Hi,
maybe later if the stuff is more stable. The autoconf checks are
already there, its just a matter of changing the default later on.
/// Jürgen
On 04/04/2014 04:31 PM, Elias Mårtenson wrote:
Wouldn't it make sense to check for OMP and enable it if it's found?
I'm currently looking into autoconf to figure out a way to do this.
Are you willing to take the patch if I do that?
Regards,
Elias
On 4 April 2014 22:30, Juergen Sauermann
<juergen.sauerm...@t-online.de <mailto:juergen.sauerm...@t-online.de>>
wrote:
Hi Elias,
if you ./configure nothing then MULTICORE will be #undef'ed and that
means OMP will be disabled. This is the default for backward
compatibility
so that GNU APL still compiles even if you don't have OMP installed.
For the behavior that you expect below,
.,/configure CORE_COUNT_WANTED=all
is the way to go.
/// Jürgen
On 04/04/2014 04:15 PM, Elias Mårtenson wrote:
Cool, thanks for this!
Can you clarify one thing: If you don't specify anything on the
command line, and also not specify anything at runtime, what will
the default be?
Casually, I'd expect it to be set to OMP enabled, with the core
count = the number of cores on the machine.
Regards,
Elias
On 4 April 2014 21:58, Juergen Sauermann
<juergen.sauerm...@t-online.de
<mailto:juergen.sauerm...@t-online.de>> wrote:
Hi,
I have added a few functions to support multi-core/open MP
programming
for GNU APL, (see SVN 184.
1. ./configure
You can now ./configure static and dynamic core counts:
./configure CORE_COUNT_WANTED=N with N>0
static maximum core count. Will
#define MULTICORE 1
#define STATIC_CORE_COUNT N
./configure CORE_COUNT_WANTED=0
no openMP support. Will
#undef MULTICORE
#define STATIC_CORE_COUNT 1
./configure CORE_COUNT_WANTED=-1 or =all
dynamic core count using all available cores. Will
#define MULTICORE 1
#undef STATIC_CORE_COUNT
./configure CORE_COUNT_WANTED=-2 or =argv
dynamic core count set by command line option --cc N.
Same as =all if --cc is not given. Will
#define MULTICORE 1
#undef STATIC_CORE_COUNT
./configure CORE_COUNT_WANTED=-3 or =syl
dynamic core count set in APL by ⎕SYL Will
#define MULTICORE 1
#undef STATIC_CORE_COUNT
The interpreter is started with core count 1.
Eg. ⎕SYL[26]←2 will set core count to 2.
⎕SYL[24;] is the core count used in in ./configure (read-only)
⎕SYL[25;] is the core count detected by
pthread_getaffinity_np() (read-only)
⎕SYL[26;] is the current core count (read-only unless
CORE_COUNT_WANTED=syl)
---------------------------------------------------------------------------------
In the interpreter code, the above #defines become available by:
#include "Common.hh"
That also declares the following functions/macros:
CoreCount core_count() // return number of cores that will be
used
CoreCount max_cores() // return number of cores detected by
pthread_getaffinity_np()
CoreCount setup_cores(CoreCount new_count) // set new core
count, return min ( new_count, max_cores )
if STATIC_CORE_COUNT is #defined then core_count() is a macro
expanding to max ( CORE_COUNT_WANTED, 1).
In that case, max_cores() cores will be used and not
core_count() cores!
./configure checks for presence of omp.h and libgomp and sets
CXX flags in Makefiles.
omp.h is #included by Common.hh if present and needed (ie. if
MULTICORE is 1)
/// Jürgen
