Linux /dev/shm

[Jason Bacon]

On 12/31/14 17:31, Chagin Dmitry wrote:
> On Wed, Dec 31, 2014 at 04:33:08PM -0600, Jason Bacon wrote:
>> On 12/30/14 12:54, Miguel Clara wrote:
>>> On 30 December 2014 06:46:40 WET, Chagin Dmitry <dchagin at freebsd.org> wrote:
>>>> On Mon, Dec 29, 2014 at 08:49:08PM -0600, Jason Bacon wrote:
>>>>> Not sure where else to ask this:
>>>>>
>>>>> I'm trying to run Atomistix (http://www.quantumwise.com/) on FreeBSD
>>>> 10.1.
>>>>> The installer runs without a hitch, but I've run into issues with one
>>>> of
>>>>> the main binaries, vnl_exec.
>>>>>
>>>>> First problem was a missing libgomp.  linux-c6-devtools installs a
>>>>> dangling link in:
>>>>>
>>>>> /compat/linux/usr/lib/gcc/i686-redhat-linux/4.4.4/libgomp.so
>>>>>
>>>>> I fixed this by patching the port to include
>>>> libgomp-4.4.7-11.el6.i686.rpm.
>>>>> That got vnl_exec past all the link errors, but now I'm running into
>>>> this:
>>>>> Traceback (most recent call last):
>>>>>      File "<string>", line 1, in <module>
>>>>>      File "./zipdir/NL/__init__.py", line 17, in <module>
>>>>>      File "./zipdir/NL/ComputerScienceUtilities/Singleton.py", line
>>>> 120,
>>>>> in <module>
>>>>>      File "./build/lib/python2.7/multiprocessing/__init__.py", line
>>>> 183,
>>>>> in RLock
>>>>>      File "./build/lib/python2.7/multiprocessing/synchronize.py", line
>>>>> 172, in __init__
>>>>>      File "./build/lib/python2.7/multiprocessing/synchronize.py", line
>>>> 75,
>>>>> in __init__
>>>>> OSError: [Errno 38] Function not implemented
>>>>>
>>>>>    From what I've found on the Linux forums, this is indicating that
>>>> the
>>>>> app requires a tmpfs mounted on /dev/shm as an IPC interface. Is
>>>> there
>>>>> any way to emulate this on FreeBSD?
>>>>>
>>>> yes, see r218497 commit description. it seems to me that you should
>>>> mount tmpfs somewhere
>>> You can use devfs.conf for this, add:
>>> link /tmp shm
>>>
>>> Hope that helps,
>>> Miguel
>>>
>>>
>> Got it working.  There was a minor configuration issue preventing shm
>> from working.  I also had to create a linux-c6-libudev port, which I'll
>> submit along with an atomistix-installer port (like
>> math/matlab-installer) once I've done more thorough testing.
>>
> nice, however, can u try without defvs magic? glibc look through /proc/mounts
> to find tmpfs mount point if cant find /dev/shm.
I assume you mean simply removing the /dev/shm link, but leaving tmpfs 
mounted on /tmp, and that you mean /compat/linux/proc/mounts. If I do 
that, I get the "error 38" again.

Both proc and linproc are mounted and tmpfs is in proc/mounts:

FreeBSD manatee.acadix bacon ~ 401: df
Filesystem      Size    Used   Avail Capacity  Mounted on
/dev/ada0p3     447G     17G    394G     4%    /
devfs           1.0K    1.0K      0B   100%    /dev
procfs          4.0K    4.0K      0B   100%    /proc
linprocfs       4.0K    4.0K      0B   100% /compat/linux/proc
tmpfs           4.7G     16K    4.7G     0%    /tmp
sculpin:/usr    222G    162G     42G    79% /.amd_mnt/sculpin/host
FreeBSD manatee.acadix bacon ~ 402: more /compat/linux/proc/mounts
/dev/ada0p3 / ufs rw 0 0
devfs /dev devfs rw 0 0
proc /proc proc rw 0 0
tmpfs /tmp tmpfs rw 0 0
pid678 at manatee:/host /host nfs rw 0 0
pid678 at manatee:/net /net nfs rw 0 0
sculpin:/usr /.amd_mnt/sculpin/host nfs rw 0 0

Happy New Year,

     JB

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   Jason W. Bacon
   jwbacon at tds.net

   Circumstances don't make a man:
   They reveal him.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~