A simple timer (non-MPI)

struct timeval tempo1, tempo2;

long elapsed_utime; /* elapsed time in microseconds */

long elapsed_mtime; /* elapsed time in milliseconds */

long elapsed_seconds; /* diff between seconds counter */

long elapsed_useconds; /* diff between microseconds counter */

long total_usec = 0, total_msec = 0;

void StartSysTimer() {

gettimeofday(&tempo1, NULL);

}

void EndSysTimer() {

gettimeofday(&tempo2, NULL);

elapsed_seconds = tempo2.tv_sec - tempo1.tv_sec;

elapsed_useconds = tempo2.tv_usec - tempo1.tv_usec;

elapsed_utime = (elapsed_seconds) * 1000000 + elapsed_useconds;

elapsed_mtime = ((elapsed_seconds) * 1000 + elapsed_useconds/1000.0) + 0.5;

total_usec = total_usec + elapsed_utime;

total_msec = total_msec + elapsed_mtime;

}

void OutputTime() {

printf("Elapsed time = %ld microseconds\n", total_usec);

printf("Elapsed time = %ld milliseconds\n", total_msec);

}

Paper Abstract

- What is the problem?
- [Why is it important]?
- What is your solution?
- What is one going to find after reading your paper?

• What's the system about?
• Results

Flaky VMWare Server WebUI 2.0.2 workaround

VMWare Server 2.0.2 WebUI bug... this kind of reminds me of my EMC days!! similar infrastructure, unbelievably similar UI and interestingly, similar bugs too :-D

http://ip-forum.net/forum/index.php?topic=830.0;wap2

Common Errors in English Usage

http://www.wsu.edu/~brians/errors/errors.html#errors

An Interview With Edsger W. Dijkstra

http://cacm.acm.org/magazines/2010/8/96632-an-interview-with-edsger-w-dijkstra/fulltext

Add a system independent sleep/clock to your program

Add a system independent sleep/clock to your program

http://www.faqs.org/faqs/unix-faq/faq/part4/section-6.html

extern int        select();

     int
     usleep( usec )                            /* returns 0 if ok, else -1 */
           long                usec;           /* delay in microseconds */
           {
           static struct                       /* `timeval' */
                   {
                   long        tv_sec;         /* seconds */
                   long        tv_usec;        /* microsecs */
                   }   delay;          /* _select() timeout */

           delay.tv_sec = usec / 1000000L;
           delay.tv_usec = usec % 1000000L;

           return select( 0, (long *)0, (long *)0, (long *)0, &delay );
           }

Cool ways of adding numbers in a text file in bash:

awk '{s+=$0} END {print s}' /tmp/file.txt

paste -sd+ /tmp/file.txt | bc

Source: http://unstableme.blogspot.com/2009/11/sum-of-numbers-in-file-unix.html

Problem with Fortran + C code compilation:

undefined reference to `iargc_'
undefined reference to `getarg_'


Solution: use '_gfortran_iargc()' and '_gfortran_getarg_i4()' instead of 'iargc_()' and 'getargc_()'. This is specific to the situation where you link C with Fortran.
On the cluster, these are defined in /usr/lib/gcc/x86_64-redhat-linux/4.1.2/libgfortran.a.

http://osdir.com/ml/gcc.fortran/2005-02/msg00297.html
http://old.nabble.com/getarg-and-iargc-in-gcc-4.0.2-td1803996.html

Other links on Fortran + C compilation:

http://www.fnal.gov/docs/UNIX/unix_a.../uatf-107.html
http://astro.berkeley.edu/~wright/f2c.html
http://www.yolinux.com/TUTORIALS/Lin...rtranAndC.html