fft2 benchmark sometimes fails (nofib)

I noticed that sometimes fft2 program in nofib benchmark suite returns values that are slightly different from expected (see error message at the end of this report). The most worrying for me is that it sometimes works properly and sometimes fails, as if the correctness of result depended on some random factor.

././fft2 512 < /dev/null
expected stdout not matched by reality
--- fft2.stdout7        2013-05-15 08:01:24.014049002 +0200
+++ /tmp/runtest10927.1 2013-06-04 18:06:08.401977002 +0200
@@ -1,3 +1,3 @@
-result1 = 2.59635799135966e-12
-result2 = 2.59635799135966e-12
-result3 = 4.8279900966008427e-8
+result1 = 2.6712796173433053e-12
+result2 = 2.6712796173433053e-12
+result3 = 4.827444399779779e-8

real    0m0.055s
user    0m0.049s
sys     0m0.005s
././fft2 512 < /dev/null
expected stdout not matched by reality
--- fft2.stdout7        2013-05-15 08:01:24.014049002 +0200
+++ /tmp/runtest10963.1 2013-06-04 18:06:08.507977002 +0200
@@ -1,3 +1,3 @@
-result1 = 2.59635799135966e-12
-result2 = 2.59635799135966e-12
-result3 = 4.8279900966008427e-8
+result1 = 2.6712796173433053e-12
+result2 = 2.6712796173433053e-12
+result3 = 4.827444399779779e-8

real    0m0.054s
user    0m0.047s
sys     0m0.005s
././fft2 512 < /dev/null
expected stdout not matched by reality
--- fft2.stdout7        2013-05-15 08:01:24.014049002 +0200
+++ /tmp/runtest10999.1 2013-06-04 18:06:08.602977002 +0200
@@ -1,3 +1,3 @@
-result1 = 2.59635799135966e-12
-result2 = 2.59635799135966e-12
-result3 = 4.8279900966008427e-8
+result1 = 2.6712796173433053e-12
+result2 = 2.6712796173433053e-12
+result3 = 4.827444399779779e-8

real    0m0.052s
user    0m0.044s
sys     0m0.007s
././fft2 512 < /dev/null
expected stdout not matched by reality
--- fft2.stdout7        2013-05-15 08:01:24.014049002 +0200
+++ /tmp/runtest11035.1 2013-06-04 18:06:08.712977002 +0200
@@ -1,3 +1,3 @@
-result1 = 2.59635799135966e-12
-result2 = 2.59635799135966e-12
-result3 = 4.8279900966008427e-8
+result1 = 2.6712796173433053e-12
+result2 = 2.6712796173433053e-12
+result3 = 4.827444399779779e-8

real    0m0.052s
user    0m0.046s
sys     0m0.006s
././fft2 512 < /dev/null
expected stdout not matched by reality
--- fft2.stdout7        2013-05-15 08:01:24.014049002 +0200
+++ /tmp/runtest11071.1 2013-06-04 18:06:08.816977002 +0200
@@ -1,3 +1,3 @@
-result1 = 2.59635799135966e-12
-result2 = 2.59635799135966e-12
-result3 = 4.8279900966008427e-8
+result1 = 2.6712796173433053e-12
+result2 = 2.6712796173433053e-12
+result3 = 4.827444399779779e-8
make[2]: *** [runtests] Błąd 1
Failed making all in fft2: 1
make[1]: *** [all] Błąd 1
Failed making all in spectral: 1
make: *** [all] Błąd 1

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	NoFib benchmark suite
Test case
Differential revisions
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