Changes between Version 10 and Version 11 of jazz/mpich2_guide

Timestamp:

Jul 2, 2008, 11:08:43 PM (16 years ago)

Author:

jazz

Comment:

--

jazz/mpich2_guide

@@ -137 +137 @@
 
  * 4 Choosing the Communication Device
-   * ch3:sock This is the default communication method. It uses sockets for all communications between processes.
-   * ch3:ssm This method uses sockets between nodes and shared memory within a node.
-   * ch3:shm This method only uses shared memory and only works within a single SMP. It does not support the MPI dynamic process routines such as MPI Comm spawn.
-   * ch3:nemesis This method is our new, high performance method. It supports sockets, shared memory, and Myrinet-GM at present.
+   * '''ch3:sock''' This is the default communication method. It uses sockets for all communications between processes.
+   * '''ch3:ssm''' This method uses sockets between nodes and shared memory within a node.
+   * '''ch3:shm''' This method only uses shared memory and only works within a single SMP. It does not support the MPI dynamic process routines such as MPI Comm spawn.
+   * '''ch3:nemesis''' This method is our new, high performance method. It supports sockets, shared memory, and Myrinet-GM at present.
    * Most installations should use either the '''ch3:ssm''' or '''ch3:sock''' methods. If you need __'''multi-threaded MPI'''__, you must __'''use ch3:sock'''__ in this release. If you have __'''a cluster of SMPs and do not need a multi-threaded MPI'''__, then select __'''ch3:ssm'''__. If you are interested in trying out our highest-performance device, and need neither threads nor the dynamic process routines from MPI, then you can use ch3:nemesis.
+
  * 5.1.5 Running MPD on multi-homed systems
 {{{
 n1% mpd --ifhn=192.168.1.1 &
 }}}
+
  * 5.1.6 Running MPD as Root
    * '''MPD can run as root to support multiple users simultaneously.'''
    * To use root’s ring, they must use an option named '''MPD_USE_ROOT_MPD'''.
 {{{
+bio-cluster-12:~# cat /etc/mpd.conf
+MPD_USE_ROOT_MPD=1
+secretword=this_is_password
 }}}
 
+ * 5.1.7 Running MPD on SMP’s
+{{{
+mpd --ncpus=2
+}}}
+
+ * 5.1.8 Security Issues in MPD
+   * '''mpdboot''' uses '''ssh''' by default, although the less secure rsh can be used if the user chooses.
+   * When a single new mpd joins a ring of existing mpd’s, user must have the '''same secretword''' set in his ''.mpd.conf'' file on each machine. ''.mpd.conf'' file must be readable only by the user starting the
+mpd; otherwise the mpd will refuse to read it. (i.e. chmod 600 .mpd.conf)
+   * How '''mpiexec''' connects to the local '''mpd'''? This is done through a '''Unix socket''' in '''/tmp''' rather than through an '''INET socket'''.
+
 == [http://www.clustertech.com/cpe-eval/doc/mpich2instguide.pdf MPICH2 Installation and Configuration Guide] ==