These are needed by both libraries, so we can do that in a
common namespace and unify configuration parameters.
Also make sure that the user isn't requesting libomptarget
if the library cannot be built on the system. Issue an error
in that case.
Differential Revision: https://reviews.llvm.org/D40081
llvm-svn: 319342
Traditionally, the library had a weak symbol for ompt_start_tool()
that served as fallback and disabled OMPT if called. Tools could
provide their own version and replace the default implementation
to register callbacks and lookup functions. This mechanism has
worked reasonably well on Linux systems where this interface was
initially developed.
On Darwin / Mac OS X the situation is a bit more complicated and
the weak symbol doesn't work out-of-the-box. In my tests, the
library with the tool needed to link against the OpenMP runtime
to make the process work. This would effectively mean that a tool
needed to choose a runtime library whereas one design goal of the
interface was to allow tools that are agnostic of the runtime.
The solution is to use dlsym() with the argument RTLD_DEFAULT so
that static implementations of ompt_start_tool() are found in the
main executable. This works because the linker on Mac OS X includes
all symbols of an executable in the global symbol table by default.
To use the same code path on Linux, the application would need to
be built with -Wl,--export-dynamic. To avoid this restriction, we
continue to use weak symbols on Linux systems as before.
Finally this patch extends the existing test to cover all possible
ways of initializing the tool as described by the standard. It
also fixes ompt_finalize() to not call omp_get_thread_num() when
the library is shut down which resulted in hangs on Darwin.
The changes have been tested on Linux to make sure that it passes
the current tests as well as the newly extended one.
Differential Revision: https://reviews.llvm.org/D39801
llvm-svn: 317980
This set of changes enables the affinity interface (Either the preexisting
native operating system or HWLOC) to be dynamically set at runtime
initialization. The point of this change is that we were seeing performance
degradations when using HWLOC. This allows the user to use the old affinity
mechanisms which on large machines (>64 cores) makes a large difference in
initialization time.
These changes mostly move affinity code under a small class hierarchy:
KMPAffinity
class Mask {}
KMPNativeAffinity : public KMPAffinity
class Mask : public KMPAffinity::Mask
KMPHwlocAffinity
class Mask : public KMPAffinity::Mask
Since all interface functions (for both affinity and the mask implementation)
are virtual, the implementation can be chosen at runtime initialization.
Differential Revision: https://reviews.llvm.org/D26356
llvm-svn: 286890
This patch allows ThreadSanitizer (Tsan) to verify OpenMP programs.
It means that no false positive will be reported by Tsan when
verifying an OpenMP programs.
This patch introduces annotations within the OpenMP runtime module to
provide information about thread synchronization to the Tsan runtime.
In order to enable the Tsan support when building the runtime, you must
enable the TSAN_SUPPORT option with the following environment variable:
-DLIBOMP_TSAN_SUPPORT=TRUE
The annotations will be enabled in the main shared library
(same mechanism of OMPT).
Patch by Simone Atzeni and Joachim Protze!
Differential Revision: https://reviews.llvm.org/D13072
llvm-svn: 286115
This patch allows a user to enable Hwloc on windows. There are three main
changes in here:
1.kmp.h - Move definitions/declarations out of KMP_OS_WINDOWS guard (our windows
implementation of affinity) because they need to be defined when
KMP_USE_HWLOC is on as well.
2.teach __kmp_set_system_affinity, __kmp_get_system_affinity,
__kmp_get_proc_group, and __kmp_affinity_bind_thread how to use hwloc.
3.teach CMake how to include hwloc when building Windows
Another minor change in here is to make sure that anything under KMP_USE_HWLOC
is also guarded by KMP_AFFINITY_SUPPORTED as well. This is to prevent Mac
builds from requiring anything from Hwloc.
Differential Revision: http://reviews.llvm.org/D21441
llvm-svn: 272951
This change fixes the bug: https://llvm.org/bugs/show_bug.cgi?id=25975
by bypassing the perl module files which try to deduce system information.
These perl modules files don't offer useful information and are from the
original build system. They can be removed after this change.
llvm-svn: 258843
This change allows clang to build the stats library for every architecture
which supports __builtin_readcyclecounter(). CMake also checks for all
necessary features for stats and will error out if the platform does not
support it.
Patch by Hal Finkel and Johnny Peyton
llvm-svn: 256002
These changes allow libhwloc to be used as the topology discovery/affinity
mechanism for libomp. It is supported on Unices. The code additions:
* Canonicalize KMP_CPU_* interface macros so bitmask operations are
implementation independent and work with both hwloc bitmaps and libomp
bitmaps. So there are new KMP_CPU_ALLOC_* and KMP_CPU_ITERATE() macros and
the like. These are all in kmp.h and appropriately placed.
* Hwloc topology discovery code in kmp_affinity.cpp. This uses the hwloc
interface to create a libomp address2os object which the rest of libomp knows
how to handle already.
* To build, use -DLIBOMP_USE_HWLOC=on and
-DLIBOMP_HWLOC_INSTALL_DIR=/path/to/install/dir [default /usr/local]. If CMake
can't find the library or hwloc.h, then it will tell you and exit.
Differential Revision: http://reviews.llvm.org/D13991
llvm-svn: 254320
The problem is that the ompt_tool() function (which must be implemented by a
performance tool) should be defined in the RTL as well to cover the case when
the tool is not present in the address space of the process. This functionality
is accomplished with weak symbols in Unices. Unfortunately, Windows does not
support weak symbols.
The solution in these changes is to grab the list of all modules loaded by the
process and then search for symbol "ompt_tool()" within them. The function
ompt_tool_windows() performs the search of the ompt_tool symbol. If ompt_tool is
found, then its return value is used to initialize the tool. If ompt_tool is not
found, then ompt_tool_windows() returns NULL and OMPT is thus, disabled.
While doing these changes, the OMPT_SUPPORT detection in CMake was changed to
test for the required featuers for OMPT_SUPPORT, namely: builtin_frame_address()
existence, weak attribute existence and psapi.dll existence. For
LIBOMP_HAVE_OMPT_SUPPORT to be true, it must be that the builtin_frame_address()
intrinsic exists AND one of: either weak attributes exist or psapi.dll exists.
Also, since Process Status API is used I had to add new dependency -- psapi.dll
to the library dependency micro test.
Differential Revision: http://reviews.llvm.org/D14027
llvm-svn: 251654
clean up the build.
This disables all of the Clang warnings that fire for me when building
libomp.so on Linux with a recent Clang binary. Lots of these should
probably be fixed, but I want to at least get the build warning-clean
and make it easy to keep that way.
I also switched a bunch of the warnings that are used both for C and C++
compiles to check the flag with C compilation test.
Differential Revision: http://reviews.llvm.org/D11253
llvm-svn: 242604
I apologize for this nasty commit, but I somehow overlooked Chandler's
comment to re-indent these files to two space indention. I know this
is a horrible commit, but I figured if it was done quickly after the
first one, not too many conflicts would arise.
Again, I'm sorry and won't do this again.
llvm-svn: 242301
This commit improves numerous functionalities of the OpenMP CMake build
system to be more conducive with LLVM's build system and build philosophies.
The CMake build system, as it was before this commit, was not up to LLVM's
standards and did not implement the configuration stage like most CMake based
build systems offer (check for compiler flags, libraries, etc.) In order to
improve it dramatically in a short period of time, a large refactoring had
to be done.
The main changes done with this commit are as follows:
* Compiler flag checks - The flags are no longer grabbed from compiler specific
directories. They are checked for availability in config-ix.cmake and added
accordingly inside LibompHandleFlags.cmake.
* Feature checks were added in config-ix.cmake. For example, the standard CMake
module FindThreads is probed for the threading model to use inside the OpenMP
library.
* OS detection - There is no longer a LIBOMP_OS variable, OS-specifc build logic
is wrapped around the WIN32 and APPLE macros with !(WIN32 OR APPLE) meaning
a Unix flavor of some sort.
* Got rid of vestigial functions/macros/variables
* Added new libomp_append() function which is used everywhere to conditionally
or undconditionally append to a list
* All targets have the libomp prefix so as not to interfere with any other
project
* LibompCheckLinkerFlag.cmake module was added which checks for linker flags
specifically for building shared libraries.
* LibompCheckFortranFlag.cmake module was added which checks for fortran flag
availability.
* Removed most of the cruft from the translation between the perl+Makefile based
build system and this one. The remaining components that they share are
perl scripts which I'm in the process of removing.
There is still more left to do. The perl scripts still need to be removed, and
a config.h.in file (or similarly named) needs to be added with #cmakedefine lines
in it. But this is a much better first step than the previous system.
Differential Revision: http://reviews.llvm.org/D10656
llvm-svn: 242298
Jonas Hahnfeld