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avoid divide by zero, limits user weight to EPSILON

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zonyitoo
2021-05-07 13:43:40 +08:00
parent b06391c7b3
commit 9ef26b57e4
1 changed files with 5 additions and 1 deletions
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6
crates/shadowsocks-service/src/local/loadbalancing/server_stat.rs
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@@ -73,6 +73,10 @@ impl ServerStat {
const SCORE_FAIL_WEIGHT: f64 = 3.0;
const SCORE_STDEV_WEIGHT: f64 = 1.0;
// [EPSILON, 1]
// Just for avoiding divide by 0
let user_weight = self.user_weight.max(f32::EPSILON);
// Score = (norm_lat * 1.0 + prop_err * 3.0 + stdev * 1.0) / 5.0 / user_weight
//
// 1. The lower latency, the better
@@ -81,7 +85,7 @@ impl ServerStat {
// 4. The higher user's weight, the better
let score = (nrtt * SCORE_RTT_WEIGHT + self.fail_rate * SCORE_FAIL_WEIGHT + nstdev * SCORE_STDEV_WEIGHT)
/ (SCORE_RTT_WEIGHT + SCORE_FAIL_WEIGHT + SCORE_STDEV_WEIGHT)
/ self.user_weight as f64;
/ user_weight as f64;
// Times 10000 converts to u32, for 0.0001 precision
(score * 10000.0) as u32