Enabling Parallel Calc (CALCTASKDIMS)

Question

Hi,I'm looking for information related to the CALCTASKDIMS function. The issue is to identify additional tasks for parallel calculation. As I rode it in DBA guide, Essbase uses the last spare dimension in an outline to identify tasks that can be performed concurrently. But how to know if I need to specify calctaskdms settings a second or a third sparse dimension???Thanks for your helpRegards,Sébastien ROUX

Answer 1

I saw this in DBAGThe 50% empty task ratio pointed out probably is a good goal of tuning with CALCTASKDIMS ? Use this configuration setting only if your outline generates many empty tasks, thus reducing opportunities for parallel calculation. See the Essbase Database Administrator's Guide for more information about what kind of outlines or calculation scripts generate many empty tasks. ? Essbase writes a message to the application log specifying the number of tasksthat can be executed concurrently at any one time (based on the data, not thevalue of CALCPARALLEL or SETCALCPARALLEL):Calculation task schedule [576,35,14,3,2,1]This example message indicates that 576 tasks can be executed concurrently.After these tasks complete, 35 more can be performed concurrently, and so on.The benefits of parallel calculation is greatest in the first few steps, and thenthe benefits taper off because there are fewer and fewer tasks being performedconcurrently.? Essbase writes a message to the application log indicating how many of thetasks are empty (contain no calculations):[Tue Nov 27 12:30:44 2001]Local/CCDemo/Finance/essexer/Info(1012681) Empty tasks [91,1,0,0]In the example log message above, Essbase indicates that 91 of the tasks atlevel zero were empty.If the ratio of empty tasks to the tasks specified in the task schedule is greaterthan 50, then parallelism may not be giving you improved performance,because of the high sparsity in the data model.Steven [email protected]