Maximum Linear Solve Iterations

Maximum Linear Solve Iterations = <integer>

Description / Usage

This optional card limits the maximum number of iterations used by iterative linear solver algorithms. The input parameter is defined as

<integer>

<integer> n, any positive integer ( n > 0 ) that specifies the maximum number of iterations.

If the Maximum Linear Solve Iterations card is omitted, the default selection is 500.

Examples

Following is a sample card:

Maximum Linear Solve Iterations = 5

Technical Discussion

If the linear system can be solved within a specified tolerance (see the Residual Ratio Tolerance card) in less than n iterations, then a normal return from Aztec occurs and the actual number of iterations required to obtain convergence will be printed on the status line. If the specified convergence tolerance is not met within n iterations, then an abnormal return status occurs and, in place of the number of iterations, the string “max” will be printed on the status line under the LIS (linear iteration status) heading. Other abnormal returns from Aztec are possible and are indicated on the LIS status line; see the Aztec User’s Guide (Hutchinson, Shadid and Tuminaro, 1995) for further interpretation of different abnormal return status indicators.

References

SAND95-1559: Aztec User’s Guide Version 1.0, Sandia Internal Report, Hutchinson, S. A., Shadid, J. N. and Tuminaro, R. S., 1995.