Getting the Best Performance from this Library

By far the most important thing you can do when using this library is turn on your compiler's optimisation options. As the following table shows the penalty for using the library in debug mode can be quite large.

Table 14.1. Performance Comparison of Release and Debug Settings

Function	Microsoft Visual C++ 8.0 Debug Settings: /Od /ZI	Microsoft Visual C++ 8.0 Release settings: /Ox /arch:SSE2
erf	16.65 (1.028e-006s)	1.00 (1.483e-007s)
erf_inv	19.28 (1.215e-006s)	1.00 (4.888e-007s)
ibeta and ibetac	8.32 (1.540e-005s)	1.00 (1.852e-006s)
ibeta_inv and ibetac_inv	10.25 (7.492e-005s)	1.00 (7.311e-006s)
ibeta_inva, ibetac_inva, ibeta_invb and ibetac_invb	8.57 (2.441e-004s)	1.00 (2.847e-005s)
gamma_p and gamma_q	10.98 (1.044e-005s)	1.00 (9.504e-007s)
gamma_p_inv and gamma_q_inv	10.25 (3.721e-005s)	1.00 (3.631e-006s)
gamma_p_inva and gamma_q_inva	11.26 (1.124e-004s)	1.00 (9.982e-006s)

Function

Microsoft Visual C++ 8.0

Debug Settings: /Od /ZI

Microsoft Visual C++ 8.0

Release settings: /Ox /arch:SSE2

erf

16.65

(1.028e-006s)

1.00

(1.483e-007s)

erf_inv

19.28