Re: Profiling bug in 6.10.4

Hi Krzysztof, On 3/22/10 2:42 PM, Krzysztof Skrzętnicki wrote:

I got some results from GHC 6.12.1, Linux i686. In short: both profiling and normal run produce the same final results, but there are some differences. I don't know if they are valid or not.

./nsyn | tail 1080826.599 0.01 8.483e-15 7.612e-1 7.753e-5 2.517e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1134406.808 0.01 6.911e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1191190.672 0.01 5.615e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1251481.495 0.01 4.548e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1315638.396 0.01 3.671e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1384093.315 0.01 2.952e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1457375.318 0.01 2.364e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1535826.102 0.01 1.884e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1619603.195 0.01 1.495e-15 7.612e-1 7.753e-5 2.514e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1709306.677 0.01 1.180e-15 7.612e-1 7.753e-5 2.514e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16

./nsyn-prof | tail 1080826.599 0.01 8.483e-15 7.612e-1 7.753e-5 2.517e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1134406.808 0.01 6.911e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1191190.672 0.01 5.615e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1251481.495 0.01 4.548e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1315638.396 0.01 3.671e-15 7.612e-1 7.753e-5 2.516e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1384093.315 0.01 2.952e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1457375.318 0.01 2.364e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1535826.102 0.01 1.884e-15 7.612e-1 7.753e-5 2.515e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1619603.195 0.01 1.495e-15 7.612e-1 7.753e-5 2.514e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16 1709306.677 0.01 1.180e-15 7.612e-1 7.753e-5 2.514e-7 1.566e-5 2.387e-1 3.089e-14 6.337e-11 5.791e-11 5.665e-16

Best regards

Krzysztof Skrzętnicki

2010/3/22 Gregory Wright:

...

Hi,

On 3/22/10 10:22 AM, Gregory Wright wrote:

...

Hi,

I have a program (attached) that is relatively simple, but numerically intensive. It computes the abundances of the chemical elements generated by big-bang nucleosynthesis. At the moment, the executable takes no command line arguments, it simply runs the standard model.

When I build the program without profiling, it produces the right answer. When I build it with profiling (runhaskell configure --enable-executable-profiling) it runs without error, but gives completely incorrect numerical results. I'm using ghc 6.10.4 built from source using MacPorts.

The program is mostly self contained, but uses the hmatrix package to solve a linear system. Note also that the "Vector" type is hmatrix's Data.Packed.Vector and not the one from the more familiar "vector" package.

I was wondering whether this profiling problem is known.

Best Wishes, Greg

The previously attach tarball was missing most of its contents, courtesy of my ham-fisted emacs technique. The tarball attached to this message has been tested by building and shows the problem mentioned above.

-Greg

Now they seem to both be correct. The key value is at the bottom of column 8. This should be 2.386e-1 (which means that 23.86 percent of the protons in the early universe end up as helium). So it seems that this is a problem either with 6.10.4, or with OS X. Quite strange. I will try to get 6.12 building on my machine to see if the problem persists. -Greg