#7968: fft2 benchmark sometimes fails (nofib) ----------------------------------------+----------------------------------- Reporter: jstolarek | Owner: Type: bug | Status: new Priority: normal | Component: NoFib benchmark suite Version: 7.7 | Keywords: Os: Linux | Architecture: x86_64 (amd64) Failure: Incorrect result at runtime | Blockedby: Blocking: | Related: ----------------------------------------+----------------------------------- 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 }}} -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7968 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler