Fix MPI Signal Handling on Perlmutter #3029

ax3l · 2022-04-06T20:36:09Z

Follow-up to #2896. Not part of release 22.04.
First seen by @RTSandberg and @Yin-YinjianZhao.

Thx to @kngott and Brandon for rapid NERSC consulting support.

Fix: `MPI_C(XX)_BOOL`

C99 types were aded in MPI-2.2, while Cray's MPICH fork in version 8.1.13 defines MPI_CXX_BOOL to MPI_DATATYPE_NULL on Perlmutter.

We could use MPI_C_BOOL, which is technically a _Bool from (deprecated: C++17; removed: C++20) - or we simply do a static assert on sizeof(bool) and communicate as a MPI_BYTE or MPI_CHAR.

Do not Broadcast if no action is registered

Do no MPI Comms if no action is configured.

C99 types were aded in MPI-2.2, while Cray's MPICH fork in version 8.1.13 defines `MPI_CXX_BOOL` to `MPI_DATATYPE_NULL` on Perlmutter. We could use `MPI_C_BOOL`, which is technically a `_Bool` from [<cstdbool>](https://en.cppreference.com/w/cpp/header/cstdbool) (deprecated: C++17; removed: C++20) - or we simply do a static assert on `sizeof(bool)` and communicate as a `MPI_BYTE` or `MPI_CHAR`.

PhilMiller · 2022-04-06T22:17:39Z

Source/ablastr/utils/SignalHandling.cpp

@@ -140,6 +152,10 @@ SignalHandling::InitSignalHandling()
 void
 SignalHandling::CheckSignals()
 {
+    // Do not perform MPI communication if no signal action is configured


The comment here threw me off - I was going to remark that this check should come after the testing of signal flags, lest signal handling be disabled in the single-process case. I had to think to realize that this is itself a check whether any signal handling is enabled. Please reword the comment

Thx, rephrased :)

PhilMiller · 2022-04-06T22:24:57Z

Source/ablastr/utils/SignalHandling.cpp

@@ -162,14 +178,19 @@ SignalHandling::CheckSignals()

 #if defined(AMREX_USE_MPI)
    auto comm = amrex::ParallelDescriptor::Communicator();
+    static_assert(sizeof(bool) == 1, "We communicate bools as 1 byte-sized type in MPI");


Please comment that this is an accommodation for Cray's deficient MPI implementation. They support the MPI 3 asynchronous collective, but not the simple datatype definition.

Yeah, it's a pitty!
Will add the same description as in the PR to make clear why we hack back to bytes

PhilMiller · 2022-04-06T22:26:17Z

Source/ablastr/utils/SignalHandling.cpp

+bool
+SignalHandling::anySignalConfActive ()
+{
+    bool any_signal_active = false;


Should this maybe be a member variable of SignalHandling, that can be set just once, rather than looping over everything twice every step?

that probably makes sense, yes.
I was coding this in a way that one could register signals later on, e.g., from the Python layer. But not sure if that's truly needed.

We set that variable at the end of the config step, so even if someone configures it later, it would be set consistently.

PhilMiller · 2022-04-06T22:27:43Z

Code and updated documentation look fine to me.

ax3l · 2022-04-07T00:37:30Z

@PhilMiller thank you for the review, updated accordingly :)

PhilMiller · 2022-04-07T02:14:37Z

Source/ablastr/utils/SignalHandling.cpp

+
+    for (int signal_number = 0; signal_number < NUM_SIGNALS; ++signal_number) {
+        for (int signal_request = 0; signal_request < SIGNAL_REQUESTS_SIZE; ++signal_request) {
+            m_any_signal_action_active |= signal_conf_requests[signal_request][signal_number];


You can just set this to true at line 128

Hm, cannot follow, do you mean line 138?
Even then I am not sure - if init handling is called but no conf request was passed, then I still want this to be false, no?

I was suggesting inside the if (signal_active) { block - i.e. exactly where we're already checking the array entries

ah, of course. good idea :)

PhilMiller

Up to you whether to do the last suggested simplification.

* Moving Frame Field Probe Functionality (ECP-WarpX#2996) * DRAFT for Moving Frame * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Adds m_last_compute_step * Generalized SetParticlePosition, semicolons and formatting * Update Source/Diagnostics/ReducedDiags/FieldProbe.H Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Moved particle push before calculations. Condensed stuff. * Fixed Velocity, added start and stop time functionality * Documentation * Apply suggestions from code review Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Empty-Commit * Fixed ParallelFor from review * FP moving window in laser_acceleration 1d, 2d, 3d test * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Line detector instead of point Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Refactoring: More General Interfaces (ECP-WarpX#2991) * Refactoring: More General Interfaces (J, rho) * Refactoring: More General Interfaces (E, B) * Refactoring: More General Interfaces (rho) * Fix const Correctness * Fix const Correctness (continued) * Fix Bugs * Refactoring: More General Interfaces (averaged E, averaged B) * LoadBalanceCosts: num_cells & num_macro_particles (ECP-WarpX#3019) * Examples: LBC in Laser-Ion Example * LoadBalanceCosts: num_cells & num_macro_particles * Fix Script: Wrong Header Counting Spliced out the first to columns twice. * Fix Script: Blocking Factor The script did not work if a direction only had one block * Fix Script: 2D/3D There is no generic way from the data we write to find this out, without breaking corner cases such as one-block in one direction. * LoadBalanceCosts: Fix Unused Vars in Script Leftover to ECP-WarpX#3019 * Semicoarsening in electrostatic solvers (ECP-WarpX#3024) * Semicoarsening in electrostatic solvers Enable semicoarsening in electrostatic solvers if the problem is anisotropic due to relativistic beam and/or anisotropic cell spacing. * Update relativistic_space_charge_initialization benchmark * AMReX: Update to latest commit (ECP-WarpX#3021) * Added PlasmaLens class to PICMI (ECP-WarpX#3025) * Added PlasmaLens class to PICMI * Added CI test * Added PICMI input file * Fixed the output dir for the CI test * Add `_plt` to Output File Prefix Co-authored-by: Edoardo Zoni <59625522+EZoni@users.noreply.github.com> * Minor fixes removing warnings from MSVC C++ (ECP-WarpX#3022) * Fix MPI Signal Handling on Perlmutter (ECP-WarpX#3029) * Fix: `MPI_CXX_BOOL` -> `MPI_BYTE` C99 types were aded in MPI-2.2, while Cray's MPICH fork in version 8.1.13 defines `MPI_CXX_BOOL` to `MPI_DATATYPE_NULL` on Perlmutter. We could use `MPI_C_BOOL`, which is technically a `_Bool` from [<cstdbool>](https://en.cppreference.com/w/cpp/header/cstdbool) (deprecated: C++17; removed: C++20) - or we simply do a static assert on `sizeof(bool)` and communicate as a `MPI_BYTE` or `MPI_CHAR`. * Signals: Do no MPI Comms if none is configured * Docs: Link and Explain Allowed Signal Values * Review Comments & Style * Extend `do_pml_Lo/Hi` to MR Levels (ECP-WarpX#2890) * Vay Deposition: Fix SyncCurrent, FFTs (ECP-WarpX#3012) * Implemented the BCK fallback for the ECT solver (ECP-WarpX#3016) * Implemented the BCK fallback for the ECT solver * Ignored an unused variable * Bug fix * Fix issue with preprocessor directive * Added comments * Implemented suggestions from code review * Fixed tilebox * Improved warning * Using WarpX::RecordWarning instead of amrex::Print() * Ignoring RZ * Improving comment * Bug Fix * Lowered warning priority * Ignoring low priority warnings in ECT tests Co-authored-by: lgiacome <lorenzo.giacome@cern.ch> * No longer use a while loop in driving the simulation (#167) * add persistent flag for whether a terminate signal was received that can be read by python * handle checkpointing through sim_control * change terminateFlag from type int to bool * fix unintended changes to changelog * specify terminateFlag return type * code cleanup * revert upstream changes * remove use of while loop to run simulation * changes requested during PR review Co-authored-by: Tiberius Rheaume <35204125+TiberiusRheaume@users.noreply.github.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> Co-authored-by: Edoardo Zoni <59625522+EZoni@users.noreply.github.com> Co-authored-by: Weiqun Zhang <WeiqunZhang@lbl.gov> Co-authored-by: David Grote <grote1@llnl.gov> Co-authored-by: Lorenzo Giacomel <47607756+lgiacome@users.noreply.github.com> Co-authored-by: lgiacome <lorenzo.giacome@cern.ch>

@dpgrote

* CI: Fix Small Issue w/ Langmuir Plots (ECP-WarpX#3010) * Release 22.04 (ECP-WarpX#3018) * AMReX: 22.04 * PICSAR: 22.04 * WarpX: 22.04 * Switch test to use common build with openPMD enabled (ECP-WarpX#2988) * Switch test to use common build with OpenPMD enabled * Match GNU make to CMake change Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Allow process signals to trigger checkpoint or break behavior (ECP-WarpX#2896) * Beginnings of signal handling machinery * Add tentative logic to make checkpoint call * Adapt formatting slightly * Add calls to read signals and set up signal handlers * Initialize signal flag array * Add parsing of signal names, and fix some whitespace issues * Skip signal setup on Windows * added checkpoint and break signal inputs to picmi.py * Address initial review requests * Correct comment to match changed code * Convert maximum signal number to a symbolic name * Always parse signal input, and error out on Windows or wherever it may be unsupported * Typo fix * Add missing reset of checkpoint signal flag * Add reset of break signal, in support of Python or library usage * Test for a configured checkpoint diag when asked to checkpoint on a signal * Fix typo in Linux code path * Clean up MPI support * Use symbolic name for maximum signal number * Fix unused variable in the no-MPI case * Add missing header inclusions * Switch signal parsing to an enumerated table * Test signal handling for Linux, not GNU C library * Avoid another magic number * Update MPI_Ibcast call to match symbolic array length * Update loop over signal flags to use symbolic limit * Match #includes to usage * Add omitted C++ std <atomic> header include * Guard entire set of signal definitions as *nix-only, not for Windows * Broaden Windows exclusion to avoid zero-length array that displeases MSVC++ * Check return value from sigaction() * Convert conditional calls to Abort() to assertions * Move check for platform support to input parsing * Shift signal handling code over toward ABLASTR to share with ImpactX and Hipace++ * Minor cleanup * A bit more cleanup * Fix formatting nits * Add AMReX error handling on MPI calls * Add ABLASTR signal handling code to GNU makefile too * Document new input parameters * Use ABLASTR assertion macros in ABLASTR code * Convert requests limit value to a requests array size * Generalize signal handling to an arbitrary set of potential actions * Rename class to match usage and file name * Stick stuff in ABLASTR namespace * Indent conditional includes as requested Co-authored-by: Roelof <roelof.groenewald@modernelectron.com> * Moving Frame Field Probe Functionality (ECP-WarpX#2996) * DRAFT for Moving Frame * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Adds m_last_compute_step * Generalized SetParticlePosition, semicolons and formatting * Update Source/Diagnostics/ReducedDiags/FieldProbe.H Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Moved particle push before calculations. Condensed stuff. * Fixed Velocity, added start and stop time functionality * Documentation * Apply suggestions from code review Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Empty-Commit * Fixed ParallelFor from review * FP moving window in laser_acceleration 1d, 2d, 3d test * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Line detector instead of point Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Refactoring: More General Interfaces (ECP-WarpX#2991) * Refactoring: More General Interfaces (J, rho) * Refactoring: More General Interfaces (E, B) * Refactoring: More General Interfaces (rho) * Fix const Correctness * Fix const Correctness (continued) * Fix Bugs * Refactoring: More General Interfaces (averaged E, averaged B) * LoadBalanceCosts: num_cells & num_macro_particles (ECP-WarpX#3019) * Examples: LBC in Laser-Ion Example * LoadBalanceCosts: num_cells & num_macro_particles * Fix Script: Wrong Header Counting Spliced out the first to columns twice. * Fix Script: Blocking Factor The script did not work if a direction only had one block * Fix Script: 2D/3D There is no generic way from the data we write to find this out, without breaking corner cases such as one-block in one direction. * LoadBalanceCosts: Fix Unused Vars in Script Leftover to ECP-WarpX#3019 * Semicoarsening in electrostatic solvers (ECP-WarpX#3024) * Semicoarsening in electrostatic solvers Enable semicoarsening in electrostatic solvers if the problem is anisotropic due to relativistic beam and/or anisotropic cell spacing. * Update relativistic_space_charge_initialization benchmark * AMReX: Update to latest commit (ECP-WarpX#3021) * Added PlasmaLens class to PICMI (ECP-WarpX#3025) * Added PlasmaLens class to PICMI * Added CI test * Added PICMI input file * Fixed the output dir for the CI test * Add `_plt` to Output File Prefix Co-authored-by: Edoardo Zoni <59625522+EZoni@users.noreply.github.com> * Minor fixes removing warnings from MSVC C++ (ECP-WarpX#3022) * Fix MPI Signal Handling on Perlmutter (ECP-WarpX#3029) * Fix: `MPI_CXX_BOOL` -> `MPI_BYTE` C99 types were aded in MPI-2.2, while Cray's MPICH fork in version 8.1.13 defines `MPI_CXX_BOOL` to `MPI_DATATYPE_NULL` on Perlmutter. We could use `MPI_C_BOOL`, which is technically a `_Bool` from [<cstdbool>](https://en.cppreference.com/w/cpp/header/cstdbool) (deprecated: C++17; removed: C++20) - or we simply do a static assert on `sizeof(bool)` and communicate as a `MPI_BYTE` or `MPI_CHAR`. * Signals: Do no MPI Comms if none is configured * Docs: Link and Explain Allowed Signal Values * Review Comments & Style * Extend `do_pml_Lo/Hi` to MR Levels (ECP-WarpX#2890) * Vay Deposition: Fix SyncCurrent, FFTs (ECP-WarpX#3012) * Implemented the BCK fallback for the ECT solver (ECP-WarpX#3016) * Implemented the BCK fallback for the ECT solver * Ignored an unused variable * Bug fix * Fix issue with preprocessor directive * Added comments * Implemented suggestions from code review * Fixed tilebox * Improved warning * Using WarpX::RecordWarning instead of amrex::Print() * Ignoring RZ * Improving comment * Bug Fix * Lowered warning priority * Ignoring low priority warnings in ECT tests Co-authored-by: lgiacome <lorenzo.giacome@cern.ch> * Signal: Cleanup (Simplify) (ECP-WarpX#3031) Simplify the logic by fusing a loop. * Fix Bug in `WarpX::MoveWindow` (ECP-WarpX#3034) * [pre-commit.ci] pre-commit autoupdate (ECP-WarpX#3039) updates: - [github.com/pre-commit/pre-commit-hooks: v4.1.0 → v4.2.0](pre-commit/pre-commit-hooks@v4.1.0...v4.2.0) Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> * AMReX: Update to latest commit (ECP-WarpX#3037) * RZ + openPMD : don't transpose data, save data with shape (Nm, Nz, Nr) (ECP-WarpX#3030) * part_per_grid/cell : cartesian diag in RZ/openPMD * RZ+openPMD : flexible ZR or RZ order * fix logic if not in RZ * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * fix regression test, remove transpose and refactor * Update Source/Diagnostics/WarpXOpenPMD.cpp * Fix: Doxygen, Consistent Naming, Comments, Style Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Remi Lehe <remi.lehe@normalesup.org> Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> * Remove Nodal Synchronization of J and Rho (ECP-WarpX#3038) * Remove Nodal Sync of J and Rho * Reset Benchmark of reduced_diags_single_precision * Avoid unnecessary construction of CopyParticleAttribs (ECP-WarpX#3042) If it's not used there is no reason to construct a CopyParticleAttribs object. In fact, it could result in a runtime `std::out_of_range` error in `std::map::at()` because `tmp_particle_data` is used in the CopyParticleAttribs constructor, but in `PhysicalParticleContainer::Evolve`, `tmp_particle_data` is properly prepared only when doing back transformed diagnostics. * AMReX/PICSAR: Weekly Update (ECP-WarpX#3046) * [pre-commit.ci] pre-commit autoupdate (ECP-WarpX#3049) updates: - [github.com/hadialqattan/pycln: v1.2.5 → v1.3.1](hadialqattan/pycln@v1.2.5...v1.3.1) Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> * Summit: Prepend Hostname & Mapping (ECP-WarpX#3040) Add an additional `jsrun` command on Summit so that one can easier map the run output to a hostname. Write a `task_host_mapping.txt` file for each run. * Fix a bug about particle weight. (ECP-WarpX#3052) Co-authored-by: Yinjian Zhao <yin@Yinjians-MacBook-Air.local> * add after diagnostic python callback (ECP-WarpX#3043) * Current Deposition Interfaces: Always Pass `dt` & `relative_time` (ECP-WarpX#2937) * Current Deposition Interfaces: Always Pass `dt` & `relative_time` * Fix CI Failures * Fix 1D/RZ Warnings * Fix RZ Bug * Fix Bugs * Minimize Changes, Fix Roundoff Errors * Cleaning * Remove dt From doDepositionShapeN * Cleaning Esirkepov Deposition * Cleaning Vay Deposition * Fix Roundoff Errors * Fix Roundoff Errors (continued) * Fix Bug (RZ) * `Stencil.py`: Follow PEP 8 Coding Style (ECP-WarpX#3055) * `Stencil.py`: Follow PEP 8 Coding Style * Commit Suggestion by @dpgrote * Perlmutter: Boost Software Module (QED) (ECP-WarpX#3053) * Perlmutter: Boost Document a compatible Boost module on Perlmutter. This is needed for detailed table generation for the QED module (`WarpX_QED_TABLE_GEN=ON`). * CMake: Update PICSAR Include a fix for a compile error on CPU for QED table gen. * Docs: Ascent 0.8.0 on Summit (ECP-WarpX#3057) Update the Ascent installation location to use Cyrus' new install for us. * AMReX: Weekly Update (ECP-WarpX#3059) * Doc: PICMI HPC System Update Requirements (ECP-WarpX#3060) Since these requirements (i.e., PICMI) change quite rapidly, document the line close to the `pip` install line. * Add profiling to ParticleBoundaryBuffer::gatherParticles (ECP-WarpX#3061) This turned out to be a major portion of a particle-heavy simulation, and was being entirely attributed to WarpX::Evolve(). * Update CUDA repo key (ECP-WarpX#3069) Nvidia has made changes in the signing keys. https://forums.developer.nvidia.com/t/notice-cuda-linux-repository-key-rotation/212771 Co-authored-by: Edoardo Zoni <59625522+EZoni@users.noreply.github.com> Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja> Co-authored-by: Phil Miller <unmobile+gh@gmail.com> Co-authored-by: Roelof <roelof.groenewald@modernelectron.com> Co-authored-by: Tiberius Rheaume <35204125+TiberiusRheaume@users.noreply.github.com> Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Weiqun Zhang <WeiqunZhang@lbl.gov> Co-authored-by: David Grote <grote1@llnl.gov> Co-authored-by: Lorenzo Giacomel <47607756+lgiacome@users.noreply.github.com> Co-authored-by: lgiacome <lorenzo.giacome@cern.ch> Co-authored-by: Ryan Sandberg <RSandberg@lbl.gov> Co-authored-by: Remi Lehe <remi.lehe@normalesup.org> Co-authored-by: Yinjian Zhao <yinjianzhao@lbl.gov> Co-authored-by: Yinjian Zhao <yin@Yinjians-MacBook-Air.local> Co-authored-by: Roelof Groenewald <40245517+roelof-groenewald@users.noreply.github.com> Co-authored-by: Phil Miller <phil@intensecomputing.com>

ax3l added bug Something isn't working bug: affects latest release Bug also exists in latest release version component: parallelization Guard cell exchanges and particle redistribution labels Apr 6, 2022

ax3l requested a review from PhilMiller April 6, 2022 20:36

ax3l force-pushed the fix-signalHandling branch from 664d267 to 60d47a8 Compare April 6, 2022 20:43

Signals: Do no MPI Comms if none is configured

8815c0c

ax3l added component: core Core WarpX functionality and removed bug: affects latest release Bug also exists in latest release version labels Apr 6, 2022

ax3l changed the title ~~[WIP] Fix MPI Signal Handling on Perlmutter~~ Fix MPI Signal Handling on Perlmutter Apr 6, 2022

ax3l force-pushed the fix-signalHandling branch from 8ee5afc to a114840 Compare April 6, 2022 21:26

Docs: Link and Explain Allowed Signal Values

ddfe999

ax3l force-pushed the fix-signalHandling branch from a114840 to ddfe999 Compare April 6, 2022 21:34

PhilMiller reviewed Apr 6, 2022

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Review Comments & Style

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PhilMiller reviewed Apr 7, 2022

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PhilMiller approved these changes Apr 7, 2022

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RemiLehe approved these changes Apr 7, 2022

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RemiLehe merged commit 85180be into ECP-WarpX:development Apr 7, 2022

ax3l deleted the fix-signalHandling branch April 7, 2022 17:41

ax3l added the component: ABLASTR components shared with other PIC codes label Apr 7, 2022

ax3l assigned RemiLehe Apr 7, 2022

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Fix MPI Signal Handling on Perlmutter #3029

Fix MPI Signal Handling on Perlmutter #3029

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Fix MPI Signal Handling on Perlmutter #3029

Fix MPI Signal Handling on Perlmutter #3029

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ax3l commented Apr 6, 2022 • edited Loading

Fix: MPI_C(XX)_BOOL

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Fix: `MPI_C(XX)_BOOL`

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