The Data EngineeringBeta

Model

Effective price

Compute sells capacity-time, so the vendor charges you for your own utilization.

effective price = \frac{list rate}{utilization ( 1 - granularity waste )}

Trade-off: Isolation vs. utilization

How it behaves

One input on the horizontal axis, the others held fixed.

Data table

Price per useful hour by utilization ($1 per hour list)
Utilization	$ per useful hour
0.05	20
0.062	16.2
0.074	13.6
0.086	11.7
0.098	10.3
0.109	9.14
0.121	8.25
0.133	7.51
0.145	6.9
0.157	6.37
0.169	5.93
0.181	5.54
0.193	5.19
0.204	4.89
0.216	4.62
0.228	4.38
0.24	4.17
0.252	3.97
0.264	3.79
0.276	3.63
0.287	3.48
0.299	3.34
0.311	3.21
0.323	3.09
0.335	2.99
0.347	2.88
0.359	2.79
0.371	2.7
0.382	2.61
0.394	2.54
0.406	2.46
0.418	2.39
0.43	2.33
0.442	2.26
0.454	2.2
0.466	2.15
0.477	2.09
0.489	2.04
0.501	2
0.513	1.95
0.525	1.9
0.537	1.86
0.549	1.82
0.561	1.78
0.573	1.75
0.584	1.71
0.596	1.68
0.608	1.64
0.62	1.61
0.632	1.58
0.644	1.55
0.656	1.53
0.667	1.5
0.679	1.47
0.691	1.45
0.703	1.42
0.715	1.4
0.727	1.38
0.739	1.35
0.751	1.33
0.763	1.31
0.774	1.29
0.786	1.27
0.798	1.25
0.81	1.23
0.822	1.22
0.834	1.2
0.846	1.18
0.857	1.17
0.869	1.15
0.881	1.13
0.893	1.12
0.905	1.1
0.917	1.09
0.929	1.08
0.941	1.06
0.953	1.05
0.964	1.04
0.976	1.02
0.988	1.01
1	1

Worked examples, recomputed

Every number the mechanisms quote for this relationship is recomputed from it, so none of them disagrees with it.

Where it appears

Each mechanism states it in its own names. The general symbol each name stands for is shown with it.

Cost Mechanics
What is metered, and what is the smallest increment you are charged for?
$effective price = list rate \div utilization$
Read it in place →

Differential-privacy noise and budget

Previous Page

Elastic or provisioned

Next Page