[Beowulf] dsh command

unix_no_win unix_no_win at yahoo.com
Tue Jun 22 16:47:10 EDT 2004


dsh -a -e 'ps -ef' 2>&1 >temp

--- "Ngan, Michael (NIH/NCI)" <nganm at mail.nih.gov>
wrote:
> I am trying to get a list of processes from all
> nodes into a temp file so I
> can grep it by userid. The following command:
> 
> Dsh -a -e 'ps -ef' > temp
> 
> Just print the outprint to the screen, instead send
> them to the temp file. I
> wonder what is the correct way to write this
> command.
> 
> Thanks,
> 
> Mike
> 
> --
> Michael Ngan, Contractor                   NCI/NIH
> mailto:nganm at mail.nih.gov                8138-6130
> Executive Blvd
> (W) (301) 402-0324                               
> Rockville, MD 20852, USA
> (H) (301) 208-1610                                
> http://linus.nci.nih.gov
> 
> -----Original Message-----
> From: Mike Davis [mailto:jmdavis at mail2.vcu.edu] 
> Sent: Thursday, June 03, 2004 12:54 PM
> To: Mark Hahn
> Cc: beowulf at beowulf.org
> Subject: Re: [Beowulf] KVM to a compute node
> 
> The fact is that you can absolutely dispense with
> KVM for compute nodes 
> with the right setup. I have several clusters which
> only have video 
> connected at the head and 2 with KVM to all nodes.
> 
> The serial only clusters use cyclades switches
> connected to each serial 
> port. To reach an individual node you can use
> minicom from the head. 
> This works during bootup as well. As long as the
> machine has power and 
> the serial port is not locked you can get in.
> 
> Other remote reboot options include apc power
> switches which can be 
> remotely cycled. I use these as well on most of my
> clusters.
> 
> Mike Davis
> 
> 
> 
> 
> 
> Mark Hahn wrote:
> 
> >>These USB->serial boxes work fine with linux (ours
> uses the ftdi_sio
> kernel
> >>    
> >>
> >
> >sounds a bit fragile to me.  if I really wanted
> serial on a bunch of boxes,
> >I'd be most tempted to simply have box N plugged
> into box N+1.  and use a 
> >script to do the appropriate connection, of course.
> >
> >  
> >
> >>We use kermit to log on the local console to each
> machine, and have
> aliases
> >>for the combination of ssh (to the server) and
> kermit on the right tty. 
> >>    
> >>
> >
> >eeew, why do people still use grossness like kermit
> for such a simple task?
> >here's a bit of serial-port plumbing I wrote over a
> decade ago (gulp!)
> >that works on any unix machine.  feel free to hack
> it to your port
> >names/speeds/etc, remove the silly logging, etc.
> >
> >/* written by Mark Hahn <hahn at mcmaster.ca> */
> >#include <unistd.h>
> >#include <sys/time.h>
> >#include <fcntl.h>
> >#include <stdio.h>
> >#include <termios.h>
> >#include <stdarg.h>
> >
> >double gtod() {
> >    struct timeval tv;
> >    gettimeofday(&tv,0);
> >    return tv.tv_sec + 1e-6 * tv.tv_usec;
> >}
> >double startTime;
> >double ts() { 
> >    if (startTime == 0.0)
> >	startTime = gtod();
> >    return gtod() - startTime;
> >}
> >
> >FILE *fpLog = 0;
> >void log(char *format,...) {
> >    va_list ap;
> >    va_start(ap,format);
> >
> >    if (!fpLog)
> >	fpLog = fopen("debug.log","a");
> >    fprintf(fpLog,"%2.8f: ",ts());
> >    vfprintf(fpLog,format,ap);
> >    va_end(ap);
> >    fflush(fpLog);
> >}
> >void fatal(char *format,...) {
> >    static FILE *fpLog = 0;
> >    va_list ap;
> >    va_start(ap,format);
> >
> >    if (!fpLog)
> >	fpLog = fopen("debug.log","a");
> >    fprintf(fpLog,"%2.8f: ",ts());
> >    vfprintf(fpLog,format,ap);
> >    va_end(ap);
> >    fclose(fpLog);
> >    exit(0);
> >}
> >
> >int 
> >main() {
> >    struct termios t, tOrg;
> >    int fdSer = open("/dev/tty01", O_RDWR);
> >
> >    log("starting...\n");
> >
> >    if (fdSer == -1) {
> >	perror("open of serial device failed");
> >	return 1;
> >    }
> >    log("opened...\n");
> >
> >    t.c_iflag = IGNBRK | INPCK;
> >    t.c_oflag = 0;
> >    t.c_cflag = CS8 | CREAD | CLOCAL | CSTOPB;
> >    t.c_lflag = 0;
> >    cfsetispeed(&t,B19200);
> >    cfsetospeed(&t,B19200);
> >    tcsetattr(fdSer,TCSANOW,&t);
> >
> >    log("serial attr set...\n");
> >
> >    tcgetattr(0,&t);
> >    tOrg = t;
> >    t.c_iflag = 0;
> >    t.c_lflag = 0;
> >    t.c_cc[VTIME] = 1;
> >    t.c_cc[VMIN] = 1;
> >    tcsetattr(0,TCSANOW,&t);
> >
> >    log("console attr set...\n");
> >    
> >    while (1) {
> >#define bufSize 4096
> >	unsigned char buf[bufSize+1];
> >	struct timeval timeout;
> >	fd_set readset;
> >
> >	timeout.tv_sec = 10;
> >	timeout.tv_usec = 0;
> >
> >	FD_ZERO(&readset);
> >	FD_SET(0,&readset);
> >	FD_SET(fdSer,&readset);
> >
> >	log("about to select...\n");
> >
> >	if (select(fdSer+1,&readset,0,0,&timeout) == -1)
> >	    continue;
> >
> >	if (FD_ISSET(0,&readset)) {
> >	    log("stdin readable...\n");
> >
> >	    int c = read(0,buf,bufSize);
> >	    if (c > 0) {
> >		buf[c] = 0;	
> >	        log("got %d bytes from stdin:
> '%s'...\n",c,buf);
> >
> >		static unsigned char prev = 0;
> >	        log("prev is %02x\n\n",prev);
> >		if (prev == 0x1d && buf[0] == 'q')
> >		    break;
> >		prev = buf[0];
> >	        log("writing to serial...\n");
> >		write(fdSer,buf,c);
> 
=== message truncated ===



		
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