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Linux: Everything is File

Processor is a file. Harddisk is a file. Keyboard is a file. Mouse is a file. Battery is a file. Thermal sensor is a file. LCD display is a file. You can read/write to those devices. In my old Toshiba laptop, I do these to:

see my CPU info:

$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 8
model name	: Pentium III (Coppermine)
stepping	: 10
cpu MHz		: 994.720
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pse36 mmx fxsr sse up
bogomips	: 1989.44
clflush size	: 32
power management:

Note: cat is a command to output file content.

see my LCD brightness level:

$ cat /proc/acpi/toshiba/lcd
brightness:              7
brightness_levels:       8

I also can set the brightness of my LCD display by editing the file above. That's awesome!
```
$ sudo geany /proc/acpi/toshiba/lcd
```

see my laptop temperature:

$ cat /proc/acpi/thermal_zone/THRM/temperature
temperature:             53 C

see my battery state:

$ cat /proc/acpi/battery/BAT1/state
present:                 yes
capacity state:          ok
charging state:          charging
present rate:            1806 mA
remaining capacity:      333 mAh
present voltage:         11340 mV

You see, everything in Linux is abstracted into file.

Comments (2) 03.11.2009. 18:20

OpenMPI on Ubuntu 9.04

A. Install OpenMPI

$ sudo apt-get install libopenmpi-dev
$ sudo apt-get install openmpi-bin
$ sudo apt-get install openmpi-doc
$ sudo apt-get install ssh

B. Configure SSH

$ ssh-keygen -t dsa
$ cd ~/.ssh
$ cat id_dsa.pub >> authorized_keys

C. MPI Program Example

MPI_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;
}

D. Compilation

$ mpicc MPI_Hello.c -o MPI_Hello

E. Execution

$ mpiexec -n 5 MPI_Hello

Continue reading Comments (2) 14.03.2009. 18:13

MPICH2 on Windows XP

A. Prerequisite

Install Microsoft Visual C++ 2005 SP1 runtime libraries.
Install Microsoft .NET Framework 2.0.
User account with administrator privileges.

B. MPICH2 Installation

Install MPICH2 1.0.8, just follow the default.
Register user account, Start - All Programs - MPICH2 - wmpiregister.exe.

C. Compilation with Dev-Cpp

Install Dev-Cpp 4.9.9.2, just follow the default.
Download MPI project template and extract to:
```
C:\Dev-Cpp\Templates
```
Create new project, File - New - Project and choose MPI Application
Choose C Project and give the project a name, click OK.
Compile project, Execute - Compile

D. Execution

Open Start - All Programs - MPICH2 - wmpiexec.exe.
Enter the MPI program executable location and number of processes, then click Execute button.
The program output will be showed in the textarea below.

Continue reading Comments (0) 13.03.2009. 19:26

Algoritme Fox

Salah satu algoritme perkalian matriks paralel adalah algoritme Fox. Algoritme Fox mirip dengan algoritme Cannon. Keduanya menggunakan skema dekomposisi data checkerboard yang membagi matriks ke dalam blok-blok persegi. Algoritme Fox bekerja dalam tiga langkah tiap iterasinya, yaitu broadcast, multiply, dan roll.

Laporan berikut ini membahas tentang algoritme Fox menggunakan metode Foster beserta dengan analisis kompleksitas dan isoefisiensinya. Laporan ini disusun sebagai tugas akhir mata kuliah Pemrosesan Paralel Departemen Ilmu Komputer IPB. Terima kasih kepada teman-teman sekelompok yang telah membantu dalam penyusunan laporan ini.

Download: Laporan (662k) | Presentasi (610k) | MPI Code (15k)

Comments (0) 14.02.2009. 09:40

MPICH2 untuk Windows XP

Laporan di bawah ini berisi instalasi dan konfigurasi MPICH2 untuk Windows XP. Juga terdapat kasus uji dengan menggunakan program merge sort paralel. Laporan ini disusun sebagai tugas akhir praktikum Pemrosesan Paralel Departemen Ilmu Komputer IPB. Terima kasih kepada teman-teman sekelompok yang telah membantu dalam menyelesaikan laporan ini.

Download: Laporan (923k) | Presentasi (288k) | MPI Code (4k)

Comments (0) 14.02.2009. 09:07

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