frePPLev2.0
open source Production PLanning
  • Home
  • Documentation
    • Getting started
    • Modeling guide
    • User guide
    • Installation guide
    • Developer guide
    • FAQ
  • C++ API

Solver features

Solver

  • Ability to create a constrained plan, respect material supply, available capacity, lead time and release time fence constraints.
  • Ability to create unconstrained plans.
  • Ability to run in multi-threaded mode. Different threads are solving independent sub-problems.

Demand

  • Demand priorities are recognized, such that constraints impact the lowest ranking demands only.
    The default ranking is based on the priority attribute and the due date.
  • Ability to respect different demand policies: In case of a constraint a demand can be allowed to be satisfied late or not. Satisfying the demand in multiple parts can be allowed or not.

Operation

  • Models multiple operation types.
    • Operations with fixed duration.
    • Operations with variable duration, depending on quantity.
    • Alternate operations: When a demand can’t be met from the primary operation the solver will plan on alternative operations.
    • Multi-step routings: An operation can have multiple sub-operations that need to be executed in sequence.
  • Date-effectivity: Depending on the start date (or end date) different operations can be effective.
  • The operations can be planned with a minimum, multiple and maximum lot-size.
  • Pre- and post-operation times used as soft constraints (ie they are respected when feasible but will be reduced when required to meet the demand in time).

Resource

  • Resources loaded during the complete duration of an operation.
  • Resources with finite or infinite capacity.
  • Capacity shortages are solved by moving operations early.
  • Ability to model setup times and conversions between setups.

Buffer

  • Material consumption or production happens at the start or at the end of operations.
  • Buffers with finite or infinite material supply.
  • Ability to specify a desired minimum inventory level, aka safety stock. The minimum level can be time dependent and is treated as a soft constraint (ie will be respected when feasible, but will be violated when constraints prevent meeting it).

Miscellaneous

  • Ability to model working hours and holidays.
    • Getting started
    • Modeling guide
      • Simplified domain model
      • Detailed domain model
      • Environment variables
      • Python interpreter
      • Global parameters
      • Buffer
      • Calendar
      • Customer
      • Demand
      • Flow
      • Item
      • Load
      • Location
      • Operation
      • Suboperation
      • Operationplan
      • Problem
      • Resource
      • SetupMatrix
      • Skill
      • Resource skill
      • Solver
      • Extension modules
        • Forecast module
        • REST web service module
        • Linear programming solver module
        • OpenERP connector module
    • User guide
      • Main features
      • Supported browsers
      • Getting around
        • Logging in
        • Logging out
        • Changing password
        • Navigation
          • Menu bar
          • Jump search
          • Context menus
          • Browser bookmarks
        • Filtering data
        • Sorting data
        • Selecting time buckets
        • Exporting data
        • Importing data
        • User preferences
        • User permissions and roles
      • Screens
        • Data input
        • Supply Path / Where Used
        • Comments
        • History – Audit trail
        • Plan analysis
          • Problem report
          • Constraint report
          • Inventory report
          • Inventory detail report
          • Resource report
          • Resource Gantt report
          • Resource detail report
          • Operation report
          • Operation detail report
          • Demand report
          • Demand detail report
          • Demand Gantt report
          • Forecast report
          • Performance indicator report
        • Execute
      • Batch commands
        • manage.py (manage.exe on Windows)
        • frepple (frepple.exe on Windows)
        • freppleservice.exe (Windows only)
    • Installation guide
      • Windows installer
      • Compiling on Windows
      • Linux binary packages
      • Compiling on Linux
      • Compiling on debian-based linux
      • Compiling on Red Hat based Linux
      • Compiling from the subversion source code repository
      • Running the VMWare virtual machine
      • Other platforms
      • Configuring the user interface
      • Configuring multiple models in the user interface
      • Configuring as a Python extension module
    • FAQ
    • Developer guide
      • Code structure
      • Class diagram
      • Solver
        • Solver features
        • Planning algorithm
          • Top level loop
          • Demand solver
          • Buffer solver
          • Flow solver
          • Load solver
          • Operation solver
          • Resource solver
        • Cluster and level algorithm
      • Extension modules
      • Version control
      • Style guide
      • Portability
      • Security
      • Internationalization
      • Translating the user interface
      • Adding or customizing a report
      • Unit tests
        • buffer_procure_1
        • calendar
        • callback
        • cluster
        • constraints_combined_1
        • constraints_combined_2
        • constraints_leadtime_1
        • constraints_material_1
        • constraints_material_2
        • constraints_material_3
        • constraints_material_4
        • constraints_resource_1
        • constraints_resource_2
        • constraints_resource_3
        • constraints_resource_4
        • constraints_resource_5
        • datetime
        • deletion
        • demand_policy
        • flow_alternate_1
        • flow_alternate_2
        • flow_effective
        • forecast_1
        • forecast_2
        • forecast_3
        • forecast_4
        • forecast_5
        • forecast_6
        • jobshop
        • load_alternate
        • load_effective
        • lpsolver_1
        • multithreading
        • name
        • operation_alternate
        • operation_available
        • operation_effective
        • operation_pre_post
        • operation_routing
        • pegging
        • problems
        • python_1
        • python_2
        • python_3
        • safety_stock
        • sample_module
        • scalability_1
        • scalability_2
        • scalability_3
        • setup_1
        • setup_2
        • skill
        • xml
        • xml_remote
    • License
      • GNU Affero General Public License
      • GNU Free Documentation License
    • Third party add-ons
  • Copyright © 2010-2013 frePPLe bvba