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Update performance metrics page in the book (#5581)

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Justin Starry 2019-08-21 09:59:23 -04:00 committed by GitHub
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@ -7,14 +7,16 @@ confirmed by super majority of the cluster (Confirmation Time).
Each cluster node maintains various counters that are incremented on certain events.
These counters are periodically uploaded to a cloud based database. Solana's metrics
dashboard fetches these counters, and computes the performance metrics and displays
it on the dashboard.
it on the dashboard.
## TPS
The leader node's banking stage maintains a count of transactions that it recorded.
The dashboard displays the count averaged over 2 second period in the TPS time series
graph. The dashboard also shows per second mean, maximum and total TPS as a running
counter.
Each node's bank runtime maintains a count of transactions that it has processed.
The dashboard first calculates the median count of transactions across all metrics
enabled nodes in the cluster. The median cluster transaction count is then averaged
over a 2 second period and displayed in the TPS time series graph. The dashboard also
shows the Mean TPS, Max TPS and Total Transaction Count stats which are all calculated from
the median transaction count.
## Confirmation Time
@ -26,4 +28,4 @@ super majority vote, and when one of its children forks is frozen.
The node assigns a timestamp to every new fork, and computes the time it took to confirm
the fork. This time is reflected as validator confirmation time in performance metrics.
The performance dashboard displays the average of each validator node's confirmation time
as a time series graph.
as a time series graph.