Dear list,
On Tue, 2011-08-02 at 13:03 +0100, Clemens Vonrhein wrote:
> Dear Miguel,
>
> yes, I hit the same issue - and for me the machine then completely
> freezes and needs a reboot.
I wrote this mmap test (back when VMS was still supported by CCP4, and
porting CCP4 to Mac's was just an idea that got a laugh at the bar :-)).
> The patch for configure:
>
> --- configure.orig 2011-05-05 16:07:55.000000000 +0100
> +++ configure 2011-07-21 16:05:57.000000000 +0100
> @@ -3206,6 +3206,9 @@
> if test "$system" = sunos64; then
> xopts="$xopts --enable-64-bit=yes"
> fi
> + case `uname` in
> + Darwin*) xopts="$xopts --disable-mmap";;
> + esac
Doing this may result in excess memory consumption, so I can't recommend
it as a good workaround, and it seems to me that this test needs looking
at again. The source is in ccp4-6.2.0/lib/ccif/aclocal.m4, where I made
the following comment:
> /* Adapted from autoconf's standard HAVE_MMAP test in acspecific.m4 */
IIRC, the adaptation that I did was to check that the system's mmap(2)
function does not require the first argument to specify a starting
address for the mapping. These days, modern OS's all have an mmap
implementation that behaves in the required way, so the test as I
adapted it is arguably not needed any longer. OTOH, if there is an issue
with mmap over nfs on certain systems, some sort of test is still
needed, although a lot of mainstream applications use mmap all the time
(such as Emacs, Apache http server, etc. etc.). To my astonishment
though, there doesn't seem to be a standard autoconf test for mmap as it
is used in contemporary development, and the original of the test that I
adapted still checks for the old behaviour:
> -- Macro: AC_FUNC_MMAP
> If the `mmap' function exists and works correctly, define
> `HAVE_MMAP'. This checks only private fixed mapping of
> already-mapped memory.
(Checked on autoconf version 2.68)
On a quick test, I don't actually crash our OS X build system, but the
mmap test does fail. I don't have a lot of time to spend on this now,
but if anyone from CCP4 is interested in looking into this, please
contact me off-list.
Regards,
Peter.
--
Peter Keller Tel.: +44 (0)1223 353033
Global Phasing Ltd., Fax.: +44 (0)1223 366889
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