| # Multiple bshells concept To improve processing speed, some planning runs can run in parallel on multiple processors (CPUs). To do this, set these sessions to run in multiple bshells. Each bshell can run on its own CPU. This section describes the general concept. For information on the setup, refer to To set up multiple bshells for planning. Application of the multiple-bshell concept Multiple bshells are available for the following sessions: Generate Order Planning (cprrp1210m000) Initialize, Roll, and Update Scenario (cprpd4200m000) Generate Pegging Relations (cprrp0240m000) Generate Planned Supply based on Forecast (cpvmi1211m000) Note The process that transfers planned orders to the execution level can only use one bshell. Distribution of items over bshells The order planning process takes the plan item's phase number into account. The planning of plan items with phase number 1 cannot start until all plan items with phase number 0 have been planned; otherwise, some dependent demand might be missing for the second level. If you use multiple bshells, ERP LN completes the following steps: ERP LN dynamically calculates an optimal workload for the bshell, but the Workload per Server field in the Performance Parameters (cpcom0100m000) session restricts this number to a maximum, such as 500 different plan items. ERP LN assigns a batch of plan items with phase number 0 to the first bshell. ERP LN assigns a second batch of plan items with phase number 0 to the second bshell, and so on; in this way, all plan items with phase number 0 are distributed over the bshells. To plan the assigned plan items, all available bshells work in parallel. When all plan items with phase number 0 have been planned, ERP LN assigns batches of plan items with phase number 1 to the bshells, followed by the plan items with phase number 2, and so on. Performance aspects Effect on CPU: Yes Effect on database growth: Not applicable Related topics To set up multiple bshells for planning RRP run, Parallel Processing Planning sequence and phase numbers |