e-Notes

OpenMPI on Debian 6.0

A. Install OpenMPI

# apt-get install mpi-default-bin mpi-default-dev openmpi-doc

B. MPI Program Example

Filename: hello.c

#include <stdio.h>
#include <mpi.h>

int main(int argc, char** argv) {
    int myrank, nprocs;

    MPI_Init(&argc, &argv);
    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);
    MPI_Comm_rank(MPI_COMM_WORLD, &myrank);

    printf("Hello from processor %d of %d\n", myrank, nprocs);

    MPI_Finalize();
    return 0;
}

C. Compilation

$ mpicc hello.c -o hello

D. Execution

$ mpiexec -n 5 hello
Hello from processor 1 of 4
Hello from processor 0 of 4
Hello from processor 3 of 4
Hello from processor 2 of 4

Comments (0) 12.03.2012. 04:13 EDT

Xfce Minimal Installation on Squeeze

This is my second note on installing minimal Xfce desktop on Debian. This time, I use the new Debian GNU/Linux 6.0 "Squeeze". As usual, you have to download Debian netinst CD (190 MB) to build this system from ground up. Internet connection is needed during the installation process.

1. Download and burn Debian netinst CD

2. Install Debian "standard system"

3. Install basic Xfce desktop

# apt-get install --no-install-recommends \
xorg xfce4 alsa-base alsa-utils cpufrequtils gamin xdg-utils \
desktop-base gnome-icon-theme dmz-cursor-theme

4. Install additional Xfce application

# apt-get install --no-install-recommends \
xfce4-terminal xfce4-power-manager xfce4-screenshooter \
thunar-archive-plugin thunar-media-tags-plugin \
xfburn htop squeeze bzip2 zip unzip unrar-free

Continue reading Comments (7) 06.05.2011. 11:46 EDT

Mount FAT32 Partition Automatically

This guide will show you how to mount FAT32 partition automatically. This guide also show you how to set the default file ownership and permission on this FAT32 partition.

1. Find your FAT32 partition name

# fdisk -l

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xcacacaca

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3916    31455238+   7  HPFS/NTFS
/dev/sda2            3917        4047     1052257+  82  Linux swap / Solaris
/dev/sda3            8925       38912   240878610    f  W95 Ext'd (LBA)
/dev/sda4            4048        8924    39174502+  83  Linux
/dev/sda5            8925       34420   204796588+   b  W95 FAT32

Partition table entries are not in disk order

The fdisk program output shows us that the name of FAT32 partition in the disk is /dev/sda5.

Continue reading Comments (0) 16.11.2010. 02:36 EST

ZTE AC2726i USB Modem Setup

1. Install usb-modeswitch

# apt-get install usb-modeswitch

2. Check USB modem detection

Plug-in the USB modem and check whether it is detected correctly by the system.

# lsusb
Bus 001 Device 003: ID 19d2:fff1 ONDA Communication S.p.A.
...

# dmesg
...
[  217.861635] usbcore: registered new interface driver usbserial
[  217.861674] usbserial: USB Serial support registered for generic
[  217.861805] usbcore: registered new interface driver usbserial_generic
[  217.861811] usbserial: USB Serial Driver core
[  217.889384] usbserial: USB Serial support registered for GSM modem (1-port)
[  217.889475] usbcore: registered new interface driver option
[  217.889482] option: USB Driver for GSM modems: v0.7.2
[  217.900937] option 1-1:1.0: GSM modem (1-port) converter detected
[  217.901208] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[  217.901248] option 1-1:1.1: GSM modem (1-port) converter detected
[  217.901340] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[  217.901378] option 1-1:1.2: GSM modem (1-port) converter detected
[  217.901469] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[  217.901505] option 1-1:1.3: GSM modem (1-port) converter detected
[  217.901823] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
[  217.901860] option 1-1:1.4: GSM modem (1-port) converter detected
[  217.901949] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4
...

Continue reading Comments (0) 25.10.2010. 06:19 EDT

Remove Service from System Startup

I'll use PostgreSQL service (daemon) as an example for this guide.

1. Stop this service first

# /etc/init.d/postgresql-8.3 stop
Stopping PostgreSQL 8.3 database server: main.

2. Remove this service from system startup

# update-rc.d -f postgresql-8.3 remove
 Removing any system startup links for /etc/init.d/postgresql-8.3 ...
   /etc/rc0.d/K21postgresql-8.3
   /etc/rc1.d/K21postgresql-8.3
   /etc/rc2.d/S19postgresql-8.3
   /etc/rc3.d/S19postgresql-8.3
   /etc/rc4.d/S19postgresql-8.3
   /etc/rc5.d/S19postgresql-8.3
   /etc/rc6.d/K21postgresql-8.3

Note the sequence number for start (S) and kill (K). In this example these numbers are 19 and 21. You will need them to restore this service as before.

Continue reading Comments (0) 15.10.2010. 09:20 EDT

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