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* CarpetLib: Use timing routines from FFTW libraryErik Schnetter2008-01-14
| | | | | | | | | | Use the timing routines from FFTW library. These contain platform-specific code for many different platforms. Remove parameter timestat_timer, since the timer is now chosen automatically. darcs-hash:20080114150519-dae7b-d979aa53a1470335b3ace353e862eef13670958d.gz
* CarpetLib: Set number of OpenMP threads via an external function callErik Schnetter2008-01-14
| | | | | | | Set the number of OpenMP threads via an external function call instead of via a CarpetLib parameter. darcs-hash:20080114150439-dae7b-a6a6a629162ca195411852823e1ece0a2071d771.gz
* CarpetLib: Add support for OpenMPErik Schnetter2007-08-21
| | | | | | | | | | | Add #pragma omp statements for loops in reduction and prolongation operators. Change loop control variables to signed types. Add functions to determine the number of active threads. Add a parameter to set the number of threads if desired. darcs-hash:20070821185237-dae7b-56827b72a69b5fa1b3d1316379a0f155696b4cb2.gz
* CarpetLib: Remove old parametersErik Schnetter2007-04-19
| | | | darcs-hash:20070419013528-dae7b-09f603af91ed987e74f3cb67d417b9745e4070b6.gz
* CarpetLib: Simplify timer interfaceErik Schnetter2007-03-12
| | | | | | | | | | | Remove some parameters which are not necessary: CarpetLib::print_timestats CarpetLib::timestat_disable Allow the value -1 as well as 0 to disable output for timers and memory statistics. darcs-hash:20070312160854-dae7b-6c60bf0c64a5cac03da97595bb30bb2b47568165.gz
* CarpetLib: Add rtc timer on AIXErik Schnetter2007-03-06
| | | | darcs-hash:20070306011837-dae7b-600bdffcf60d6dff9386180543c3dc7ecf9f4028.gz
* CarpetLib: Optimise dh class furtherErik Schnetter2007-03-04
| | | | | | | | | | | Reduce the number of bbox operations while setting up the communication schedule. Cache some results. Introduce timers throughout. Introduce a parameter CarpetLib::check_bboxes, defaulting to "yes", which can be used to disable the self-checks. darcs-hash:20070304210744-dae7b-1a2756dc0aa2f30b2f1311a9475c2a35513f2cfc.gz
* CarpetLib: Use rdtsc instead of MPI_Wtime as default timerErik Schnetter2007-02-04
| | | | darcs-hash:20070204212619-dae7b-f68201db57954ecac2ed7d77dcac9c43f267af64.gz
* CarpetLib: Improve timersErik Schnetter2007-02-03
| | | | | | | | | | | | Implement a second timer based on Intel's rdtsc instruction, which is much faster and much more accurate than MPI_Wtime. Place the timer classes into the CarpetLib namespace. Create a TimerSet class. Make the Timer class automatically register all timers with a singleton object, removing all global variables. darcs-hash:20070203211128-dae7b-42765e79446eda6a2337ba22cd390869055c555a.gz
* CarpetLib: Reorganise prolongation and restriction operatorsErik Schnetter2007-01-12
| | | | | | | | | | | | | | | | | | | | | | | | Reorganise prolongation and restriction operators. This is a major implementation change. Most operators are now written as C++ templates instead of as Fortran 77 code. This simplifies the code, since C++ routines can be called more easily, and they also have access to CarpetLib's high-level data structures. Previously, the operators combined temporal and spatial interpolation. Now, time interpolation and space interpolation are handled separately. This may be less efficient, but simplifies the code significantly, since there are now N+M instead of N*M routines, for N time interpolation and M space interpolation methods. Remove the minmod prolongation operator, which was previously disabled. Add support for cell centering, using a method described by Simon Hern, and suggested for Carpet by Ian Hawke. darcs-hash:20070112205812-dae7b-5329795aa698e7bbc3671b1504134885dd830238.gz
* CarpetLib: Make many MPI experiments configurableErik Schnetter2006-12-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add new parameters: BOOLEAN interleave_communications: Try to interleave communications with each other; each processor begins to communicate with its 'right neighbour' in rank, instead of with the root processor BOOLEAN vary_tags: Use different tags for each communication BOOLEAN barrier_between_stages: Add a barrier between the communication stages (slows down, but may make timing numbers easier to interpret) BOOLEAN combine_sends: Send data together and in order of processor ranks BOOLEAN reduce_mpi_waitall: Call MPI_Waitall only for requests that are not null BOOLEAN use_mpi_send: Use MPI_Send instead of MPI_Isend BOOLEAN use_mpi_ssend: Use MPI_Ssend instead of MPI_Isend darcs-hash:20061206165333-dae7b-8ba40bd19fb1733336e60cb7e6bfa0ebfe0d546d.gz
* CarpetLib: Write timer output to filesErik Schnetter2006-09-11
| | | | | | | | Write the CarpetLib timer output to files instead of to screen; the output is lengthy, difficult to interpret, and output from all processors is needed. darcs-hash:20060911025609-dae7b-c1d812ae44dfdb3f8e8daae09f06a8ed3476e73f.gz
* CarpetLib: Split recompose functions into regrid and recomposeErik Schnetter2006-09-04
| | | | | | | | | | | | | | | Split recompose functions into two stages, regrid and recompose. The first stage, regrid, changes the grid structure in the gh and dh classes. The second stage, recompose, changes the values of the actual grid functions, i.e., changes the gf<T> and data<T> objects. The second stage has to be called individually for every refinement level. This is necessary since the boundary conditions need to be applied after recomposing one refinement level, before the next fine refinement level can be recomposed. darcs-hash:20060904230433-dae7b-3ba1982460f57b34da11a6fbb6b4b524dc5b348f.gz
* CarpetLib: Extend timing statisticsErik Schnetter2006-07-31
| | | | | | | | | | Add timers for the new communication infrastructure. Enhance the timers to also track the minimum and maximum time spent. Add a parameter to output timing information to files. darcs-hash:20060731152618-dae7b-1d049b2b37397610c14648078fd0ee92f252ca2a.gz
* CarpetLib: Rename default memory statistics fileErik Schnetter2006-07-31
| | | | darcs-hash:20060731152547-dae7b-c56f2acaf72d2d21d2e4bdee00691866568af6fc.gz
* CarpetLib: Poison newly allocated memory if desiredErik Schnetter2006-07-31
| | | | | | | | | Poison newly allocated memory if desired. This is potentially more thorough that Carpet's poisoning, since it is applied to all allocated memory. It is not applied after time level cycling, though, so it cannot replace Carpet's poisoning. darcs-hash:20060731152325-dae7b-d039ee958161690c9430e70a8051d400273b819e.gz
* CarpetLib: Correct grammatical error in parameter descriptionErik Schnetter2006-07-31
| | | | darcs-hash:20060731151302-dae7b-555810bfd094f8acb70b3dc90c2775ab84a20ef7.gz
* CarpetLib: Check for proper nestingErik Schnetter2006-05-08
| | | | darcs-hash:20060508154323-dae7b-30f14d75440c10774cd9f386bcfaca77fe3e704d.gz
* CarpetLib: Make omit_prolongation_points_when_restricting steerableErik Schnetter2006-05-08
| | | | darcs-hash:20060508154248-dae7b-a4d6c2b35d559cf0e61adae9f580905fa7771235.gz
* CarpetLib: Add boolean parameter "omit_prolongation_points_when_restricting"Erik Schnetter2006-05-03
| | | | | | | | | | | | | | Add a parameter "omit_prolongation_points_when_restricting" that controls whether to restrict to points that are used for boundary prolongation. The default is "no", restoring Carpet's behaviour from before the patch "CarpetLib: Do not restrict to points that are used for boundary prolongation". When set to yes, then there is still a logic error in the code on multiple processors, leading to different restriction regions on different numbers of processors. darcs-hash:20060503235940-dae7b-4c124e68e4c2519c0f97d416e0a7fa3489c1441d.gz
* CarpetLib: Mark more parameters as steerableErik Schnetter2006-02-08
| | | | darcs-hash:20060208233203-dae7b-c3837264ceeca33579afa2bfcb45c8d10803ac0e.gz
* CarpetLib: Output memory statistics to fileErik Schnetter2005-11-19
| | | | | | | Add new parameter CarpetLib::memstat_file. If set, then memory statistics are periodically written to this file. darcs-hash:20051119201538-dae7b-88c8b8cd5b9d2643d1be6e682f2aa32e7a00ef2d.gz
* CarpetLib: Implement fast recomposingErik Schnetter2005-08-11
| | | | | | | | For each refinement level that is to be recomposed, check whether it has the same structure as before, and if so, do nothing. This is controlled by a new flag CarpetLib::fast_recomposing. darcs-hash:20050811120347-891bb-f937c21ddeac7d909cae41d487e9fd74a5ce8cc8.gz
* CarpetLib: Change default settings for the communication tuning parametersErik Schnetter2005-08-08
| | | | | | | These default settings are now believed to be sensible and safe for everybody. darcs-hash:20050808132929-891bb-48231878e0a5ea02312823f4b96cad1c79fdba9f.gz
* CarpetLib: Output memory statistics, and limit maximum memory usageErik Schnetter2005-07-27
| | | | | | | | | | | | Introduce a new parameter print_memstats_every. When non-zero, output the current and total allocated amount of memory (per process). Introduce a new parameter max_allowed_memory_MB. When more than that amount should be allocated on the current processor, abort the run. Only memory for grid variables counts; memory for administrative overhead is ignored. darcs-hash:20050727201851-891bb-c1ff9fc30ff949d576d500fbf70ad7fb5084836a.gz
* CarpetLib: clean-up of communication scheme for individual sends/recvs on ↵Thomas Radke2005-05-26
| | | | | | | | | | | | | | | | | | | | single components The default communication scheme in Carpet (which does an individual send/recv operation for each component) comes with two parameters for fine tuning: CarpetLib::use_lightweight_buffers CarpetLib::combine_recv_send the defaults of which are set to use a well-tested but also slower communication pattern (as turned out during benchmark runs). This patch cleans up the implementation of this communication scheme so that the fastest communication pattern (combined posting of send/recv; use of lightweight buffers) is now always used. The above parameters therefore became obsolete and shouldn't be used anymore in parfiles. darcs-hash:20050526114253-776a0-780933a1539a260d74da8b92522fa2f48c714964.gz
* CarpetLib: change the default for CarpetLib::use_waitall from "no" to "yes"Thomas Radke2005-04-11
| | | | | | | | Using CarpetLib::use_waitall = "yes" seems to improve Carpet performance both for the standard and for the collective buffers communication scheme. So I made it the default. darcs-hash:20050411173355-776a0-a1046bde7c4ccb4eebc00765b4264701b012c8d8.gz
* Carpet/CarpetLib: deactivate CarpetLib::minimise_outstanding_communicationsThomas Radke2005-04-11
| | | | | | | | | | | | | | The code to minimise the number of outstanding communication requests is superseded by the collective buffers communication code. Therefore the corresponding parameter has been deactivated (but not removed in order to keep backwards compatibility with older checkpoints). It is marked as deprecated in the param.ccl file and should not be used anymore (use CarpetLib::use_collective_communication_buffers instead). A level-2 warning of that meaning is printed at startup if the parameter is still set in a user's parfile. darcs-hash:20050411155524-776a0-ed9919869cc1f2821ab8b2fa23b4abea203b72ed.gz
* CarpetLib, Carpet: implement and use collective communication buffersThomas Radke2005-03-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Collective buffers are used to gather all components' data on a processor before it gets send off to other processors in one go. This minimizes the number of outstanding MPI communications down to O(N-1) and thus improves overall efficiency as benchmarks show. Each processor allocates a pair of single send/recv buffers to communicate with all other processors. For this the class (actually, the struct) comm_state was extended by 3 more states: state_get_buffer_sizes: accumulates the sizes for the send/recv buffers state_fill_send_buffers: gathers all the data into the send buffers state_empty_recv_buffers: copies the data from the recv buffer back into the processor's components Send/recv buffers are exchanged during state_fill_send_buffers and state_empty_recv_buffers. The constructor for a comm_state struct now takes an argument <datatype> which denotes the CCTK datatype to use for the attached collective buffers. If a negative value is passed here then it falls back to using the old send/recv/wait communication scheme. The datatype argument has a default value of -1 to maintain backwards compatibility to existing code (which therefore will keep using the old scheme). The new communication scheme is chosen by setting the parameter CarpetLib::use_collective_communication_buffers to "yes". It defaults to "no" meaning that the old send/recv/wait scheme is still used. So far all the comm_state objects in the higher-level routines in thorn Carpet (restriction/prolongation, regridding, synchronization) have been enabled to use collective communication buffers. Other thorns (CarpetInterp, CarpetIO*, CarpetSlab) will follow in separate commits. darcs-hash:20050330152811-776a0-51f426887fea099d1a67b42bd79e4f786979ba91.gz
* Carpet/CarpetLib: minimise the number of outstanding communication requeststradke2005-03-11
| | | | | | | | | | | | | | | | | | | | | | | This patch greatly reduces the number of outstanding MPI_Isend/MPI_Irecv communication requests by moving the loop over comm_states (recv,send,wait) from the outermost to the innermost. This resolves problems with certain MPI implementations (specifically LAM, MPICH-NCSA, and Mvapich over Infiniband) which potentially resulted in some communication buffer overflow and caused the Cactus application to abort or hang forever. Preliminary benchmarks with BSSN_MoL show that the patch does not have a negative impact on myrinet clusters (measured to 64 processors). It even improves the Carpet performance on GigE clusters (measured up to 16 processors). The order of the communication loops is controlled by the boolean parameter CarpetRegrid::minimise_outstanding_communications which defaults to "no" (preserving the old behaviour). darcs-hash:20050311160040-3fd61-04d40ac79ef218252f9364a8d18796e9b270d295.gz
* CarpetLib: Add lightweight communication buffers (untested)Erik Schnetter2005-01-02
| | | | | | | | | | | Lightweight communication buffers use essentially only a vector<T> instead of a data<T> to transfer data between processors. This should reduce the computational overhead. Set the parameter "use_lightweight_buffers" to use this feature. This feature is completely untested. darcs-hash:20050102173524-891bb-6a3999cbd63e367c8520c175c8078374d294eaa8.gz
* global: Remove $Header$ keywords from Carpet arrangementErik Schnetter2005-01-01
| | | | darcs-hash:20050101162121-891bb-ac9d070faecc19f91b4b57389d3507bfc6c6e5ee.gz
* CarpetLib: Collect more timing statisticsErik Schnetter2004-12-30
| | | | | | | | | | | | | Collect more timing statistics in the data class. Print these statistics to stdout when the Cactus parameter print_timestats is set. Create a timer class "timestat". This is a timer that can be started, stopped, and it prints the total time as well as some statistics. For memory allocation statistics, count the number of objects as well as the number of bytes. darcs-hash:20041230212136-891bb-c14edfa7d539ae9b135eee76afadaad51fd0b098.gz
* CarpetLib: Introduce parameter to post MPI_Irecv and MPI_Isend at the same timeErik Schnetter2004-12-08
| | | | | | | | | Introduce parameter a parameter to post MPI_Irecv and MPI_Isend at the same time. Use two queues instead of one vector to store the MPI_Requests. darcs-hash:20041208222541-891bb-c7c8994a0c41b6cfb37f6dc023bc1172238f3619.gz
* CarpetLib: Add parameter specifying how many MPI tags to useErik Schnetter2004-12-08
| | | | darcs-hash:20041208222503-891bb-ac6173fd6d238be4a3325e839ff83d84032f7184.gz
* CarpetLib: Implement using MPI_Waitall for communicatingErik Schnetter2004-11-24
| | | | | | | | Add a parameter CarpetLib::use_waitall that switches from using a series of MPI_Wait statements to using a single MPI_Waitall statement. This might improve performance on many processors. darcs-hash:20041124235118-891bb-034efea054db236a187022b1858e4574da867fa3.gz
* Remove CVS header tagsErik Schnetter2004-09-18
| | | | | | Replace all CVS header tags with the standard "$Header:$". darcs-hash:20040918132147-891bb-dea889bdd94a479ec412d14d08e9efca63e5c24d.gz
* Add option to use less memory during regridding.schnetter2004-05-21
| | | | | | | | | Add option to use less memory during regridding. Some more internal consistency checks. Some reformatting. darcs-hash:20040521161341-07bb3-de11e460fb175d3dbbd94708730c18a6e94e370a.gz
* Make many parameters steerableschnetter2004-03-23
| | | | darcs-hash:20040323105617-07bb3-989cb5fce803f3d82c953d3403a4fa55143a3f0f.gz
* Many changes that accumulated while Cactus and Carpet diverged.schnetter2003-11-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Many changes that accumulated while Cactus and Carpet diverged. Add processor splitting mechanism "along-dir" that splits along a specified direction. Rename group PostRestrict to bin POSTRESTRICT. Prolongate initial data only when desired. This saves much time. Sorry, Ian. Fix bug in time level cycling of grid arrays. (Note: grid arrays should not have time levels.) Fix time_t bug on IRIX. Make sure that there is no integer overflow when there are many refinement levels. Always put parentheses around (maxreflevelfact/reflevelfact). Fix typo in Carpet verbose output. Add debug output in processor splitting. Communicate in three stages: Irecv, (work), Isend, Wait. This might be more efficient. Much more, potentially. Fix bug in processor layout of grid arrays. Sorry, Ian. Make the interpolator interpolate between time levels. Untested. Fix bug in processor communication in interpolator. Sorry, Ian. Rewrite prolongation operators to make them twice as fast. There you are, Ian. Move prolongation operator kind handling from data to gdata. Add official hyperslabbing interfaces to CarpetSlab. Adapt to new cGH * handling. darcs-hash:20031105151837-07bb3-758a87ff0355dba053269df4b7d7d79bea018669.gz
* Fix the casing of the postrestrict group to PostRestrict. Update allschnetter2003-07-20
| | | | | | | | | | | | | Fix the casing of the postrestrict group to PostRestrict. Update all schedule.ccl files accordingly. Introduce a Carpet parameter buffer_width. This parameter specifies a region within refined grids that is also boundary-prolongated. Introduce a function CarpetEnableProlongation to dis- and re-enable boundary prolongation. darcs-hash:20030720190343-07bb3-0c5db5cebe769c0d4b3237f11a089aab9da94b1a.gz
* Introduce a buffer zone between the prolongation destination andschnetter2003-07-16
| | | | | | | | Introduce a buffer zone between the prolongation destination and restriction source grid points. Set its width to 2 by default. This seems to be necessary for second order convergence. darcs-hash:20030716194558-07bb3-d34ffc034cb54e4dcce2e2be2bd378184a79304e.gz
* Changed preprocessor debug flag into Cactus parameter.schnetter2002-10-24
| | | | darcs-hash:20021024093634-07bb3-6dc62f813ca204111874c1913d45965eaa6371ba.gz
* Made WaveToyF77 run on multiple processors with CarpetSlab.eschnett2001-03-07
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* Initial revisioneschnett2001-03-01
| | | | darcs-hash:20010301124010-f6438-fca5ed1e25f84efd816aa0d13fc23b58add7195d.gz
* Initial revisioneschnett2001-03-01
darcs-hash:20010301114010-f6438-12fb8a9ffcc80e86c0a97e37b5b0dae0dbc59b79.gz
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