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Re: Octave 3.4.3-rc0 release candidate available for ftp


From: Michael D Godfrey
Subject: Re: Octave 3.4.3-rc0 release candidate available for ftp
Date: Sat, 01 Oct 2011 15:59:45 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/30/2011 11:43 AM, Michael D Godfrey wrote:
On 09/30/2011 09:58 AM, Michael D Godfrey wrote:
On 09/30/2011 09:22 AM, Michael D Godfrey wrote:
On Fedora fc15, x86_64 I get a similar failure with the devel
branch:

439: !!!!! test failed
 440: assert (fftfilt (b, r * x),r * r * [1, 1, 0, 0, 0, 0, 0, 0, 0, 0],eps) expected
 441:  Columns 1 through 5:
 442:    0.00000 + 1.00000i   0.00000 + 1.00000i   0.00000 + 0.00000i   0.00000 + 0.00000i   0.00000 + 0.00000i
 443:  Columns 6 through 10:
 444:    0.00000 + 0.00000i   0.00000 + 0.00000i   0.00000 + 0.00000i   0.00000 + 0.00000i   0.00000 + 0.00000i
 445: but got
 446:  Columns 1 through 5:
 447:    0.00000 + 1.00000i   0.00000 + 1.00000i   0.00000 - 0.00000i  -0.00000 + 0.00000i  -0.00000 + 0.00000i
 448:  Columns 6 through 10:
 449:    0.00000 + 0.00000i  -0.00000 + 0.00000i   0.00000 - 0.00000i  -0.00000 + 0.00000i  -0.00000 + 0.00000i
 450: maximum absolute error 2.22478e-16 exceeds tolerance 2.22045e-16
=============================================

Exact same devel branch on fc14 does not fail this test.  Will try to
isolate the problem.

Michael
One difference between fc14 and fc15:
fc14:  fftw-3.2.2-4.fc13.x86_64

fc15: fftw-3.2.2-5.fc15.x86_64
===========================
If the fc14 rpm will install on fc15, I will try that.

Michael
Also, the following gcc change:
fc14: gcc-4.5.1-4.fc14.x86_64

fc15: gcc-4.6.1-9.fc15.x86_64

The affects the whole set of gcc stuff.

So, there are a number of possible sources for this problem...

Michael
I have just tried this on another fc15 system.  It runs make check with no errors.
The only known additional difference between the 2 systems is:

1. System that fails is:               model name    : Dual Core AMD Opteron(tm) Processor 275
2. System that passes is:        model name      : Intel(R) Core(TM) i7 CPU         860  @ 2.80GHz

But, the system which fails passed until recently.  And, of course, there may be other
software differences despite the fact that both systems are up-to-date fc15.

Since the one make check failure is within a very small margin of eps, I think this should
not be considered to be more that a curious anomaly.

Michael


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