tfchain Difference between the deployment cost from the resource pricing calculator and the actual billing rate of the contract

Difference between the deployment cost from the resource pricing calculator and the actual billing rate of the contract

Open mohamedamer453 opened this issue 1 year ago • 2 comments

What happened?

There's a difference between the calculations done from the resource calculator or manual calculation and the actual billing rate of the contract.

Scenario 1

A micro vm deployment from the playground with the following specs CRU: 1, MR: 1, SRU: 15.

According to the resource calculator the cost should be 387.14 tft/month since i'm eligible for a bronze discount.

so the cost/hour should be = 387.14 / 30 / 24 = 0.5376944444444444 TFT/hour

and when it was calculated manually it was the same thing

1 USD -> 142.857 TFT


CRU = 1
MRU = 1
SRU = 15

CU = min( max(MRU/4, CRU/2), max(MRU/8, CRU), max(MRU/2, CRU/4) )
   = min( max(1/4, 1/2), max(1/8, 1), max(1/2, 1/4) )
   = min( 1/2, 1, 1/2)
   = 1/2

SU = 0/1200 + 15/200
   = 0.075

CU cost/hour = CU * CU pricing
             = 0.5 * 10 musd
             = 5 musd/h
             
SU cost/hour = SU * SU pricing    
             = 0.075 * 5
             = 0.375 musd/h

Contract cost/hour = CU cost/hour + SU cost/hour
                   = 5 musd/h + 0.375 musd/h
                   = 5.375 musd/h
                   = 0.005375 usd/h
                   = 0.005375 * 142.857
                   = 0.7678563749999999 tft/hour
                   = 0.7678563749999999 * 24 * 30
                   = 552.8565899999999 tft/month
                   = 552.8565899999999 * 0.065

Cost with 30% discount = 0.7678563749999999 * 0.7
                       = 0.5374994624999999 TFT/hour

However the actual billing rate of the contract from the playground and graphql is 0.376 tft/hour

Scenario 2

A dedicated node with the following specs CRU = 24, MRU = 188.88, SRU = 476.94, HRU = 8386.56

node 4 on qanet

According to the resource calculator the cost should be 14752.86 TFT/month since i'm not eligible for any discount levels, only the 50% discount of renting a node as dedicated.

so the cost/hour should be = 14752.86 / 30 /24 = 20.490083333333335 TFT/hour

and when it was calculated manually it was the same thing

1 USD -> 142.857 TFT

CRU = 24
MRU = 188.88
SRU = 476.94
HRU = 8386.56

CU = min( max(MRU/4, CRU/2), max(MRU/8, CRU), max(MRU/2, CRU/4) )
   = min( max(188.88/4, 24/2), max(188.88/8, 24), max(188.88/2, 24/4) )
   = min( max(188.88/4, 24/2), max(188.88/8, 24), max(188.88/2, 24/4) )
   = min( max(47.22, 12), max(11.11, 24), max(94.44, 6) )
   = min( 47.22, 24, 94.44)
   = 24

CU cost/hour = CU * CU pricing
             = 24 * 10 musd/h
             = 240 musd/h
             
             
SU = HRU/1200 + SRU/200
   = 8386.56/1200 + 476.94/200
   = 9.3735
SU cost/hour = SU * SU pricing
             = 9.3735 * 5 musd/h
             = 46.8675 musd/h
             
             
Contract cost/hour = CU cost/hour + SU cost/hour
                   = 240 + 46.8675
                   = 286.8675 musd/h
                   = 0.2868675 usd/h
                   = 0.2868675 * 142.857
                   = 40.9810304475 tft/h
                   = 40.9810304475 * 24 * 30
                   = 29506.3419222 tft/month
                   = 206.54459999999997 usd/month
                   
Cost with 50% discount = 40.9810304475 * 0.5
                       = 20.49051522375 tft/h

However the actual billing rate of the contract from the playground and graphql is 14.343 tft/hour