covoar SIGKILL Investigation
Vijay Kumar Banerjee
vijaykumar9597 at gmail.com
Fri Aug 31 18:41:47 UTC 2018
On Sat, 1 Sep 2018 at 00:01, Joel Sherrill <joel at rtems.org> wrote:
>
>
> On Fri, Aug 31, 2018, 12:44 PM Vijay Kumar Banerjee <
> vijaykumar9597 at gmail.com> wrote:
>
>> Hello,
>> I have listed all the specific exes for which covoar fails.
>> I have observed that covoar fails only for some specific exe for some
>> symbol-sets,
>> this was the reason for covoar not completing successfully. If we exclude
>> these exe,
>> covoar finishes successfully for the whole testsuites. So the prolem has
>> become more
>> specific now, we'll have to investigate for only these exe.
>>
>> Here's the list of all the symbol-sets that were failing, along with the
>> exe files that made them
>> trip.
>>
>> -----------------------
>> posix ----
>> sptests/spmutex01.exe
>> fstests/fsclose01.exe
>>
>> sapi ----
>> sptests/spversion01.exe
>>
>> librfs ----
>> fstests/mrfs_fserror.exe
>> fstests/mrfs_fsrdwr.exe
>> (all fstests/mrfs_*.exe fails)
>> fstests/fsrofs01.exe
>> libtests/flashdisk01.exe
>>
>> libdevnull ----
>> sptests/sp21.exe
>> psxtests/psxmmap01.exe
>> tmtests/tm20.exe
>>
>> libblock ----
>> fstests/fsbdpart01.exe
>> ---------------------
>>
>
> Thanks.
>
> Have you had a chance to try get with catch throw?
>
I'm trying it now with posix and fsclose01.exe, here's what I see.
------------------------------------
Catchpoint 1 (exception thrown), 0x00007ffff7ad7f51 in
__cxxabiv1::__cxa_throw (obj=obj at entry=0x832c80,
tinfo=tinfo at entry=0x488a70 <typeinfo for rld::error>,
dest=dest at entry=0x40f980
<rld::error::~error()>)
at ../../../../libstdc++-v3/libsupc++/eh_throw.cc:78
78 PROBE2 (throw, obj, tinfo);
(gdb) bt
#0 0x00007ffff7ad7f51 in __cxxabiv1::__cxa_throw (obj=obj at entry=0x832c80,
tinfo=tinfo at entry=0x488a70 <typeinfo for rld::error>,
dest=dest at entry=0x40f980 <rld::error::~error()>) at
../../../../libstdc++-v3/libsupc++/eh_throw.cc:78
#1 0x0000000000405926 in Coverage::ExecutableInfo::findCoverageMap
(this=<optimized out>, symbolName="wait")
#2 0x000000000041bc1d in
Coverage::finalizeSymbol(Coverage::ExecutableInfo*,
std::__cxx11::basic_string<char, std::char_traits<char>,
std::allocator<char> >&,
std::__cxx11::list<Coverage::ObjdumpProcessor::objdumpLine_t,
std::allocator<Coverage::ObjdumpProcessor::objdumpLine_t> >)
() at ../tester/covoar/ObjdumpProcessor.cc:35
#3 0x000000000041c9e6 in
Coverage::ObjdumpProcessor::load(Coverage::ExecutableInfo*,
rld::process::tempfile&, rld::process::tempfile&) ()
at /usr/include/c++/8/new:169
#4 0x000000000040e058 in covoar(int, char**) () at
../tester/covoar/covoar.cc:381
#5 0x000000000040bacc in main () at ../tester/covoar/covoar.cc:563
#6 0x00007ffff70fd1bb in __libc_start_main (main=0x40b9b0 <main>, argc=11,
argv=0x7fffffffd4b8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffd4a8) at
../csu/libc-start.c:308
#7 0x000000000040c32a in _start () at ../tester/covoar/covoar.cc:593
------------------------------------
>
>>
>> On Wed, 22 Aug 2018 at 21:11, Vijay Kumar Banerjee <
>> vijaykumar9597 at gmail.com> wrote:
>>
>>> I will send the attachment offlist as it's too big for the list.
>>> On Wed, 22 Aug 2018 at 21:07, Vijay Kumar Banerjee <
>>> vijaykumar9597 at gmail.com> wrote:
>>>
>>>> The coverage for whole testsuite completed successfully,
>>>> I have attached the zip file here and also included the js and css
>>>> files in it.
>>>>
>>>> coverage didn't complete for the following symbol-set libraries and was
>>>> returning,
>>>> covoar error 10
>>>>
>>>> * libsapi.a
>>>> * libposix.a
>>>> * librfs.a
>>>> * libcsupport.a
>>>> * libdevnull.a
>>>> * libblock.a
>>>>
>>>>
>>>> On Wed, 22 Aug 2018 at 10:22, Chris Johns <chrisj at rtems.org> wrote:
>>>>
>>>>> On 22/08/2018 14:41, Joel Sherrill wrote:
>>>>> > On Tue, Aug 21, 2018, 10:26 PM Chris Johns <chrisj at rtems.org
>>>>> > <mailto:chrisj at rtems.org>> wrote:
>>>>> >
>>>>> > On 22/08/2018 09:29, Joel Sherrill wrote:
>>>>> > > On Tue, Aug 21, 2018, 4:05 PM Vijay Kumar Banerjee
>>>>> > <vijaykumar9597 at gmail.com <mailto:vijaykumar9597 at gmail.com>
>>>>> > > <mailto:vijaykumar9597 at gmail.com <mailto:
>>>>> vijaykumar9597 at gmail.com>>> wrote:
>>>>> > > On Wed, 22 Aug 2018 at 01:55, Joel Sherrill <
>>>>> joel at rtems.org
>>>>> > <mailto:joel at rtems.org>
>>>>> > > <mailto:joel at rtems.org <mailto:joel at rtems.org>>> wrote:
>>>>> > >
>>>>> > > How long is covoar taking for the entire set?
>>>>> > >
>>>>> > > It works great. this is what `time` says
>>>>> > > --------
>>>>> > > real17m49.887s
>>>>> > > user14m25.620s
>>>>> > > sys0m37.847s
>>>>> > > --------
>>>>> > >
>>>>> > > What speed and type of processor do you have?
>>>>> > >
>>>>> >
>>>>> > The program is single threaded so the preprocessing of each
>>>>> executable is
>>>>> > sequential. Memory usage is reasonable so there is no swapping.
>>>>> >
>>>>> > Running covoar from the command line on a box with:
>>>>> >
>>>>> > hw.machine: amd64
>>>>> > hw.model: Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz
>>>>> > hw.ncpu: 16
>>>>> > hw.machine_arch: amd64
>>>>> >
>>>>> > plus 32G of memory has a time of:
>>>>> >
>>>>> > 366.32 real 324.97 user 41.33 sys
>>>>> >
>>>>> > The approximate time break down is:
>>>>> >
>>>>> > ELF/DWARF loading : 110s (1m50s)
>>>>> > Objdump : 176s (2m56s)
>>>>> > Processing : 80s (1m20s)
>>>>> >
>>>>> >
>>>>> > I don't mind this execution time for the near future. It is far from
>>>>> obscene
>>>>> > after building and running 600 tests.
>>>>>
>>>>> Yeah, there are other things we need to do first.
>>>>>
>>>>> > The DWARF loading is not optimised and I load all source line to
>>>>> address maps
>>>>> > and all functions rather that selectively scanning for specific
>>>>> names at the
>>>>> > DWARF level. It is not clear to me scanning would be better or
>>>>> faster.
>>>>> >
>>>>> > I doubt it is worth the effort. There should be few symbols in an
>>>>> exe we don't
>>>>> > care about. Especially once we start to worry about libc and libm.
>>>>>
>>>>> Yeah, this is what I thought at the start.
>>>>>
>>>>> > My hope
>>>>> > is moving to Capstone would help lower or remove the objdump
>>>>> overhead. Then
>>>>> > there is threading for the loading.
>>>>> >
>>>>> > > I don't recall it taking near this long in the past. I used to
>>>>> run it as
>>>>> > part of
>>>>> > > development.
>>>>> >
>>>>> > The objdump processing is simpler than before so I suspect the
>>>>> time would have
>>>>> > been at least 4 minutes.
>>>>> >
>>>>> > > But we may have more tests and the code has changed.
>>>>> >
>>>>> > I think having more tests is the dominant factor.
>>>>> >
>>>>> > > Reading dwarf
>>>>> > > with the file open/closes, etc just may be more expensive than
>>>>> parsing the
>>>>> > text
>>>>> > > files.
>>>>> >
>>>>> > The reading DWARF is a cost and at the moment it is not
>>>>> optimised but it is only
>>>>> > a cost because we still parse the objdump data. I think opening
>>>>> and closing
>>>>> > files is not a factor.
>>>>> >
>>>>> > The parsing the objdump is the largest component of time. Maybe
>>>>> using Capstone
>>>>> > with the ELF files will help.
>>>>> >
>>>>> > > But it is more accurate and lays the groundwork.for more types
>>>>> of analysis.
>>>>> >
>>>>> > Yes and think this is important.
>>>>> >
>>>>> > +1
>>>>> >
>>>>> > > Eventually we will have to profile this code. Whatever is
>>>>> costly is done for
>>>>> > > each exe so there is a multiplier.
>>>>> > >
>>>>> > > I suspect this code would parallelize reading info from the
>>>>> exes fairly well.
>>>>> >
>>>>> > Agreed.
>>>>> >
>>>>> > Might be a good case for C++11 threads if one of the thread
>>>>> container classes is
>>>>> > a nice pool.
>>>>>
>>>>> Good idea. I think we need to look at some of the global object
>>>>> pointers before
>>>>> we head down this path.
>>>>>
>>>>> > And we might have some locking to account for in core data
>>>>> structures. Are STL
>>>>> > container instances thread safe?
>>>>>
>>>>> We need to manage all locking.
>>>>>
>>>>> > But an addition after feature stable relative to old output plus
>>>>> Capstone.
>>>>>
>>>>> Agreed.
>>>>>
>>>>> > > Merging the info and generating the reports not well due to
>>>>> data contention.
>>>>> >
>>>>> > Yes.
>>>>> >
>>>>> > > But optimizing too early and the wrong way is not smart.
>>>>> >
>>>>> > Yes. We need Capstone to be added before this can happen.
>>>>> >
>>>>> > +1
>>>>> >
>>>>> > I would also like to see gcov support but that will not be a factor
>>>>> in the
>>>>> > performance we have. It will add reading a lot more files (gcno) and
>>>>> writing a
>>>>> > lot of gcda at the end. Again more important to be right than fast
>>>>> at first. And
>>>>> > completely an addition.
>>>>>
>>>>> Agreed.
>>>>>
>>>>> Chris
>>>>>
>>>>
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