virtual_memory on FreeBSD

[iblislin]

I got this

In [9]: psutil.virtual_memory()
---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-9-5ca35f683e59> in <module>()
----> 1 psutil.virtual_memory()

/usr/home/iblis/venv/concurrent_ap/lib/python3.6/site-packages/psutil/__init__.py in virtual_memory()
   1983     """
   1984     global _TOTAL_PHYMEM
-> 1985     ret = _psplatform.virtual_memory()
   1986     # cached for later use in Process.memory_percent()
   1987     _TOTAL_PHYMEM = ret.total

/usr/home/iblis/venv/concurrent_ap/lib/python3.6/site-packages/psutil/_psbsd.py in virtual_memory()
    177 def virtual_memory():
    178     """System virtual memory as a namedtuple."""
--> 179     mem = cext.virtual_mem()
    180     total, free, active, inactive, wired, cached, buffers, shared = mem
    181     if NETBSD:

FileNotFoundError: [Errno 2] No such file or directory

[iblislin]

In [7]: platform.version()
Out[7]: 'FreeBSD 12.0-CURRENT #4 r309367: Mon Dec 12 11:10:09 CST 2016     root@abeing:/usr/obj/usr/src/sys/GENERIC'

[giampaolo]

Please try the followings in your shell:

sysctl hw.physmem
sysctl vm.stats.vm.v_active_count
sysctl vm.stats.vm.v_inactive_count
sysctl vm.stats.vm.v_wire_count
sysctl vm.stats.vm.v_cache_count
sysctl vm.stats.vm.v_free_count
sysctl vfs.bufspace

I expect one of these to fail.

[iblislin]

only vm.stats.vm.v_cache_count failed

└─[iblis@abeing]% sysctl vm.stats.vm.v_cache_count
sysctl: unknown oid 'vm.stats.vm.v_cache_count'

[iblislin]

releated commit?
https://lists.freebsd.org/pipermail/svn-src-head/2016-December/094350.html

[giampaolo]

OK I should have fixed it. Could you give it a try by using latest GIT version?

[iblislin]

I found this commit remove it: https://svnweb.freebsd.org/base?view=revision&revision=309017

[giampaolo]

Nice find. It looks like they removed it 'cause the value was always set to 0 since god knows when. It probably makes sense to remove it from psutil as well. I don't think it's gonna be a big deal in terms of backward compatibility.

[iblislin]

@giampaolo The patch works fine!

[giampaolo]

Actually, since cached memory may be correctly calculated on NetBSD and OpenBSD, I think it's better to leave it in place and set it to 0 if it fails.

[iblislin]

👌