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* [OpenMP] Clean up load balancing dynamic modeJonathan Peyton2019-04-081-1/+1
| | | | | | | | | | | | | | | | This patch cleans up the bookkeeping code for the load balancing dynamic mode. When a thread is moved to or from the thread pool, the th_active_in_pool flag and the __kmp_thread_pool_active_nth global counter are both updated. This removes the need for the corrective code in the main wait loop. Another global counter, __kmp_thread_pool_nth, was removed completely, as it was only used for debugging, but was not under KMP_DEBUG. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D59508 llvm-svn: 357927
* [OpenMP] Make use of sched_yield optional in runtimeJonathan Peyton2019-02-281-40/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch cleans up the yielding code and makes it optional. An environment variable, KMP_USE_YIELD, was added. Yielding is still on by default (KMP_USE_YIELD=1), but can be turned off completely (KMP_USE_YIELD=0), or turned on only when oversubscription is detected (KMP_USE_YIELD=2). Note that oversubscription cannot always be detected by the runtime (for example, when the runtime is initialized and the process forks, oversubscription cannot be detected currently over multiple instances of the runtime). Because yielding can be controlled by user now, the library mode settings (from KMP_LIBRARY) for throughput and turnaround have been adjusted by altering blocktime, unless that was also explicitly set. In the original code, there were a number of places where a double yield might have been done under oversubscription. This version checks oversubscription and if that's not going to yield, then it does the spin check. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D58148 llvm-svn: 355120
* Update more file headers across all of the LLVM projects in the monorepoChandler Carruth2019-01-191-4/+3
| | | | | | | | | | | | | | | | | | 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
* [OpenMP] Add omp_pause_resource* APIJonathan Peyton2019-01-161-1/+24
| | | | | | | | | | | | Add omp_pause_resource and omp_pause_resource_all API and enum, plus stub for internal implementation. Implemented callable helper function to do local pause, and added basic functionality for hard and soft pause. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D55078 llvm-svn: 351372
* [OpenMP] Fix transient divide by zero bug in 32-bit codeJonathan Peyton2018-12-131-4/+11
| | | | | | | | | | | | | | | | The value returned by __kmp_now_nsec() can overflow 32-bit values causing incorrect values to be returned. The overflow can end up causing a divide by zero error because in __kmp_initialize_system_tick(), the value (__kmp_now_nsec() - nsec) can end up being much larger than the numerator: 1e6 * (delay + (now - goal)) during a pathological timing where the current time calculated is much larger than nsec. When this happens, the value of __kmp_ticks_per_msec is set to zero which is then used as the denominator in the KMP_NOW_MSEC() macro leading to the divide by zero error. Differential Revision: https://reviews.llvm.org/D55300 llvm-svn: 349090
* [runtime] Use getloadavg() on NetBSD as wellMichal Gorny2018-12-111-1/+1
| | | | | | | | | | Switch NetBSD from reading /proc (which is broken) to getloadavg() (which is already used by Darwin). NetBSD discourages using procfs in favor of system API calls. Differential Revision: https://reviews.llvm.org/D55486 llvm-svn: 348885
* Implement __kmp_is_address_mapped() for NetBSDKamil Rytarowski2018-12-111-2/+35
| | | | | | | | | | | | | | | | | | Summary: Use the sysctl(3) function to check whether an address is mapped into the address space. Reviewers: mgorny, joerg, #openmp Reviewed By: mgorny Subscribers: openmp-commits Tags: #openmp Differential Revision: https://reviews.llvm.org/D55549 llvm-svn: 348874
* Add OpenBSD support to OpenMPKamil Rytarowski2018-12-091-6/+7
| | | | | | | | | | | | | | | | Summary: This patch permits OpenMP to build and work (with both gcc and clang) on OpenBSD. It mostly follows what was done for FreeBSD and NetBSD, except OpenBSD does not have pthread_getattr_np support, so it follows OS X in that one instance. Reviewers: #openmp, krytarowski Reviewed By: krytarowski Subscribers: guansong, jfb, emaste, mgorny, krytarowski, #openmp Tags: #openmp Differential Revision: https://reviews.llvm.org/D34280 llvm-svn: 348726
* Add DragonFlyBSD support to OpenMPKamil Rytarowski2018-12-091-10/+14
| | | | | | | | | | | | | | | | | | | | | | | | Summary: Additions mostly follow FreeBSD and NetBSD and are not intrusive. There is similar patch for OpenBSD: https://reviews.llvm.org/D34280 The -lm was being omitted due to -Wl,--as-needed in cmake rule, similar patch is in freebsd-ports/devel/llvm-devel port. Simple OpenMP programs compile and work as expected: $ clang-devel ~/omp_hello.c -fopenmp -I/usr/local/llvm-devel/include $ LD_LIBRARY_PATH=/usr/local/llvm-devel/lib OMP_NUM_THREADS=100 ./a.out The assertion in LLVMgold.so when -fopenmp was used together with -flto in 20170524 snapshot is no longer triggered on current svn-trunk and works fine as in llvm-4.0 with our local patches. Reviewers: #openmp, krytarowski Reviewed By: krytarowski Subscribers: dexonsmith, jfb, krytarowski, guansong, gregrodgers, emaste, mgorny, mehdi_amini Differential Revision: https://reviews.llvm.org/D35129 llvm-svn: 348725
* Add Hurd support.Andrey Churbanov2018-11-071-6/+5
| | | | | | | | Patch by samuel.thibault@ens-lyon.org Differential Revision: https://reviews.llvm.org/D54079 llvm-svn: 346310
* [OpenMP][Stats] Cleanup stats gathering codeJonathan Peyton2018-07-301-1/+1
| | | | | | | | | | | | | | | | | | | | | | 1) Remove unnecessary data from list node structure 2) Remove timerPair in favor of pushing/popping explicitTimers. This way, nested timers will work properly. 3) Fix #pragma omp critical timers 4) Add histogram capability 5) Add KMP_STATS_FILE formatting capability 6) Have time partitioned into serial & parallel by introducing partitionedTimers::exchange(). This also counts the number of serial regions in the executable. 7) Fix up the timers around OMP loops so that scheduling overhead and work are both counted correctly. 8) Fix up the iterations statistics so they count the number of iterations the thread receives at each loop scheduling event 9) Change timers so there is only one RDTSC read per event change 10) Fix up the outdated comments for the timers Differential Revision: https://reviews.llvm.org/D49699 llvm-svn: 338276
* [OpenMP] Use C++11 Atomics - barrier, tasking, and lock codeJonathan Peyton2018-07-091-5/+5
| | | | | | | | | | | | | | | | | These are preliminary changes that attempt to use C++11 Atomics in the runtime. We are expecting better portability with this change across architectures/OSes. Here is the summary of the changes. Most variables that need synchronization operation were converted to generic atomic variables (std::atomic<T>). Variables that are updated with combined CAS are packed into a single atomic variable, and partial read/write is done through unpacking/packing Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D47903 llvm-svn: 336563
* Minor cleanup in __kmp_atfork_child()Jonathan Peyton2018-03-301-1/+0
| | | | | | | | | | | | This change removes the unnecessary lock operation on __kmp_initz_lock inside the __kmp_atfork_child() function for Linux; the lock variable is initialized in the same function later. Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D44949 llvm-svn: 328900
* Fixed libomp static build broken by the commit rL322202.Andrey Churbanov2018-01-111-0/+2
| | | | | | | | Patch by simone <simone@cs.utah.edu>. Differential Revision: https://reviews.llvm.org/D41945 llvm-svn: 322282
* Improve stability of the runtime in parent/child processesJonathan Peyton2018-01-101-2/+15
| | | | | | | | | | | | | | | This change improves stability of the runtime when the application forks child processes. Acquiring/releasing __kmp_initz_lock and __kmp_forkjoin_lock in the atfork handlers insures that the actual fork does not occur while those two locks are held, and __kmp_itt_reset() reverts the itt's global state to the initial state which also initializes the mutex stored in the global state. Some missing initialization code was also inserted in the child's atfork handler. Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D41462 llvm-svn: 322202
* Cleanup version symbol macros and attributes/declspecsJonathan Peyton2017-11-071-2/+2
| | | | | | | | | | | | 1) Get rid of xaliasify, xexpand and xversionify for KMP_EXPAND_NAME and KMP_VERSION_SYMBOL. KMP_VERSION_SYMBOL is a combination of xaliasify and xversionify. 2) Put all attribute and __declspec definitions in kmp_os.h Differential Revision: https://reviews.llvm.org/D39516 llvm-svn: 317636
* Update implementation of OMPT to the specification OpenMP 5.0 Preview 1 (TR4).Joachim Protze2017-11-011-1/+1
| | | | | | | | | | | | | | The code is tested to work with latest clang, GNU and Intel compiler. The implementation is optimized for low overhead when no tool is attached shifting the cost to execution with tool attached. This patch does not implement OMPT for libomptarget. Patch by Simon Convent and Joachim Protze Differential Revision: https://reviews.llvm.org/D38185 llvm-svn: 317085
* Apply formatting changesJonathan Peyton2017-10-201-3/+0
| | | | | | | | | | .clang-format's comments are removed and a (hopefully) final set of formatting changes are applied. Differential Revision: https://reviews.llvm.org/D38837 Differential Revision: https://reviews.llvm.org/D38920 llvm-svn: 316227
* Remove unnecessary semicolonsJonathan Peyton2017-09-271-66/+65
| | | | | | | | Removes semicolons after if {} blocks, function definitions, etc. I was able to apply the large OMPT patch cleanly on top of this one with no conflicts. llvm-svn: 314340
* Minor code cleanup of Klocwork issuesJonathan Peyton2017-09-051-33/+24
| | | | | | | | | | | Minor code cleanup of Klocwork issues. Fatal messages are given no return attribute. Define and use KMP_NORETURN to work for multiple C++ versions. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D37275 llvm-svn: 312538
* Remove BUILD_TVJonathan Peyton2017-08-171-35/+0
| | | | | | | | | | Cleanup code to remove BUILD_TV and unused code bracketed by it. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D36011 llvm-svn: 311114
* OpenMP RTL cleanup: eliminated warnings with -Wcast-qual, patch 2.Andrey Churbanov2017-07-171-11/+10
| | | | | | | | | Changes are: got all atomics to accept volatile pointers that allowed to simplify many type conversions. Windows specific code fixed correspondingly. Differential Revision: https://reviews.llvm.org/D35417 llvm-svn: 308164
* OpenMP RTL cleanup: eliminated warnings with -Wcast-qual.Andrey Churbanov2017-07-031-6/+8
| | | | | | | | | | | Changes are: replaced C-style casts with cons_cast and reinterpret_cast; type of several counters changed to signed; type of parameters of 32-bit and 64-bit AND and OR intrinsics changes to unsigned; changed files formatted using clang-format version 3.8.1. Differential Revision: https://reviews.llvm.org/D34759 llvm-svn: 307020
* Set affinity to none/false in child processesJonathan Peyton2017-06-151-1/+12
| | | | | | | | | | | | Reset affinity to none (false for proc-bind-var) so that threads in the child processes are not bound tightly, unless the user explicitly sets this in KMP_AFFINITY/OMP_PROC_BIND, in child processes. This can improve performance for scripting languages which fork for parallelism like Python's multiprocessing module. Differential Revision: https://reviews.llvm.org/D34154 llvm-svn: 305513
* Reset initial affinity in children processesJonathan Peyton2017-06-131-0/+6
| | | | | | | | | | | | | | | | If OpenMP is initialized before fork()-ing occurs and affinity is set to something like compact, then the master thread will be pinned to a single HW thread/core after initialization. If the master (or any other thread) then forks N processes, all N processes will then be pinned to that same single HW thread/core. To reset the affinity for the new child process, the atfork handler for the child process can call kmp_set_thread_affinity_mask_initial() to reset its affinity to the initial affinity of the application before it re-initializes libomp. The parent process will not be affected and still keeps its affinity setting. Differential Revision: https://reviews.llvm.org/D34118 llvm-svn: 305306
* Clang-format and whitespace cleanup of source codeJonathan Peyton2017-05-121-1990/+1769
| | | | | | | | | | | | | This patch contains the clang-format and cleanup of the entire code base. Some of clang-formats changes made the code look worse in places. A best effort was made to resolve the bulk of these problems, but many remain. Most of the problems were mangling line-breaks and tabbing of comments. Patch by Terry Wilmarth Differential Revision: https://reviews.llvm.org/D32659 llvm-svn: 302929
* Fix crash in invoking microtask on ios arm64.Andrey Churbanov2017-04-171-1/+1
| | | | | | | | Patch by Ni Hui. Differential Revision: https://reviews.llvm.org/D31923 llvm-svn: 300448
* Minor improvement of KMP_YIELD_NOW() macro.Jonathan Peyton2017-03-201-3/+3
| | | | | | | | | | | This change slightly improves performance of KMP_YIELD_NOW() macro, by using _rdtsc() intrinsic function if possible. Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D31008 llvm-svn: 298314
* Removing couple unnecessary architecture guards.Jonathan Peyton2017-02-281-2/+2
| | | | | | | | | This section of code (__kmp_test_then_* functions) is guarded by (KMP_ARCH_X86 || KMP_ARCH_X86_64) so it does not make sense to have other architecture guards inside this section. Non-x86 architectures always use intrinsics (__sync_*) llvm-svn: 296525
* Enable yield cycle on LinuxJonathan Peyton2017-02-151-5/+8
| | | | | | | | | | | | This change allows the runtime to turn __kmp_yield() on/off repeatedly on Linux. This feature was removed when disabling monitor thread, but there are applications that perform better with this feature on. Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D29227 llvm-svn: 295203
* Follow up to r289732: Update comments in source files to reference .cpp filesJonathan Peyton2016-12-141-2/+2
| | | | | | Patch by Hansang Bae llvm-svn: 289739
* Change source files from .c to .cppJonathan Peyton2016-12-141-0/+2612
Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D26688 llvm-svn: 289732
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