gas3.py

#!/usr/bin/env python3

precommitGas = 9000000
provecommitGas = 40000000
windowpostGas = 512265727
sectorsInPartition = 2349
maxSectorsPerWindowPost = 10000
sectorSize = 32
blockLimitGas = 10e9
tipset = 5
## rate at which the network grows in size each day in Gb
## 10 Pb
growthRateDay = 20 * 1024 * 1024
## rate for each block in GB
growthRateBlock = growthRateDay / 24 / 60 / 2 
## number of precommit for 32GB sectors
growthPreCommit = growthRateBlock / sectorSize
growthProveCommit = growthPreCommit
maxdeadline = 48
roundsInDeadline = 30 * 2
## fillingPerc assumes that all the blocks in the tipset contains transactions
## that uses only this percentage of the maximum gas available.
## If you take 1/tipset, it means you only use one block worth of gas for example
fillingPerc = 0.30

print("Filling percentage of tipset: ", fillingPerc*100, "%")
print("Daily growth rate of",growthRateDay, "GB")
print("Number of pre + prove commit per block: ",2 * int(growthPreCommit))

bb = 1024 
def gbToEB(gb):
    return gb/bb/bb/bb

def ebToGB(eb):
    return eb * bb * bb * bb


def windowPostToSectors(nbWindowPost):
    return nbWindowPost * maxSectorsPerWindowPost

def sectorsToWindowPost(nbSectors):
    return max(1, nbSectors / maxSectorsPerWindowPost)

totalSectors = 0
rounds = 0
deadline = 0
## contains the number of sectors to prove at each deadline
toProve = dict.fromkeys(range(0,maxdeadline),0)
while True:
    ## since we have the growthPreCommit = growthProveCommit
    growthGas = growthPreCommit * (precommitGas + provecommitGas)
    ## how many gas can we use in the tipset
    gasLeft = blockLimitGas * fillingPerc * tipset - growthGas
    ## we prove sectors spreaded over all the rounds in the deadline
    nbWindowPost = sectorsToWindowPost(toProve[deadline]) / roundsInDeadline
    gasWindow = windowpostGas * nbWindowPost
    ## we don't have enough place to prove all sectors anymore
    if gasWindow > gasLeft:
        break

    totalSectors += growthPreCommit
    rounds += 1
    ## register the new sectors for proving in 24h
    toProve[(deadline - 1) % maxdeadline] += growthProveCommit
    ## we increase the deadline when we have passed 60 rounds
    if rounds % roundsInDeadline == 0:
        deadline = (deadline + 1) % maxdeadline

print("How many rounds until full of windowpost: ",rounds)
print("How much time this takes (years): %.2f" % (rounds / 2 / 60 / 24 / 365))
print("How many sectors emboarded: ", int(totalSectors))
print("How much storage this means (EB): %.2f" % gbToEB(totalSectors * 32))