45 lines
2.3 KiB
Markdown
45 lines
2.3 KiB
Markdown
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---
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title: Gas price oracle
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---
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The gas price oracle is a helper function of the Geth client that tries to find an
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appropriate default gas price when sending transactions. It can be parametrized with the
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following command line options:
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- `gpomin`: lower limit of suggested gas price. This should be set at least as high as the
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`gasprice` setting usually used by miners so that your transactions will not be rejected
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automatically because of a too low price.
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- `gpomax`: higher limit of suggested gas price. During load peaks when there is a
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competition between transactions to get into the blocks, the price needs to be limited,
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otherwise the oracle would eventually try to overbid everyone else at any price.
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- `gpofull`: a block is considered "full" when a certain percentage of the block gas limit
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(specified in percents) is used up by transactions. If a block is not "full", that means
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that a transaction could have been accepted even with a minimal price offered.
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- `gpobasedown`: an exponential ratio (specified in `1/1000ths`) by which the base price
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decreases when the lowest acceptable price of the last block is below the last base
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price.
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- `gpobaseup`: an exponential ratio (specified in `1/1000ths`) by which the base price
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increases when the lowest acceptable price of the last block is over the last base
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price.
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- `gpobasecf`: a correction factor (specified in percents) of the base price. The
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suggested price is the corrected base price, limited by `gpomin` and `gpomax`.
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The lowest acceptable price is defined as a price that could have been enough to insert a
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transaction into a certain block. Although this value varies slightly with the gas used by
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the particular transaction, it is aproximated as follows: if the block is full, it is the
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lowest transaction gas price found in that block. If the block is not full, it equals to
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gpomin.
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The base price is a moving value that is adjusted from block to block, up if it was lower
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than the lowest acceptable price, down otherwise. Note that there is a slight amount of
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randomness added to the correction factors so that your client will not behave absolutely
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predictable on the market.
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If you want to specify a constant for the default gas price and not use the oracle, set
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both `gpomin` and `gpomax` to the same value.
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