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Tuesday, September 9, 2003
![[Item Permalink]](http://radio.weblogs.com/0112083/images/ur_bullet.gif){kind=small} Updated collection of Mac OS X articles (in Finnish) -- Comment()
I noticed that Macsanomat pointed to my recently updated collection of Mac OS X articles (available in Finnish). These articles were published in the @CSC magazine.
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Testing the Fortran 90/95 compilers by IBM and Absoft (on Mac OS X) -- Comment()
I compared the speed of code generated by the IBM and Absoft Fortran 90/95 compilers on Mac OS X. The test code was an iterative solver for linear equations. The size of the system was 1600x1600, using a dense matrix formulation in double precision. In summary, the average time (in 20 runs for each compiler) to solve the 1600x1600 system was 1.7 seconds with the IBM compiler, and 2.1 seconds with the Absoft compiler. Thus, there was some difference in the speed, but the difference was not dramatical, only about 20% less cpu time with the IBM compiler. The Absoft compiler was version 7.0 (current is 8.0), and the IBM was 8.0 beta. For both compilers the optimization level was -O3. The tests were done on a 1 GHz PowerBook G4. By the way, this was quite respectable speed: on a Compaq AlphaServer ES45 with 1 GHz Alpha EV68 processors the run time was 2.6 seconds on average. There were several other appications running, so there was some variability in the cpu time taken for the different runs. I paused for 5 seconds between each comparison run. Half of the runs were made with IBM version first, half with Absoft version first. There was a pause of 8 seconds between each pair of runs. In all pairs of runs the code generated by the IBM Fortran compiler was faster than Absoft.
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Having a corner room is a pain -- Comment()
I'm a bit dissatisfied with my new room at work. At first I thought it was nice to have a corner room with two sets of windows. But then it turned out that I have less shelf space. This was not so bad: I discarded a third of my old things. A worse problem is that I used to have a big noteboard where I could stick photos of my family, important lists, etc. Now the windows take so much space I don't have that luxury.
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