Notes for second evening session (Tue Jan 30)

This file is: /discussion/disc2.html

1. CM5

How to log in, compile and run "hello world".
  1. Machine names
    rodin : front end to 32 nodes
    moore: front end to 64 nodes (will be shipped back to TMC on February 1)
    If you have CM-5 related questions, send mail to cm5-questions@rodin
    add to PATH /usr/cm5/bin:/usr/cm5/local/bin
    add to MANPATH /usr/cm5/man:/usr/cm5/local/man
  2. Basic Architecture (will be covered in class, also see /cm5docs/tech-summary).
    Lots of on-line Connection Machine documentation: use cmview (CM5 hypertext documentation)
  3. CM5 executables:
    consists of a host program to run on the
    host, and a node program.
    Sometimes the host program is invisible to you (split-C, cm-fortran). Each program is a separate normal object file, each with it's own 'main()' routine.
  4. Programs: 
          cmview: view Connection Machine on-line documentation
      cmps: display the status of current CM processes (memory usage,
	    number of active processes, etc.)
            Useful to tell how loaded the machine is.
            *'d pid tells which one is currently running.
      djm: distributed job manager
         Method to submit batch jobs. Does a nice
         job with redireting I/O appropriately.
           -help to get options
         Main interface 'job'
         Useful Commands:
             status  Show the status of all running jobs   
             submit  Submit a background job
             run     run an interactive job
             signal  send a signal to a running job
             kill    kill a running job
      cmjoin: produce a CM5 executable from
         two standard executable files.
      cmld: CM5 link editor for object files.
          This is what you use in a Makefile.

  5. Things to be aware of:

         ts-daemon: Liaison process between host and nodes
       Sometimes goes down.
     If the thing is down, send mail to tsd-down@rodin. If it persists, 
     send mail to fraser@cs.

         

  6. Compiling and linking:

         - host/node programs
     - sometimes it's hidden from you.
     - Standard .o files.
     - Use an already working makefile (take the one we supply)

    

  7. hello-host.c

    

#include <stdio.h>
#include <cm/cmmd.h>


main()
{
  CMMD_enable();
  printf("Hello world from host.\n");
}


    

  8. hello-node.c

    

#include <stdio.h>
#include <cm/cmmd.h>

main()
{
  int myaddress;
  CMMD_fset_io_mode(stdout, CMMD_independent);
  myaddress =index.html CMMD_self_address();
  printf("Node %d: Hello world\n",myaddress);
  CMMD_enable_host();
}


    

  9. Makefile

    

    TARGET          =index.html hello
HOST_SRCS       = hello-host.c
HOST_OBJS       = $(HOST_SRCS:%.c=%.o)
NODE_SRCS       = hello-node.c
NODE_OBJS       = $(NODE_SRCS:%.c=%.o)
INCDIRS         = /usr/cm5/include
HOST_LIBDIRS    = /usr/cm5/lib
NODE_LIBDIRS    = /usr/cm5/lib
HOST_LIBS       =
NODE_LIBS       =
CC              = gcc

%-host.o: %-host.c
        $(CC) -DCP_CODE $(CFLAGS) $(INCDIRS:%=-I%) -c $<
%-node.o: %-node.c
        $(CC) $(CFLAGS) $(INCDIRS:%=-I%) -c $<
$(TARGET):      $(NODE_OBJS) $(HOST_OBJS)
        /usr/cm5/bin/cmmd-ld \
        -comp $(CC) -o $(TARGET) \
        -node $(NODE_OBJS) $(NODE_LIBDIRS:%=-L%) $(NODE_LIBS:%=-l%) \
        -host $(HOST_OBJS) $(HOST_LIBDIRS:%=-L%) $(HOST_LIBS:%=-l%)
clean:
        rm -f $(TARGET) $(NODE_OBJS) $(HOST_OBJS) *~ .make.state .nse_depinfo
See document 'CMMD User's Guide' underneath /cm5docs.html

2. Solaris Threads

Machine: one of ICSI 4 processing SS10 machines (will be announced later)

Terminology:

  • Thread - a sequence of instructions executed within the context of a process.
  • Lightweight processes (LWP) - "virtual cpus"
  • Bound vs unbound threads
  • Major thread operations: thr_create, thr_self, thr_yield, thr_suspend, thr_continue, thr_kill, thr_exit

    • hello.c
    /* gcc -D_REENTRANT hello.c -o hello -lthread */ #include <stdio.h> #include <thread.h> #define NUM_THREADS 10 void* hello(void* result); mutex_t mutex; main() { thread_t my_threads[NUM_THREADS]; int result; int i; for(i=0; i<NUM_THREADS; i++){ thr_create(0, 0, hello, &result, 0, &my_threads[i]); } /* wait for all child threads to terminate */ for(i=0; i<NUM_THREADS; i++){ thr_join(my_threads[i], NULL, NULL); } printf("All children terminated\n"); } void* hello(void* result) { /* avoid interleaving of messages */ mutex_lock(&mutex); printf("Thread id [%u]: hello\n", thr_self()); mutex_unlock(&mutex); return NULL; }