SPDK] Re: Possible to use several hugepage files for NVMe's DMA destination?

Cool. Thanks!

Jing

On Tue, Nov 17, 2020 at 8:50 AM Yang, Ziye <ziye.yang(a)intel.com> wrote:

> Hi Jin，
>
> I think that your version may be old. Currently, SPDK can support huge 
> page map with process id. If you use newer version, you can check the 
> file names in the huge page mounted folder, each  primary process will 
> have its own huge page file. So I think that you need to update your 
> spdk version, e.g., spdk 20.01 LTS is recommended.
>
> 发自我的iPad
>
> > 在 2020年11月17日，下午8:34，Jing Liu <jingliu.cs(a)gmail.com> 写道：
> >
> > Hi,
> >
> > In general, I'm wondering how to provide the isolation of the 
> > hugepage across several processes using SPDK in one computer
> >
> > In my understanding, SPDK's hugepage is initialized by the primary
> process,
> > and all will use
> > *shmid* to be able to find that by several processes. I'm wondering 
> > is
> that
> > possible that the SPDK is initialized with several *shmid*, such 
> > that several processes can be isolated?
> >
> > PS: I'm using the SPDK 18.04.01, does some new version help?
> >
> > Thanks,
> > Jing
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