Red Hat / Fedora :: How To Change From Serial To Parallel Mode On Cluster
Jun 10, 2010
I compiled a code on a Linux cluster machine with mpich and ifort. A test run shows that the program works fine. However, it seems that the program is running in serial instead of parallel mode: reducing the number of CPU's from 32 to 3 does not increase the time it takes to run the simulation. Infact, the simulation is slightly faster with 3 compared to 32 CPU's. Unfortunately I have very little experience on the subject.
My questions are:
(1) How can I be 100% sure my code is running in parallel and not in serial mode?
(2) If the code is running serial, what do I need to do to make it run in parallel mode?
Details:
For submission I use a jobscript which includes the following lines:
Red Hat 4.1.2-46
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Apr 22, 2010
I have been trying out serial and parallel data communication on Fedora 13 Beta. I can easily see the list of serial ports through:
Code:
setserial -g /dev/ttyS[0-3]
And can also write some data through:
Code:
ll > /dev/ttyS0
But I am unable to see parallel ports
I can see something like:
Code:
/dev/parport0
But when I try out:
ll > /dev/parport0
It throws error.
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Aug 8, 2010
I have a little hardware project and I would like to use the parallel port. I basically want to display status code on top of other custom peripheral on an headless server. I only use output as the display (7 segment) is not part of the device itself. The problem is, the parallel port only have 8 standard I/O pins. I have read somewhere that there is a way to change the mode of the port to enable more data pins using a specification not backward compatible with the "classic" mode (so not enabled by default). I didn't find any other information about this. As I would like to have all 17 non-ground pin to avoid using more circuitry than necessary, how to turn this mode on?
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Nov 6, 2010
I am trying to build GFS2 cluster with 2 or 3 Fedora 14 nodes, but I've encountered some problems from the start. First luci does not work at all in Fedora 14. There is no luci_admin and even if I manage to start luci service, I get a blank white screen when I try to open it from the browser. I've googled a bit and found that I'd might be able to setup GFS if I manage to build cluster.conf manually and start the cluster suite, but I cannot find documentation on how to create cluster.conf anywhere. If anyone knows how to setup GFS2 without a cluster suite or how to configure cluster.conf.
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Apr 20, 2011
I've just had to change the MOBO and trying to get the serial port working, I see from previous posts there are some problems lurking in the past.
setserial -g /dev/ttyS*
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4
/dev/ttyS1, UART: unknown, Port: 0x02f8, IRQ: 3
/dev/ttyS2, UART: unknown, Port: 0x03e8, IRQ: 4
/dev/ttyS3, UART: unknown, Port: 0x02e8, IRQ: 3
but I'm not seeing anything from a GPS receiver in NMEA at 4800 no par 1 stp I know that was working about a year ago. I think udev was not helping ,as I was getting permission denied to the com port, I added myself to group dialout. and no message on startup now
I need to be able to talk to a piece of kit with 9600 baud and nothing. I have win32 s/w to drive it , but it falls over in wine. My laptop still has win7 on it in a tiny partition but no 9w d connector and I'm waiting for a USB converter cable. Too many variables ! I'd forgotten all the hassle of having to install drivers just to get basic things running. But as the stupid thing couldn't manage using the driver for my NIC, I was stuck with hyper-terminal, and nothing from the GPS board @4800 or another piece of equipment running at 9600. I suspect the com port on the new mobo doesn't wan to play
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Jun 15, 2011
The first time I started F15 the following notice appeared (approx.: I have translated it from spanish):
Quote:
Unfortunately GNOME 3 failed on having started and it is now in alternative mode. It probably signifies that your system (graphic hardware or controller) is not capable of executing GNOME 3 complete.
Computer data: AMD Athlon XP 2400+ 2,01GHz; 1.5 GB RAM; ATI Radeon 9200SE. Fedora 15.
How can I change from "alternative mode " to another more friendly not 3D desktop?
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Sep 14, 2009
The system always boot up in Graphic Mode. After installation of Web Server, I want to disable Graphic Mode and change it to boot to Text Mode to save memory. Is there a way to disable graphic mode?
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Feb 17, 2009
FC9 - Sulphur, x86, nothing fancy
Did an update (damn the unofficial repos!)
Found a problem with pam_passwdqc module.
Like the title says, I'm unable to change root's password.
I boot into singleuser mode, run passwd, get the
Code:
Boot into multiuser mode and I'm still unable to login.
Two questions:
1) Anyone have a 'default' /etc/pam.d/system-auth that I can replace with the system-auth that was obliterated by the pam_passwdqc update?
2) Any other ideas?
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Nov 25, 2010
How can I change the window focus mode in compiz in F14? I prefer point focus rather than click focus, but the 'system -> preferences -> windows' cannot run in compiz environment.
Also, can I save the position of the terminal in compiz? I don't want to adjust the terminal positions manually after each logging in.
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Aug 16, 2011
How do I change boot splash in fedora 15 fallback mode.
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Sep 7, 2010
I have lenovo g560 laptop with bcm4313 wireless adaptor, and i want to change it to monitor mode using ndiswrapper with bcmwl5 driver. The kernel installed in my laptop is 2.6.34.6-47.fc13.i686, and the version of ndiswrapper is 1.54-4.fc13.29.i686. The problem is that i can't use any ndiswrapper options:
[root@localhost admin]# ndiswrapper -l
bash: ndiswrapper: command not found
is it the kernel that cause this problem?, if not i wants to know how to solve it.
[Code]...
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May 21, 2011
i have a two node drbd cluster, while drbd1 is primary and drbd2 is slave i should make drbd1 slave and unmount drbd partition and make make drbd2 primary and mount drbd partition to see content on drbd2is it any way to automate it so as drbd1 goes down, drbd1 make itself primary and mount the partition?
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Mar 15, 2011
I'm having a very strange problem with red hat cluster. After testing it in the lab, I tried to install a new cluster and received the following error: cman not started: Cannot start, cluster name is too long or other CCS error /usr/sbin/cman_tool: aisexec daemon didn't start I've checked the internet for that error, but nothing. I decided to to take the example from cluster.conf man, which looks like that :
[Code]...
And still I get the same error. I can find my servers both from DNS (FQDN and short name) and they also appear in /etc/hosts.
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Sep 1, 2011
I am working in a project that needs to set up an Apache Web Cluster. The cluster needs to be High-availability (HA) cluster and Load-balancing cluster. Someone mentioned the use of Red Hat Cluster Suite, but, honestly, I can't figure out how it works, I haven't been able to configure it correctly. The project currently have two nodes, but we need to support at least three nodes in the cluster.
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Mar 18, 2009
I am using Fedora 10 and I need to change the defaults that get set on the serial port.I know how to do what I need to in Windows, but I can't seem to figure it out in Linux.
Windows Settings:
Bits/Second '115200'
Data Bits '8'
Parity 'None'
Stop Bits '1'
Flow Control 'None'
Receive Buffer 14 (HIGH)
Transmit Buffer 16 (HIGH)
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Sep 3, 2010
configure a separate NIC for the heartbeat. what i need to add to cluster.conf to achieve this?
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Jun 25, 2010
i have a bluetooth modem (BlueSMiRF) that is connected to Arduino Duemilanove. I am trying to see serial communication messages from the bluetooth modem.
I have Blueman Device Manager that enabled SPP (Serial Port) and it says :
Code:
Serial port connected to /dev/rfcomm0
How do I see the serial communication on this?
I tried on console
Code:
$rfcomm listen 0
but it's stuck at
Code:
Waiting for connection on Channel 1
Is there any other way to listen (and also send) to serial comm msgs on bluetooth?
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Dec 16, 2010
I was using ubuntu before i over to fedora, in ubuntu i had the commandline "hd + nameOfFile". what is the parallel command in fedora??
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Jun 3, 2011
This post is for an HP parallel printer but I think it should work for at least "some" other parallel printers.I am sure that someone smarter than me will follow up this post with a "well, just do this and that" and you will have your HP Laserjet 6P printer ready to go, but since questions litter the forums of MANY distros on how to get "at least" an HP parallel printer to work, I'll post this anyway.This may or may not work for you if you do not have an HP but you can try it.The install printer box will let you do an install for an HP Parallel and it asks for how it is to talk to it, through CUPS sock or "local host'. When we get through what I recommend you should chose "local host".
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Jun 1, 2011
I am in a situation to boot fedora 15 live cd in to command line mode, not graphical mode, for some testing purpose. how to change argument during booting mode
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Jan 13, 2010
I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5).I have /sbin/agetty -L 9600 ttyS0
in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control.I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but
cat < /dev/ttyS0. just prints out weird characters from what I type.
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Feb 21, 2009
On my CentOS 5.2 install I've installed a dual-port serial card based on the NetMOS 9835 chipset. I've followed the serial instructions, but everything they tell me to do is already done - see setserial outputs below. I've compared these values to the lspci output (below, NetMos card is at the bottom of the output) for the card and it appears right. Problem being, I can't use the serial ports. Oh and I did use search, and looked at every 9835-related article before posting this :)
[Code]....
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Oct 9, 2015
I am hoping to be able to get an old serial-touchscreen to work with a usb/serial adapter. I had this touchscreen working some years ago on different hardware. I would like to hook it to the machine I am setting up as a multimedia host with mythtv among other things.
Following the instructions I left behind when I got this to work way back when does not work. See [URL] ....
This info is a work around to get the xserver to see the touchscreen. [URL] ....
I do know that the touchscreen works as I am able to get garbage on the screen as in the first part of my howto. But I have not had any success getting xorg to see it. I wish I had posted a copy of the xorg.conf at the time, but......
There is an issue with the current xserver in testing that I am hoping the next update (in unstable) will fix when it gets pushed to testing. That is that Code: Select all# X -configure fails with a segfault. So I am not able to generate the xorg.conf needed to get it to work. I was going to post a bugreport, that is when I found out there is an update in unstable, so I am waiting for it to get pushed at the moment.
Anyway I am hoping that I can link /dev/ttyUSB0 to /dev/tty0 and get it to work. I would like some kind of guess as to my chances of success before I go to all the work of getting the monitor hooked to the host.
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Apr 18, 2011
When I boot fc14 with an already defined printer connected on the parallel port, then I can use the printer. The printer appears on parallel:/dev/lp0. But, if the printer is not connected during startup, when I connect the printer I cannot use it. Nothing happens. I have no corresponding message using "dmesg" command when I connect the printer.
I cannot make cups see that the printer is connected, using "localhost:631" in firefox. Is it possible to "mount" the printer manually? Using "system-config-printer", the printer has to be "activated", even though it is not used or even connected. Then "parport" module is installed during boot (with other related modules: "ppdev" and "parport_pc").
Then, when the printer is connected, "dmesg" shows :
lp0: using parport0 (interrupt-driven).
lp0: console ready
And, of course, it is now OK to use the printer.
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Jun 21, 2011
I have a bit of a dilemma. I'm attempting to use a microcontroller to send MIDI messages over a virtual serial port. I want to (eventually) read them with Mixxx. I'm using an FTDI chip, so I get a /dev/ttyUSB0. I've tried spikenzielabs' Serial-Midi program, but it doesn't see any serial ports. NOTEMIDI looks really old and won't compile on my 10.04 LTS machine.
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Mar 23, 2010
We have a new machine with RedHat enterprise 5 on it. I need to connect a serial cable to the serial port and talk to another system (old alpha system) instead of using a VT connected to the alpha.Does RedHat come with anything like Keaterm/hyperterm/etc etc?
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Jun 8, 2010
I am trying to do the cluster storage with the Rock Cluster storage operating system . I have install the rock cluster on the main server . and I want to connect the client with the PXE boot . when I starting the client then it boot from the PXE boot into the mode of compute node. but it ask the where is to be stored the I have give the path..then server says that not able to find the directory path.
Steps:-
1) insert-ethers
2) client is started with the PXE boot.
3) it detects the dhcp .
4) At last it demand where is to be started by cd-rom, harddisk ,nfs etc.
then I started with the nfs and I have given the lanIp of server.and server is detecting the client but client is not finding the filesystem directory. into export partition directory but it is not taking path.
PATH:-
/export/rock/install it is not finding this path then it is not able to start the o/s from PXE boot..Is there any solution and manual of rock or anyother solution then u can reply to me...
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Aug 19, 2010
I have an old, but still usable, HP Deskjet Plus inkjet printer that I have connected to the parallel port of my Fedora 13 box. I can (apparently) configure the printer using the usual print configuration tools, and have selected the recommend foomatic driver (HP DeskJet Plus Foomatic/pcl3 (recommended)) - but when I try to print the test page the job gets queued and nothing else happens. The jobs simply show as pending in the printer queue.
Current uri is parallel:/dev/lp0.
As a side note, my Epson printer on the USB port works fine, but it's using CUPS + Gutenprint v5.2.6 Simplified. Should I be trying something with a different (e.g. CUPS) driver, or a different way of specifying the foomatic driver, or what?
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Nov 19, 2010
It's some years since I last used Fedora. I'm looking at Fedora 14 KDE spin and trying to figure out how to install my old HP Laserjet parallel port printer. In the printer configuration utility I can only find options for network printers. I can't find any option to add a local printer.
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May 28, 2011
I just replaced F14 with F15 (clean install). Now, when I try to add my HP Deskjet 710 printer I'm not seeing any option to select the parallel port. I've tested the hardware with an old F10 live CD, and every thing's okay there. Does the parallel port still exist in F15, or has it been nuked?
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