구차니의 잡동사니 모음

RTL-SDR 용으로 구매했던 녀석(RTL2832U + FC0012)를 아버지께서 안쓰신대서 돌려받아왔는데

kodi에 PVR client로 ARM(RPi)가 Yes로 되어있는 NextPVR을 설치했지만 안된다.

[링크 : https://kodi.wiki/view/PVR/Backends]

아무튼 FM이라도 나오면 좋으련만.. 라즈베리 파이로 CPU 성능이 될지 모르겠네

[링크 : https://www.rtl-sdr.com/tag/kodi/]

[링크 : http://esmasol.de/open-source/kodi-add-on-s/fm-radio-receiver/]

[링크 : https://kodi.wiki/view/Add-on:RTL-SDR_FM_Radio_Client]

의외로 많이 느리다고 해야하나?

대충 30MB/s 정도 겨우 나오는 듯..

그나저나 저 CPU 점유율 보소... ㄷㄷ

NAT로 구성되서 저렇게 많이 먹고 속도도 안나는 건가?

MPICH2 ofi, ucx

[링크 : https://www.mpich.org/about/news/]

OpenFabrics Interfaces

[링크 : https://ofiwg.github.io/libfabric/]

Unified Communication X

[링크 : https://www.openucx.org/

MVAPICH: MPI over InfiniBand, Omni-Path, Ethernet/iWARP, and RoCE

[링크 : https://mvapich.cse.ohio-state.edu/]

기본적으로 infiniband, ommipath, RDMA(xeon) 등에서 작동되는 녀석이지

일반적인 기가비트 이더넷 등에서 작동할 녀석은 아닌듯?

[링크 : https://en.wikipedia.org/wiki/MVAPICH]

특이하게도 가상화쪽에서 SR-IOV가 나오는것도 존재한다.

/etc/inittab이 안되서 찾아보니

systemctl set-default 명령을 통해서 바꾸면 된다.

# systemctl get-default
graphical.target

# systemctl set-default multi-user.target
Created symlink /etc/systemd/system/default.target → /usr/lib/systemd/system/multi-user.target.

# systemctl get-default
multi-user.target

# systemctl list-units -t target -a
  UNIT                      LOAD      ACTIVE   SUB    DESCRIPTION
  basic.target              loaded    active   active Basic System
  cryptsetup.target         loaded    active   active Local Encrypted Volumes
  emergency.target          loaded    inactive dead   Emergency Mode
  getty-pre.target          loaded    inactive dead   Login Prompts (Pre)
  getty.target              loaded    active   active Login Prompts
  graphical.target          loaded    inactive dead   Graphical Interface
  initrd-fs.target          loaded    inactive dead   Initrd File Systems
  initrd-root-device.target loaded    inactive dead   Initrd Root Device
  initrd-root-fs.target     loaded    inactive dead   Initrd Root File System
  initrd-switch-root.target loaded    inactive dead   Switch Root
  initrd.target             loaded    inactive dead   Initrd Default Target
  local-fs-pre.target       loaded    active   active Local File Systems (Pre)
  local-fs.target           loaded    active   active Local File Systems
  multi-user.target         loaded    active   active Multi-User System
  network-online.target     loaded    active   active Network is Online
  network-pre.target        loaded    active   active Network (Pre)
  network.target            loaded    active   active Network
  nfs-client.target         loaded    active   active NFS client services
  nss-lookup.target         loaded    inactive dead   Host and Network Name Lookups
  nss-user-lookup.target    loaded    active   active User and Group Name Lookups
  paths.target              loaded    active   active Paths
  remote-fs-pre.target      loaded    active   active Remote File Systems (Pre)
  remote-fs.target          loaded    active   active Remote File Systems
  rescue.target             loaded    inactive dead   Rescue Mode
  rpc_pipefs.target         loaded    active   active rpc_pipefs.target
  rpcbind.target            loaded    active   active RPC Port Mapper
  shutdown.target           loaded    inactive dead   Shutdown
  slices.target             loaded    active   active Slices
  sockets.target            loaded    active   active Sockets
  sound.target              loaded    active   active Sound Card
  sshd-keygen.target        loaded    active   active sshd-keygen.target
  swap.target               loaded    active   active Swap
  sysinit.target            loaded    active   active System Initialization
● syslog.target             not-found inactive dead   syslog.target
  time-sync.target          loaded    inactive dead   System Time Synchronized
  timers.target             loaded    active   active Timers
  umount.target             loaded    inactive dead   Unmount All Filesystems

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

37 loaded units listed.
To show all installed unit files use 'systemctl list-unit-files'.

[링크 : https://www.linuxfork.com/how-to-change-the-run-level-on-rhel-centos-7-8/]

+

아래는 안되는 왜 한지 모르겠는 뻘짓

--force를 주고도 한번에 안되서 여러번을 하고 나서야 되네..

stop 하고 나서 된건진 잘 모르겠다.

그리고 여전히 gui로 켜지는건 달라지지 않았다 ㅠㅠ

]# systemctl list-units -t target -a
  UNIT                      LOAD      ACTIVE   SUB    DESCRIPTION
  basic.target              loaded    active   active Basic System
  cryptsetup.target         loaded    active   active Local Encrypted Volumes
  emergency.target          loaded    inactive dead   Emergency Mode
  getty-pre.target          loaded    inactive dead   Login Prompts (Pre)
  getty.target              loaded    active   active Login Prompts
  graphical.target          loaded    active   active Graphical Interface
  initrd-fs.target          loaded    inactive dead   Initrd File Systems
  initrd-root-device.target loaded    inactive dead   Initrd Root Device
  initrd-root-fs.target     loaded    inactive dead   Initrd Root File System
  initrd-switch-root.target loaded    inactive dead   Switch Root
  initrd.target             loaded    inactive dead   Initrd Default Target
  local-fs-pre.target       loaded    active   active Local File Systems (Pre)
  local-fs.target           loaded    active   active Local File Systems
  multi-user.target         loaded    active   active Multi-User System
  network-online.target     loaded    active   active Network is Online
  network-pre.target        loaded    active   active Network (Pre)
  network.target            loaded    active   active Network
  nfs-client.target         loaded    active   active NFS client services
  nss-lookup.target         loaded    inactive dead   Host and Network Name Lookups
  nss-user-lookup.target    loaded    active   active User and Group Name Lookups
  paths.target              loaded    active   active Paths
  remote-fs-pre.target      loaded    active   active Remote File Systems (Pre)
  remote-fs.target          loaded    active   active Remote File Systems
  rescue.target             loaded    inactive dead   Rescue Mode
  rpc_pipefs.target         loaded    active   active rpc_pipefs.target
  rpcbind.target            loaded    active   active RPC Port Mapper
  shutdown.target           loaded    inactive dead   Shutdown
  slices.target             loaded    active   active Slices
  sockets.target            loaded    active   active Sockets
  sound.target              loaded    active   active Sound Card
  sshd-keygen.target        loaded    active   active sshd-keygen.target
  swap.target               loaded    active   active Swap
  sysinit.target            loaded    active   active System Initialization
● syslog.target             not-found inactive dead   syslog.target
  time-sync.target          loaded    inactive dead   System Time Synchronized
  timers.target             loaded    active   active Timers
  umount.target             loaded    inactive dead   Unmount All Filesystems

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

37 loaded units listed.
To show all installed unit files use 'systemctl list-unit-files'.


# systemctl status graphical.target
● graphical.target - Graphical Interface
   Loaded: loaded (/usr/lib/systemd/system/graphical.target; indirect; vendor preset: disabled)
   Active: active since Mon 2020-12-14 00:20:24 EST; 7min ago
     Docs: man:systemd.special(7)

12월 14 00:20:24 localhost.localdomain systemd[1]: Reached target Graphical Interface.

# systemctl disable  graphical.target
Removed /etc/systemd/system/default.target.

# systemctl disable graphical.target --force

# systemctl status graphical.target
● graphical.target - Graphical Interface
   Loaded: loaded (/usr/lib/systemd/system/graphical.target; static; vendor preset: disabled)
   Active: inactive (dead) since Mon 2020-12-14 00:33:58 EST; 8s ago
     Docs: man:systemd.special(7)

12월 14 00:29:09 localhost.localdomain systemd[1]: Reached target Graphical Interface.
12월 14 00:33:58 localhost.localdomain systemd[1]: Stopped target Graphical Interface.

]# systemctl list-units -t target -a
  UNIT                      LOAD      ACTIVE   SUB    DESCRIPTION
  basic.target              loaded    active   active Basic System
  cryptsetup.target         loaded    active   active Local Encrypted Volumes
  emergency.target          loaded    inactive dead   Emergency Mode
  getty-pre.target          loaded    inactive dead   Login Prompts (Pre)
  getty.target              loaded    active   active Login Prompts
  graphical.target          loaded    inactive dead   Graphical Interface
  initrd-fs.target          loaded    inactive dead   Initrd File Systems
  initrd-root-device.target loaded    inactive dead   Initrd Root Device
  initrd-root-fs.target     loaded    inactive dead   Initrd Root File System
  initrd-switch-root.target loaded    inactive dead   Switch Root
  initrd.target             loaded    inactive dead   Initrd Default Target
  local-fs-pre.target       loaded    active   active Local File Systems (Pre)
  local-fs.target           loaded    active   active Local File Systems
  multi-user.target         loaded    active   active Multi-User System
  network-online.target     loaded    active   active Network is Online
  network-pre.target        loaded    active   active Network (Pre)
  network.target            loaded    active   active Network
  nfs-client.target         loaded    active   active NFS client services
  nss-lookup.target         loaded    inactive dead   Host and Network Name Lookups
  nss-user-lookup.target    loaded    active   active User and Group Name Lookups
  paths.target              loaded    active   active Paths
  remote-fs-pre.target      loaded    active   active Remote File Systems (Pre)
  remote-fs.target          loaded    active   active Remote File Systems
  rescue.target             loaded    inactive dead   Rescue Mode
  rpc_pipefs.target         loaded    active   active rpc_pipefs.target
  rpcbind.target            loaded    active   active RPC Port Mapper
  shutdown.target           loaded    inactive dead   Shutdown
  slices.target             loaded    active   active Slices
  sockets.target            loaded    active   active Sockets
  sound.target              loaded    active   active Sound Card
  sshd-keygen.target        loaded    active   active sshd-keygen.target
  swap.target               loaded    active   active Swap
  sysinit.target            loaded    active   active System Initialization
● syslog.target             not-found inactive dead   syslog.target
  time-sync.target          loaded    inactive dead   System Time Synchronized
  timers.target             loaded    active   active Timers
  umount.target             loaded    inactive dead   Unmount All Filesystems

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

37 loaded units listed.
To show all installed unit files use 'systemctl list-unit-files'.

[링크 : https://linuxconfig.org/how-to-change-a-runlevel-on-rhel-7-linux-system]

centos8.2는 minimal로 설치해서 그런가 virbr0 가 안생기더니 풀버전으로 설치했더니 생기네.

libvirtd 데몬으로 인해서 생기는 녀석이라고 한다.

[링크 : https://fliedcat.tistory.com/167]

8.2-2004 에서는 minimal 버전이라 그랬나 10기가에서도 깔렸는데

8.3-2011 에서는 10GB 밖에 안되니 용량 늘려라고 진행 자체가 안된다

그런데 8.2 에서는 minimal이 있었는데

8.3 에서는 왜 minimal을 제공하지 않는 걸까?

+

virtual box 에서 centos8.3 설치하니 네트워크가 아노딘다.

virbr0가 잡히고 enp3s 어쩌구는 ip를 못받아온다. 멀까?

+

그래픽 컨트롤러가 원래 VMSVGA 였던가?

이미 닳아버릴대로 닳은게 보이네.

+

원본에서 크랍

짧은 거리를 오가면서 저항값이 바뀌는 구조인 듯.

로터리 저항으로 된 건 큰부품이고

이건 높이가 낮아야 하니 저런식으로 FPCB에 저항막을 붙이고 갈려 나가게 해서 내구성은 어짜피 발바닥인 듯..

클릭은 하단의 흰색 부품이 FPCB에 실장된 스위치(위 사진의 정 중앙 은색 부품)을 누르게 되어있다.