Date: Sun, 5 Dec 2010 15:18:29 -0800 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: freebsd-current@freebsd.org Subject: Process accounting/timing has broken recently Message-ID: <20101205231829.GA68156@troutmask.apl.washington.edu>
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Sometime in the last 7-10 days, some one made a
change that has broken process accounting/timing.
laptop:kargl[42] foreach i ( 0 1 2 3 4 5 6 7 8 9 )
foreach? time ./testf
foreach? end
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
69.55 real 38.39 user 30.94 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
68.82 real 40.95 user 27.60 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
69.14 real 38.90 user 30.02 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
68.79 real 40.59 user 27.99 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
68.93 real 39.76 user 28.96 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
68.71 real 41.21 user 27.29 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
69.05 real 39.68 user 29.15 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
68.99 real 39.98 user 28.80 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
69.02 real 39.64 user 29.16 sys
Max ULP: 0.501607 for x in [-18.000000:88.709999] with dx = 1.067100e-04
69.38 real 37.49 user 31.67 sys
testf is a numerically intensive program that tests the
accuracy of expf() in a tight loop. User time varies
by ~3 seconds on my lightly loaded 2 GHz core2 duo processor.
I'm fairly certain that the code does not suddenly grow/loose
6 GFLOP of operations.
--
Steve
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