# Change Log All notable changes to this project will be documented in this file The format is based on [Keep a Changelog](http://keepachangelog.com/). ## [Unreleased] ### Changed - PreInit service now handles the timeout if the synchronous flag is provided ## [2.0.1] 2018-02-27 ### Fixed - MaxParallelism is updated correctly when set and later decreased - AcquireCpus now correctly ignores reclaimed CPUs - Visualization errors parsing `DLB_ARGS` - Removed non intended warning about setting CPUs when using LeWI with MPI support - Several minor fixes ## [2.0] 2017-12-21 ### Added - Callback system - API for subprocesses - New interaction mode choice (synchronous as it was before, or asynchronous) - Doxygen HTML and man pages documentation - Test coverage support - OMPT experimental support ### Changed - API reworked - A petition of a CPU now registers the process into a CPU petition queue. If this CPU becomes available, DLB can schedule which process will acquire it - A petition of an unspecified CPU registers the process into a global petition queue, this queue has less priority than the CPU queue - DLB acquire now does not schedule because it forces the acquisition, DLB Borrow does scheduling but only looks for idle CPUs and never creates a CPU request - DLB options print format reworked, `DLB_ARGS` is now used to pass options to DLB. - Fortran Interface is now provided using an include with ISO C bindings. - Shared Memory synchronization mechanism is now managed using a pthread spinlock - DROM services now use the same shmem handler so no need to call `DLB_Init` and `DLB_DROM_Init` - DROM services Get/Set process mask are now asynchronous functions ### Fixed - Test suite now follows a Unit Testing approach and does not need undocumented external tools - Several minor bugs - PreInit service now correctly handles environment variables and allows forks ### Deprecated - `DLB_MASK` is no longer used, only registered CPUs may be used by other processes - `DLB_DROM_GetCpus` service has been removed - `LB_OPTION` type of environment variables is deprecated ## [1.3.2] - 2017-10-9 ### Fixed - Bug initialing shared memory when using non-mask policies ## [1.3.1] - 2017-10-4 ### Fixed - Bug parsing `DLB_ARGS` ## [1.3] - 2017-07-12 ### Added - This CHANGELOG file - Shared Memory consistency checks upon registration - The binary `dlb_taskset` can now be used to launch processes under DLB - Service `DLB_Barrier` to perform a barrier between all processes in the node - DLB Services now return an error code - New User Option `LB_PRIORITY` to manage how CPUs are distributed according to HW locality - Add services for DROM to PreInit and PostFinalize to manage process that will fork/exec - Add services to check if the process mask needs to be changed ### Changed - Refactor policy based Shared Memory into two general purpose `cpuinfo` and `procinfo` - DROM interface is now considered stable. External processes can manage the CPU ownership of DLB processes - DLB options are now parsed through the environment variable `DLB_ARGS` ### Fixed - Several minor bugs ### Deprecated - Signal handler feature is no longer supported ## [1.2] - 2016-12-23 ### Changed - Improved User Guide - Improved configure script and macros ### Fixed - Compatibility with gcc6 - Compatibility with icc17 - Compatibility with C11 standard - Several minor bugs ## [1.1] - 2016-02-04 ### Added - Policy `Autonomous Lewi Mask` to micro-manage each thread individually - DLB services to init/finalize without MPI support - DLB services to enable/disable or mark a serial/parallel sections of code - DLB service to modify User Options during program execution - New library independent from MPI - Binary `dlb_shm` to manage Shared Memory from CLI - Binary `dlb_taskset` to manage processes' mask from CLI - BG/Q support - Add `LB_MASK` environment variable to specify a `DLB_MASK` common to all processes - Experimental implementation of `DLB_Stats` interface - Experimental implementation of `DLB_DROM` interface - Signal handler feature to clean up DLB on termination - In-code Doxygen documentation - User guide using Sphynx generator - Distributable examples ### Changed - Replace IPC with POSIX Shared Memory - Replace Shared Memory synchronization mechanism from semaphores to pthread mutexes - Shared Memory creation is now decentralized from rank 0 and it will be created when necessary - Shared Memory internal structure reworked to host information about ownership and guesting of CPUs - CPUs from `DLB_MASK` can guest any process, but they will not have an owner - Improve support for detection of Shared Memory runtimes ### Fixed - Compatibility with gcc 4.4 and 4.5 - Compatibility with MPI-3 standard - Fotran interfaces now use the correct types - Several minor bugs ## 1.0 - 2013-12-11 ### Added - DLB Interface - MPI Interception Interface - User options configured by environment variables `LB_*` - Lend When Idle algorithm implementation - DPD - Extrae instrumentation - Paraver configs for DLB events - Inter-Process Communication (IPC) Shared Memory - Inter-Process Communication (IPC) Sockets - Thread binding interface - `LeWI` policies to support SMPSS and OpenMP - `LeWI mask` policy to support OmpSs - RaL and PERaL policies for redistribution of resources - HWLOC optional dependency to query HW info - Scheduling decisions based on HW locality - Binary `dlb` [Unreleased]: https://github.com/bsc-pm/dlb/compare/v2.0...HEAD [2.0.1]: https://github.com/bsc-pm/dlb/compare/v2.0...v2.0.1 [2.0]: https://github.com/bsc-pm/dlb/compare/v1.3...v2.0 [1.3.2]: https://github.com/bsc-pm/dlb/compare/v1.3.1...v1.3.2 [1.3.1]: https://github.com/bsc-pm/dlb/compare/v1.3...v1.3.1 [1.3]: https://github.com/bsc-pm/dlb/compare/v1.2...v1.3 [1.2]: https://github.com/bsc-pm/dlb/compare/v1.1...v1.2 [1.1]: https://github.com/bsc-pm/dlb/compare/v1.0...v1.1