On 12/5/10 10:24 PM, Garrett Cooper wrote:
On Sun, Dec 5, 2010 at 10:22 PM, Julian Elischer<jul...@freebsd.org> wrote:
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...
But couldn't it be libthr changes? There have been a handful of
those that have been committed recently by davidxu.
Unlikely as there was no mention of there being any thread involvement.
probably just replacing the kernel would be enough..
It'd be easy to find out.. see if one 2 weeks old fixes the problem :-)
HTH,
-Garrett
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