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Cost model uses compute_unit to replace microsecond as cost unit (#18934)

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* wip - cost_update_services to log both us and cu for each instruction to determine possible ratio

* replace microsecond with compute_unit as cost unit
This commit is contained in:
Tao Zhu
2021-07-29 17:19:36 -05:00
committed by GitHub
parent ef17cf3bdb
commit 5d297ccf96
2 changed files with 22 additions and 12 deletions
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21
core/src/cost_model.rs
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@@ -12,19 +12,26 @@ use log::*;
use solana_sdk::{pubkey::Pubkey, sanitized_transaction::SanitizedTransaction};
use std::collections::HashMap;
// Guestimated from mainnet-beta data, sigver averages 1us, average read 7us and average write 25us
// 07-27-2021, compute_unit to microsecond conversion ratio collected from mainnet-beta
// differs between instructions. Some bpf instruction has much higher CU/US ratio
// (eg 7vxeyaXGLqcp66fFShqUdHxdacp4k4kwUpRSSeoZLCZ4 has average ratio 135), others
// have lower ratio (eg 9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9PusVFin has an average ratio 14).
// With this, I am guestimating the flat_fee for sigver and account read/write
// as following. This can be adjusted when needed.
const SIGVER_COST: u64 = 1;
const NON_SIGNED_READONLY_ACCOUNT_ACCESS_COST: u64 = 7;
const NON_SIGNED_WRITABLE_ACCOUNT_ACCESS_COST: u64 = 25;
const NON_SIGNED_READONLY_ACCOUNT_ACCESS_COST: u64 = 1;
const NON_SIGNED_WRITABLE_ACCOUNT_ACCESS_COST: u64 = 2;
const SIGNED_READONLY_ACCOUNT_ACCESS_COST: u64 =
SIGVER_COST + NON_SIGNED_READONLY_ACCOUNT_ACCESS_COST;
const SIGNED_WRITABLE_ACCOUNT_ACCESS_COST: u64 =
SIGVER_COST + NON_SIGNED_WRITABLE_ACCOUNT_ACCESS_COST;
// Sampled from mainnet-beta, the instruction execution timings stats are (in us):
// min=194, max=62164, avg=8214.49, med=2243
pub const ACCOUNT_MAX_COST: u64 = 100_000_000;
pub const BLOCK_MAX_COST: u64 = 2_500_000_000;
// 07-27-2021, cost model limit is set to "worst case scenario", which is the
// max compute unit it can execute. From mainnet-beta, the max CU of instruction
// is 3753, round up to 4_000. Say we allows max 50_000 instruction per writable i
// account, and 1_000_000 instruction per block. It comes to following limits:
pub const ACCOUNT_MAX_COST: u64 = 200_000_000;
pub const BLOCK_MAX_COST: u64 = 4_000_000_000;
const MAX_WRITABLE_ACCOUNTS: usize = 256;