On 4/24/2018 3:23 PM, Brian Bockelman wrote:
On Apr 24, 2018, at 3:05 PM, Greg Thain <gthain@xxxxxxxxxxx
<mailto:gthain@xxxxxxxxxxx>> wrote:
On 04/24/2018 02:46 PM, Todd Tannenbaum wrote:
Hi all,
Currently our increasingly popular HTCondor python bindings are
implemented via Boost.Python. *Now that all HTCondor supported
platforms have C++11*-compatible compilers, I propose we consider
implementing our bindings via pybind11 [see below for description]
instead.
Note that RHEL6 doesn't fully support c++11.
pybind11 needs gcc 4.8 or VC++ 2015. RHEL 6 is gcc 4.4. RHEL 7 is
gcc 4.8.
I'm feeling increasing frustrated by the age of the default c++
compilers on RHEL. There are packages for EL that provide modern
gcc's that statically link in the c++ libraries, so that they run on
stock el6/7s. Perhaps this is a path we should consider, even though
it inconveniences our downstream friends?
Ugh. C++11. Who uses such an old language? :) (I work with people
who are cranky that we didn't switch to C++17 until last month)
Ugh indeed. Rar, I thought RHEL6 had enough C++11-isms to support
pybind11. I think this will have to wait until we know when we can
sunset RHEL6...
What's the remaining RHEL6 lifetime?
"Full support" for RHEL6 ended May 2016, and maintenance 1 support ended
back in May 2017. So as of today, RHEL6 does not even get support for
new device drivers -- essentially just security updates. You could buy
a server from Dell tomorrow that has hardware (RAID card, whatever) that
RHEL6 will not ever support. RHEL6 "Product retirement" is Nov 2020.
Can we do this changeover at
release boundaries? It feels like it's perhaps a bit early on that...
Otherwise, we could live with things ifdef'd between pybind11 and boost
for awhile. We are historically bad at ripping out old code, aren't we?
I guess I'd rather wait until we know when HTCondor can stop supporting
RHEL6, and then move at that time so we don't have to maintain ifdefs.
Esp if we can stop worrying about RHEL6 sooner rather than later. Any
wisdom with your OSG or CMS/WLCG hat on when RHEL6 can sunset?
regards,
Todd
--
Todd Tannenbaum <tannenba@xxxxxxxxxxx> University of Wisconsin-Madison
Center for High Throughput Computing Department of Computer Sciences
HTCondor Technical Lead 1210 W. Dayton St. Rm #4257
Phone: (608) 263-7132 Madison, WI 53706-1685
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