Re: how to build libradosstriper

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Hi Brad, 

You are correct. the librados.so has the symbol but what I copied is a wrong file. 
Now I can test the striper api with the previous C example and this cpp example: http://mrbojangles3.github.io/ceph/systems/striping/alignment/2017/05/28/Ceph-Stripe/
Both are working, but I haven't got any performance number yet. 
ps. I also found that the stripe unit must be set before object_size properly. 

Thanks much. 

Best,
Jialin
NERSC


On Tue, May 29, 2018 at 7:11 PM, Brad Hubbard <bhubbard@xxxxxxxxxx> wrote:
On Wed, May 30, 2018 at 11:52 AM, Jialin Liu <jalnliu@xxxxxxx> wrote:
> Thanks Brad,
> I run nm on those .so file, it prints 'no symbol'

OK, well you need to link to a library that exports that symbol (has
it defined in its Text section). I suspect you'll find it is defined
in libceph-common.so so try linking to that explicitly.

>
> Then with ldd librados.so, I don't see the libceph-common.so, instead:
>>
>>         jialin@cori12: ldd librados.so
>> linux-vdso.so.1 (0x00002aaaaaacf000)
>> libboost_thread-mt.so.1.53.0
>> =>/rados_install/lib/libboost_thread-mt.so.1.53.0 (0x00002aaaad24d000)
>> libboost_system-mt.so.1.53.0 =>
>> /rados_install/lib/libboost_system-mt.so.1.53.0 (0x00002aaaad464000)
>> libssl3.so => /usr/lib64/libssl3.so (0x00002aaaad668000)
>> libsmime3.so => /usr/lib64/libsmime3.so (0x00002aaaad8b4000)
>> libnss3.so => /usr/lib64/libnss3.so (0x00002aaaadadb000)
>> libnssutil3.so => /usr/lib64/libnssutil3.so (0x00002aaaaddfe000)
>> libplds4.so => /usr/lib64/libplds4.so (0x00002aaaae02c000)
>> libplc4.so => /usr/lib64/libplc4.so (0x00002aaaae230000)
>> libnspr4.so => /usr/lib64/libnspr4.so (0x00002aaaae435000)
>> libpthread.so.0 => /lib64/libpthread.so.0 (0x00002aaaae673000)
>> libdl.so.2 => /lib64/libdl.so.2 (0x00002aaaae890000)
>> libuuid.so.1 => /usr/lib64/libuuid.so.1 (0x00002aaaaea94000)
>> librt.so.1 => /lib64/librt.so.1 (0x00002aaaaec99000)
>> libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002aaaaeea1000)
>> libm.so.6 => /lib64/libm.so.6 (0x00002aaaaf22a000)
>> libc.so.6 => /lib64/libc.so.6 (0x00002aaaaf527000)
>> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002aaaaf8c8000)
>> libz.so.1 => /lib64/libz.so.1 (0x00002aaaafadf000)
>> /lib64/ld-linux-x86-64.so.2 (0x00002aaaaaaab000)

Things were obviously different in jewel but the concept remains the
same. For each external symbol your binary requires you need to link
to a library that exports that symbol so finding the library that
exports the symbols in the error message should resolve the error.

>
>
> I also found this thread: http://tracker.ceph.com/issues/14788
> which looks similar to the error I run into, and that thread mentioned the
> version between the headers file and the .so file, I think in my case both
> of them are v10.2.10, which should ok.
>
> Best,
> Jialin,
>
> On Tue, May 29, 2018 at 6:17 PM, Brad Hubbard <bhubbard@xxxxxxxxxx> wrote:
>>
>> On Wed, May 30, 2018 at 10:42 AM, Jialin Liu <jalnliu@xxxxxxx> wrote:
>> > Hi,
>> > I'm trying to use the libradosstriper api, but having some trouble in
>> > linking to lradosstriper. I copied only the `required' libraries from an
>> > pre-installed ceph (10.2.10), and put them under my local directory
>> > /rados_install/lib and rados_install/include, on a linux machine.
>> >
>> > /rados_install/lib:
>> >>
>> >> libboost_date_time.so.1.53.0      libboost_system.so.1.53.0
>> >> libboost_filesystem-mt.so.1.53.0  libboost_thread-mt.so.1.53.0
>> >> libboost_filesystem.so.1.53.0     libcephfs.so.1.0.0
>> >> libboost_iostreams-mt.so.1.53.0
>> >> libboost_iostreams.so.1.53.0
>> >> libboost_random-mt.so.1.53.0      librados.so.2.0.0
>> >> libboost_regex.so.1.53.0          librados_tp.so.2.0.0
>> >> libboost_system-mt.so.1.53.0      libradosstriper.so.1.0.0
>> >> libcephfs.so   librados.so  libradosstriper.so
>> >
>> >
>> > /rados_install/include:
>> >>
>> >> |-- rados
>> >> |   |-- buffer.h -> ../buffer.h
>> >> |   |-- buffer_fwd.h -> ../buffer_fwd.h
>> >> |   |-- crc32c.h -> ../crc32c.h
>> >> |   |-- inline_memory.h -> ../inline_memory.h
>> >> |   |-- librados.h
>> >> |   |-- librados.hpp
>> >> |   |-- librgw.h
>> >> |   |-- memory.h -> ../memory.h
>> >> |   |-- objclass.h
>> >> |   |-- page.h -> ../page.h
>> >> |   |-- rados_types.h
>> >> |   |-- rados_types.hpp
>> >> |   `-- rgw_file.h
>> >> `-- radosstriper
>> >>     |-- libradosstriper.h
>> >>     `-- libradosstriper.hpp
>> >
>> >
>> > The test code is simple, as attached, and I compiled it with dynamic
>> > linking:
>> >>
>> >> cc -L/rados_install/lib -I/rados_install/include -o librados_test
>> >> librados_test.c -lrados -lradosstriper
>> >
>> >
>> > But got the following message, can anyone plz advise?
>> >
>> >>
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::ptr::ptr(ceph::buffer::ptr&&)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::ptr::operator=(ceph::buffer::ptr&&)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `librados::IoCtx::remove(std::string const&, int)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::list::iterator::iterator(ceph::buffer::list*, unsigned
>> >> int)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::list::is_provided_buffer(char const*) const'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::list::append(ceph::buffer::ptr&&)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::list::iterator::iterator(ceph::buffer::list*, unsigned
>> >> int,
>> >> std::_List_iterator<ceph::buffer::ptr>, unsigned int)'
>> >> /rados_install/lib/libradosstriper.so: undefined reference to
>> >> `ceph::buffer::list::list(ceph::buffer::list&&)'
>>
>> Try doing the following in your lib directory.
>>
>> $ nm -A -C *.so|grep is_provided_buffer
>> libceph-common.so:0000000000223df0 T
>> ceph::buffer::list::is_provided_buffer(char const*) const
>> librados.so:00000000000bfef0 T
>> ceph::buffer::list::is_provided_buffer(char const*) const
>> libradosstriper.so:                 U
>> ceph::buffer::list::is_provided_buffer(char const*) const
>>
>> 'ldd librados.so' shows it links to libceph-common.so so I suspect you
>> may need that library.
>>
>> Don't forget that you need to tell the linker where to find these
>> libraries at runtime so you will need to pass something like
>> '-Wl,-rpath=/rados_install/lib' to the compiler so it finds the
>> correct versions of the libraries (you can check which ones it will
>> find with 'ldd librados_test'.
>>
>> HTH
>>
>> >
>> >
>> > Best,
>> > Jialin
>> > NERSC
>> >
>> > _______________________________________________
>> > ceph-users mailing list
>> > ceph-users@xxxxxxxxxxxxxx
>> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>> >
>>
>>
>>
>> --
>> Cheers,
>> Brad
>
>



--
Cheers,
Brad

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