By way of a background. I've been doing a review of the exting code
base looking at how to establishing a roadmap extend OPcache
functionality across all supported OSes and SAPIs. And this raises a
supplementary Q: which OSs and SAPIs should we be supporting for PHP 5.6
anyway? I would be interested in the views of the dev team on this.
It would be good to agree a list of which OSs are to be supported at PHP
5.6, which SAPIs are supported, and a matrix of which SAPIs are
supported on non-threaded and build TSRM variants.
Examples of what I am talking about are SAPIs with no clear evidence of
active support (I've listed the last non-bulk change in brackets to give
a measure of the level of support):
aolserver (2008), caudium (2005), continuity (2004), nsapi (2011),
phttpd (2002), pi3web (2003), roxon (2002), thttpd (2002),
tux (2007), webjames (2006)
I realise that some of these may still be actively used with a user
community out there wanting to track current versions, and this is just
a case of "if ain't broke..." However, I do wonder when some of these
were actively maintained and routinely tested against the current
versions at release -- and if not then perhaps PHP 5.6 is the correct
point to retire them from the source tarball and configure options?
Likewise in the Zend, TSRM, ext/opcache ... sources, there is
conditional code dependent on BeOS, __sgi, __osf__, __IRIX__, NSAPI,
PI3WEB, GNUPTH(*), OS_VXWORKS, etc. as well as obsolete BSD versions --
OSs that are no longer actively supported. Again I ask the Q how and
when are these tested and if not then shouldn't we retire this support?
Part of my reasons for asking this is work in preparation for OPcache
issue #118 -- Transparent SHM reuse. Doing this with robustly with good
performance characteristics -- for *all* currently referenced OSs -- is
a pain. Reviewing a range of other best-of breed packages which use
shared SMA-based resources, it seems to me that the memcached approach
is the cleanest: it uses the POSIX APIs and supports any OSes which
support these APIs. If we limited TSRM and OPcache support at PHP 5.6
to two code variants, POSIX + WIN32, surely this would still cover all
the major supported OSes?
//Terry Ellison
(*) GNU threads is still supported but it prevents utilisation of SMP
systems and there is a minimal performance differences from POSIX
threads on a single processor system.
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