On 12/5/10 10:19 PM, Garrett Cooper wrote:
On Sun, Dec 5, 2010 at 10:12 PM, Steve Kargl
<s...@troutmask.apl.washington.edu> wrote:
On Sun, Dec 05, 2010 at 04:00:32PM -0800, Julian Elischer wrote:
On 12/5/10 3:18 PM, Steve Kargl wrote:
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.
I know it's a lot to ask but it may be something that you can help
with if you
had the time to triangulate in on the change that did it..
I presume that since you are an "old hand" you can check out sources
at different revisions..
I was hoping that someone (possibly the person responsible) would
recognize the symptoms and recommend a revision or two to revert.
Otherwise, doing a binary search will take some time in that it
takes 4+ hours for a buildworld/kernel cycle on my laptop.
If you can provide the source for the application you're running
above and instructions on how to compile it, I can at least give you a
bit of a head start :).
Thanks,
-Garrett
plus which probably just
`cd /sys/amd64/conf config GENERIC;cd ../compile/GENERIC; make
kernel` would be enough...
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