How Solver Usage is Charged¶
D-Wave charges you for time that solvers run your problems, with rates depending on QPU usage. Because the QPU usage time of hybrid solvers constitutes just a fraction of the total time —with the rest allocated to usage of classical resources—rates are lower for hybrid-solver time than for QPU time. You can see the rate at which your account’s quota is consumed for a particular solver in the solver’s quota_conversion_rate property.
You can see the time you are charged for in the responses returned for your submitted problems. The relevant field in the response depends on the solver:
- QPU solvers:
'qpu_access_time'. The example in QPU Timing Information from SAPI shows
'qpu_access_time': 9687in the returned response, meaning almost 10 milliseconds are being charged.
- Hybrid solvers:
'charge_time'. The example in Leap’s Hybrid Solvers’ Timing Information shows
'charge_time': 2991424in the returned response, meaning almost 3 seconds are being charged.
For example, for a QPU solver with a quota conversion rate of 1,
a problem that results in a
deducts 1.5 milliseconds seconds from your account’s quota;
for a hybrid solver with a quota conversion rate of 20,
a problem that results in a charge time of 40 seconds,
deducts 2 seconds from your account’s quota.