[vtk-developers] Build VTK in 9 min 28 sec

[Andy Cedilnik]

Just a small addition:
The VTK I build had all the kits and Tcl wrapping. I used the following
flags: -Wall -W -g -O0. 

			Andy

On Mon, 2002-06-10 at 08:36, Andy Cedilnik wrote:
> A while ago I posted some timing results stating that I can build VTK in
> 18 minutes. What I did not say was that this was per processor time not
> clock time. I tested building VTK the "right" way:
> 
> STIME=$( python -c "import time; print time.time()" )
> echo -n " $STIME"
> make -j 2 &> /dev/null
> ETIME=$( python -c "import time; print time.time()" )
> echo -n " ... $ETIME"
> TTIME=$( python -c "print $ETIME - $STIME" )
> TTIMEM=$( python -c "print $TTIME / 60.0" )
> echo " = $TTIME s ( $TTIMEM min )
> 
> and it outputs:
> 
> 1023711532.46 ... 1023712100.54 = 568.079999924 s ( 9.46799999873 min )
> 
> So, this is clock time with overhead of calling python etc.
> 
> Now, just for your information:
> Dual AMD Athlon MP 1600+ (1.4 GHz)
> 1GB RAM
> No RAID SCSI Hard Drive
> Sourcerer Linux (kernel 2.4.17)
> Reiserfs
> gcc 2.95.3
> 
> Another small comment, last time I was doing make -j 10. I did a series
> of tests, where I ran the top script for make -j 1, 2, 3, 4, ... , 14
> and the result is that there is twice improvement when going from make
> -j 1 to make -j 2, but no improvement at all when going higher.
> 
> For non gmake people, make -j x means spawn x parallel builds.