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solana-with-rpc-optimizations
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show rent model (#7410)

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Rob Walker 2019-12-10 14:50:55 -08:00 committed by GitHub
parent 96c08cd295
commit 7d6777a96f
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1 changed files with 35 additions and 42 deletions
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77
sdk/src/rent.rs
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@ -129,46 +129,39 @@ mod tests {
);
}
// uncomment me and make my eprintlns macros
// #[test]
// fn test_rent_model() {
// use crate::timing::*;
//
// const SECONDS_PER_YEAR: f64 = (365.25 * 24.0 * 60.0 * 60.0);
// const SLOTS_PER_YEAR: f64 =
// SECONDS_PER_YEAR / (DEFAULT_TICKS_PER_SLOT as f64 / DEFAULT_TICKS_PER_SECOND as f64);
//
// let rent = Rent::default();
//
// eprintln();
// // lamports charged per byte per slot at $1/MByear, rent per slot is zero
// eprintln(
// "{} lamports per byte-slot, rent.due(): {}",
// (1.0 / SLOTS_PER_YEAR) * DEFAULT_LAMPORTS_PER_BYTE_YEAR as f64,
// rent.due(0, 1, 1.0 / SLOTS_PER_YEAR).0,
// );
// // lamports charged per byte per _epoch_ starts to have some significant digits
// eprintln(
// "{} lamports per byte-epoch, rent.due(): {}",
// (1.0 / SLOTS_PER_YEAR)
// * (DEFAULT_LAMPORTS_PER_BYTE_YEAR * DEFAULT_SLOTS_PER_EPOCH) as f64,
// rent.due(
// 0,
// 1,
// (1.0 / SLOTS_PER_YEAR) * DEFAULT_SLOTS_PER_EPOCH as f64
// )
// .0,
// );
// // have a look at what a large-ish sysvar would cost, were it a real account...
// eprintln(
// "stake_history: {}kB == {} lamports per epoch",
// crate::sysvar::stake_history::StakeHistory::size_of() / 1024,
// rent.due(
// 0,
// crate::sysvar::stake_history::StakeHistory::size_of(),
// (1.0 / SLOTS_PER_YEAR) * DEFAULT_SLOTS_PER_EPOCH as f64
// )
// .0,
// );
// }
#[ignore]
#[test]
#[should_panic]
fn show_rent_model() {
use crate::{clock::*, sysvar::Sysvar, timing::*};
const SLOTS_PER_YEAR: f64 =
SECONDS_PER_YEAR / (DEFAULT_TICKS_PER_SLOT as f64 / DEFAULT_TICKS_PER_SECOND as f64);
let rent = Rent::default();
panic!(
"\n\n\
==================================================\n\
empty account, no data:\n\
\t{} lamports per epoch, {} lamports to be rent_exempt\n\n\
stake_history, which is {}kB of data:\n\
\t{} lamports per epoch, {} lamports to be rent_exempt\n\
==================================================\n\n",
rent.due(
0,
0,
(1.0 / SLOTS_PER_YEAR) * DEFAULT_SLOTS_PER_EPOCH as f64,
)
.0,
rent.minimum_balance(0),
crate::sysvar::stake_history::StakeHistory::size_of() / 1024,
rent.due(
0,
crate::sysvar::stake_history::StakeHistory::size_of(),
(1.0 / SLOTS_PER_YEAR) * DEFAULT_SLOTS_PER_EPOCH as f64,
)
.0,
rent.minimum_balance(crate::sysvar::stake_history::StakeHistory::size_of()),
);
}
}