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Remove all older OMP spec versioning from the runtime and build system.
Patch by Terry Wilmarth
Differential Revision: https://reviews.llvm.org/D64534
llvm-svn: 365963
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to reflect the new license. These used slightly different spellings that
defeated my regular expressions.
We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.
Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.
llvm-svn: 351648
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Patch by Simon Convent
Differential Revision: https://reviews.llvm.org/D38876
llvm-svn: 316234
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This patch doesn't affect D19878's context. So D19878 still cleanly applies.
llvm-svn: 270252
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This change adds a new entry point,
kmp_aligned_malloc(size_t size, size_t alignment), an entry point corresponding
to kmp_malloc() but with the capability to return aligned memory as well.
Other allocator routines have been adjusted so that kmp_free() can be used for
freeing memory blocks allocated by any kmp_*alloc() routine, including the new
kmp_aligned_malloc() routine.
Differential Revision: http://reviews.llvm.org/D19814
llvm-svn: 269365
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Current clang trunk reports _OPENMP to be 201307 = OpenMP 4.0. It doesn't
recognize '#pragma omp declare target' though (patch still pending) and
therefore fails compilation.
Differential Revision: http://reviews.llvm.org/D16631
llvm-svn: 259026
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The patch adds support for ompt_event_task_switch into LLVM/OpenMP. Note that
the patch has also updated the signature of ompt_event_task_switch to
ompt_task_pair_callback_t (rather than the previous ompt_task_switch_callback_t).
Patch by Harald Servat
Differential Revision: http://reviews.llvm.org/D14566
llvm-svn: 252761
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The OMPT specification has changed. This revision brings the LLVM OpenMP
implementation up to date.
Technical overview of changes:
Previously, a public weak symbol ompt_initialize was called after the OpenMP
runtime is initialized. The new interface calls a global weak symbol ompt_tool
prior to initialization. If a tool is present, ompt_tool returns a pointer to
a function that matches the signature for ompt_initialize. After OpenMP is
initialized the function pointer is called to initialize a tool.
Knowing that OMPT will be enabled before initialization allows OMPT support to
be initialized as part of initialization instead of back patching
initialization of OMPT support after the fact.
Post OpenMP initialization support has been generalized moves from
ompt-specific.c into ompt-general.c, since the OMPT initialization logic is no
longer implementation specific.
Patch by John Mellor-Crummey
Differential Revision: http://reviews.llvm.org/D12998
llvm-svn: 248187
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This change deletes the Makefile+Perl build system and all files used by it
which aren't used by the CMake build system. This included many Perl files,
*.mk files, iomp* files. This change also updates the README's and
index.html to instruct the user to use the CMake build system. All mentioning
of the Perl+Makefile based system are removed.
Differential Revision: http://reviews.llvm.org/D12331
llvm-svn: 247583
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Currently, the libomp CMake build system uses a Perl script to configure files
(tools/expand-vars.pl). This patch replaces the use of the Perl script by using
CMake's configure_file() function. The major changes include:
1. *.var has every $KMP_* variable changed to @LIBOMP_*@
2. kmp_config.h.cmake is a new file which contains all the feature macros and
#cmakedefine lines
3. Most of the -D lines have been moved from LibompDefinitions.cmake but some
OS specific MACROs (e.g., _GNU_SOURCE) remain.
4. All expand-vars.pl related logic is removed from the CMake files.
One important note about this change is that it breaks the old Perl+Makefile
build system because it can't create kmp_config.h properly.
Differential Review: http://reviews.llvm.org/D12211
llvm-svn: 246314
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This patch makes it possible for a performance tool that uses call stack
unwinding to map implementation-level call stacks from master and worker
threads into a unified global view. There are several components to this patch.
include/*/ompt.h.var
Add a new enumeration type that indicates whether the code for a master task
for a parallel region is invoked by the user program or the runtime system
Change the signature for OMPT parallel begin/end callbacks to indicate whether
the master task will be invoked by the program or the runtime system. This
enables a performance tool using call stack unwinding to handle these two
cases differently. For this case, a profiler that uses call stack unwinding
needs to know that the call path prefix for the master task may differ from
those available within the begin/end callbacks if the program invokes the
master.
kmp.h
Change the signature for __kmp_join_call to take an additional parameter
indicating the fork_context type. This is needed to supply the OMPT parallel
end callback with information about whether the compiler or the runtime
invoked the master task for a parallel region.
kmp_csupport.c
Ensure that the OMPT task frame field reenter_runtime_frame is properly set
and cleared before and after calls to fork and join threads for a parallel
region.
Adjust the code for the new signature for __kmp_join_call.
Adjust the OMPT parallel begin callback invocations to carry the extra
parameter indicating whether the program or the runtime invokes the master
task for a parallel region.
kmp_gsupport.c
Apply all of the analogous changes described for kmp_csupport.c for the GOMP
interface
Add OMPT support for the GOMP combined parallel region + loop API to
maintain the OMPT task frame field reenter_runtime_frame.
kmp_runtime.c:
Use the new information passed by __kmp_join_call to adjust the OMPT
parallel end callback invocations to carry the extra parameter indicating
whether the program or the runtime invokes the master task for a parallel
region.
ompt_internal.h:
Use the flavor of the parallel region API (GNU or Intel) to determine who
invokes the master task.
Differential Revision: http://reviews.llvm.org/D11259
llvm-svn: 242817
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r242052 changed the name of OMPT placeholder functions to move them from
the omp_ name space to the ompt_ name space. This patch moves the names of the
types of these functions into the OMPT name space as well.
Patch by John Mellor-Crummey
Differential Revision: http://reviews.llvm.org/D11171
llvm-svn: 242155
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1.) in kmp_csupport.c, move computation of parameters only needed for OMPT tracing
inside a conditional to reduce overhead if not receiving ompt_event_master_begin
callbacks.
2.) in kmp_gsupport.c, remove spurious reset of OMPT reenter_runtime_frame (which
is set in its caller, GOMP_parallel_start correct placement of #if OMP_TRACE so
that state is maintained even if tracing support not included.
3.) in z_Linux_util.c, add architecture independent support for OMPT by setting
and resetting OMPT's exit_frame_ptr before and after invoking a microtask.
4.) On the Intel MIC, the loader refuses to retain static symbols in the
libomp.so shared library, even though tools need them. The loader could not be
bullied into doing so. To accommodate this, I changed the visibility of OMPT
placeholder functions to public. This required additions in exports.so.txt,
adding extern "C" scoping in ompt-general.c so that the public placeholder
symbols won't be mangled.
Patch by John Mellor-Crummey
Differential Revision: http://reviews.llvm.org/D11062
llvm-svn: 242052
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llvm-svn: 236619
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build infrastructure
llvm-svn: 236117
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all the source files.
llvm-svn: 227207
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understand that this is not friendly, and are working to change our
internal code-development to make it easier to make development
features available more frequently and in finer (more functional)
chunks. Unfortunately we haven't got that in place yet, and unpicking
this into multiple separate check-ins would be non-trivial, so please
bear with me on this one. We should be better in the future.
Apologies over, what do we have here?
GGC 4.9 compatibility
--------------------
* We have implemented the new entrypoints used by code compiled by GCC
4.9 to implement the same functionality in gcc 4.8. Therefore code
compiled with gcc 4.9 that used to work will continue to do so.
However, there are some other new entrypoints (associated with task
cancellation) which are not implemented. Therefore user code compiled
by gcc 4.9 that uses these new features will not link against the LLVM
runtime. (It remains unclear how to handle those entrypoints, since
the GCC interface has potentially unpleasant performance implications
for join barriers even when cancellation is not used)
--- new parallel entry points ---
new entry points that aren't OpenMP 4.0 related
These are implemented fully :-
GOMP_parallel_loop_dynamic()
GOMP_parallel_loop_guided()
GOMP_parallel_loop_runtime()
GOMP_parallel_loop_static()
GOMP_parallel_sections()
GOMP_parallel()
--- cancellation entry points ---
Currently, these only give a runtime error if OMP_CANCELLATION is true
because our plain barriers don't check for cancellation while waiting
GOMP_barrier_cancel()
GOMP_cancel()
GOMP_cancellation_point()
GOMP_loop_end_cancel()
GOMP_sections_end_cancel()
--- taskgroup entry points ---
These are implemented fully.
GOMP_taskgroup_start()
GOMP_taskgroup_end()
--- target entry points ---
These are empty (as they are in libgomp)
GOMP_target()
GOMP_target_data()
GOMP_target_end_data()
GOMP_target_update()
GOMP_teams()
Improvements in Barriers and Fork/Join
--------------------------------------
* Barrier and fork/join code is now in its own file (which makes it
easier to understand and modify).
* Wait/release code is now templated and in its own file; suspend/resume code is also templated
* There's a new, hierarchical, barrier, which exploits the
cache-hierarchy of the Intel(r) Xeon Phi(tm) coprocessor to improve
fork/join and barrier performance.
***BEWARE*** the new source files have *not* been added to the legacy
Cmake build system. If you want to use that fixes wil be required.
Statistics Collection Code
--------------------------
* New code has been added to collect application statistics (if this
is enabled at library compile time; by default it is not). The
statistics code itself is generally useful, the lightweight timing
code uses the X86 rdtsc instruction, so will require changes for other
architectures.
The intent of this code is not for users to tune their codes but
rather
1) For timing code-paths inside the runtime
2) For gathering general properties of OpenMP codes to focus attention
on which OpenMP features are most used.
Nested Hot Teams
----------------
* The runtime now maintains more state to reduce the overhead of
creating and destroying inner parallel teams. This improves the
performance of code that repeatedly uses nested parallelism with the
same resource allocation. Set the new KMP_HOT_TEAMS_MAX_LEVEL
envirable to a depth to enable this (and, of course, OMP_NESTED=true
to enable nested parallelism at all).
Improved Intel(r) VTune(Tm) Amplifier support
---------------------------------------------
* The runtime provides additional information to Vtune via the
itt_notify interface to allow it to display better OpenMP specific
analyses of load-imbalance.
Support for OpenMP Composite Statements
---------------------------------------
* Implement new entrypoints required by some of the OpenMP 4.1
composite statements.
Improved ifdefs
---------------
* More separation of concepts ("Does this platform do X?") from
platforms ("Are we compiling for platform Y?"), which should simplify
future porting.
ScaleMP* contribution
---------------------
Stack padding to improve the performance in their environment where
cross-node coherency is managed at the page level.
Redesign of wait and release code
---------------------------------
The code is simplified and performance improved.
Bug Fixes
---------
*Fixes for Windows multiple processor groups.
*Fix Fortran module build on Linux: offload attribute added.
*Fix entry names for distribute-parallel-loop construct to be consistent with the compiler codegen.
*Fix an inconsistent error message for KMP_PLACE_THREADS environment variable.
llvm-svn: 219214
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llvm-svn: 191506
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