Warnings and compile-time failure on 458.sjeng

Wed May 25 13:48:27 PDT 2016

On Wed, May 25, 2016 at 1:39 PM, Vedant Kumar <vsk at apple.com> wrote:

>
> > On May 25, 2016, at 1:20 PM, Xinliang David Li <davidxl at google.com>
> wrote:
> >
> >
> > On Wed, May 25, 2016 at 1:17 PM, Steven Wu <stevenwu at apple.com> wrote:
> > It is -O3 PGO for arm64 with training input.
> >
> > I am looking as well. Seems PData->Values is NULL but I don't know how
> yet.
>
> Steven sent me a core dump. I'll take a look at this to double-check the
> value of PData.
>
> >
> > With static allocation, this should not happen -- the field is
> statically initialized.
>
> But, we know static allocation is enabled because we get a warning from
> allocateOneNode().
>
> If enough warnings occur, is it possible for CurrentVNode to wrap around
> s.t:
>
>   COMPILER_RT_PTR_FETCH_ADD(ValueProfNode, CurrentVNode, 1) < EndVNode ?
>
> If this happens, allocateOneNode() can eventually return an incorrect
> VNode which will then be stored into PData->Values.
>

yes -- that is a problem by itself I will fix. Unlikely the reason here
though -- I only see very few warnings (not exceeding the limit).

David

>
> vedant
>
> >
> > David
> >
> >
> >
> > Steven
> >
> >> On May 25, 2016, at 1:06 PM, Xinliang David Li <davidxl at google.com>
> wrote:
> >>
> >> I could not reproduce the issue (only saw out of nodes warning). What
> additional option is used (I used O3)? What is the input (train, ref, test)?
> >>
> >> David
> >>
> >> On Wed, May 25, 2016 at 11:24 AM, Vedant Kumar <vsk at apple.com> wrote:
> >> Hi David,
> >>
> >> We're seeing another issue that we think is related to the recent
> static VP node allocation changes. Instrumented programs are hitting a
> segfault:
> >>
> >> ```
> >> 458.sjeng is fixed but 445.gobmk is broken.
> >> LLVM Profile Warning: Unable to track new values: Running out of static
> counters.  Consider using option -mllvm -vp-counters-per-site=<n> to
> allocate more value profile counters at compile time.
> >>
> /Users/buildslave/jenkins/workspace/Performance_ARM64_SPEC2006_INT-O3_LTO_PGO-master/spec2006/cur_run/nt/build/LNTBased/speccpu2006/int/445.gobmk/tools/timeit-target:
> error: child terminated by signal 11
> >> ```
> >>
> >> The backtrace is:
> >>
> >> ```
> >> * frame #0: 0x0000000100112f10
> 445.gobmk.simple`__llvm_profile_instrument_target + 132 at
> InstrProfilingValue.c:137
> >>     frame #1: 0x000000010007d528 445.gobmk.simple`shapes_callback + 2352
> >>     frame #2: 0x0000000100035b0c 445.gobmk.simple`matchpat_loop + 2088
> >>     frame #3: 0x0000000100034b38 445.gobmk.simple`matchpat_goal_anchor
> + 1124
> >>     frame #4: 0x000000010007cb0c 445.gobmk.simple`shapes + 384
> >>     frame #5: 0x0000000100029e4c 445.gobmk.simple`do_genmove + 2344
> >>     frame #6: 0x00000001000a5a48 445.gobmk.simple`gtp_gg_genmove + 216
> >>     frame #7: 0x0000000100099a6c 445.gobmk.simple`gtp_main_loop + 660
> >>     frame #8: 0x000000010009bd00 445.gobmk.simple`main + 7188
> >> ```
> >>
> >> In __llvm_profile_instrument_target(), it looks like we're failing the
> condition: CounterIndex < NumVSites.
> >>
> >> Do you mind taking a look?
> >>
> >> thanks,
> >> vedant
> >>
> >>
> >> > On May 23, 2016, at 12:29 PM, Xinliang David Li <davidxl at google.com>
> wrote:
> >> >
> >> > Fix is on the way.
> >> >
> >> > David
> >> >
> >> > On Mon, May 23, 2016 at 12:27 PM, Vedant Kumar <vsk at apple.com> wrote:
> >> >
> >> > > On May 23, 2016, at 12:19 PM, Xinliang David Li <davidxl at google.com>
> wrote:
> >> > >
> >> > >
> >> > >
> >> > > On Mon, May 23, 2016 at 12:15 PM, Vedant Kumar <vsk at apple.com>
> wrote:
> >> > > Hi David,
> >> > >
> >> > > I think one of the SPEC2006 tests doesn't have enough
> statically-allocated VP nodes per site. We're seeing:
> >> > >
> >> > > > "Child terminated by signal 25" (SIGXFSZ) after:
> >> > >
> >> > > Is this related?
> >> >
> >> > I don't think so. I suspect that's happening because the device is
> overloaded with logging info.
> >> >
> >> >
> >> > > >
> >> > > > LLVM Profile Warning: Running out of nodes:
> site_0 at func_12822962448227433604, value=4295054468
> >> > > > ...
> >> > > > LLVM Profile Warning: Running out of nodes:
> site_0 at func_12822962448227433604, value=4295052980
> >> > > > LLVM Profile Warning: Running out of nodes: site_0 at func_12822962
> /Users/buildslave/jenkins/workspace/Performance_ARM64_SPEC2006_INT-O3_LTO_PGO-master/spec2006/cur_run/nt/build/LNTBased/speccpu2006/int/458.sjeng
> >> > >
> >> > > It seems like the fix for now is to either tweak
> vp-counters-per-site for the test or to set -vp-static-alloc=false.
> >> > >
> >> > > In the long term, do you think it's worth adjusting
> vp-counters-per-site s.t we can run SPEC without modifications? If so, is
> SPEC the right testbed?
> >> > >
> >> > > Rong had helped collecting SPEC related statistics, but looks like
> there is something missing.  I will investigate. In the meantime, can you
> try the workaround?
> >> >
> >> > Yes, we'll do that.
> >> >
> >> > Here's all the logging info from our bot:
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > thanks,
> >> > vedant
> >> >
> >> >
> >> > >
> >> > > thanks,
> >> > >
> >> > > David
> >> > >
> >> > >
> >> > > thanks,
> >> > > vedant
> >> > >
> >> >
> >> >
> >> >
> >>
> >>
> >
> >
>
>
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