Developer Reference
Visible to Intel only — GUID: GUID-7334E668-83EC-46B1-BA2E-66DC9EC643A4
Ln
Computes a natural logarithm of real vector elements.
Performance:
Intel® Xeon® Processor E5-2680 | Intel® Xeon® Processor E5-2699 v3 | Intel® Xeon® Processor E5-2699 v4 | Intel® Xeon® Gold 6148 Processor | ||
---|---|---|---|---|---|
single | HA | 2.83 | 1.79 | 1.64 | 0.96 |
LA | 2.83 | 1.38 | 1.30 | 0.66 | |
EP | 2.83 | 1.09 | 0.94 | 0.60 | |
double | HA | 6.74 | 6.22 | 5.21 | 2.42 |
LA | 5.89 | 5.13 | 4.39 | 2.11 | |
EP | 5.32 | 4.78 | 4.09 | 1.70 |
Notes:
- Units - CPE (Clocks per Element)
Performance was measured on "working" interval (double precision: [ 0.1, 10000.0 ] for HA and LA, [ 1.2, 10000.0 ] for EP; single precision: [ 0.1, 10000.0 ] for HA and LA, [ 1.2, 10000.0 ] for EP)
Data - vectors of 1000 elements with random generated numbers.
All data was collected with 64-bit libraries.
Accuracy:
Intel® Xeon® Processor E5-2680 | Intel® Xeon® Processor E5-2699 v3 | Intel® Xeon® Processor E5-2699 v4 | Intel® Xeon® Gold 6148 Processor | ||
---|---|---|---|---|---|
single | HA | 0.52 | 0.52 | 0.52 | 0.50 |
LA | 1.04 | 0.67 | 0.67 | 1.02 | |
EP | 1.07E+03 | 1.07E+03 | 1.07E+03 | 12.80 | |
double | HA | 0.50 | 0.50 | 0.50 | 0.50 |
LA | 1.13 | 0.80 | 0.80 | 0.85 | |
EP | 2.62E+03 | 2.62E+03 | 2.62E+03 | 1.84E+05 |
NOTE:
Units - ULP (Units in the Last Place).
Performance Graphs:
Parent topic: Logarithmic