Author: Tobias Weber <tobias_webe...@gmx.de>
Branch: c8-tcp-style-trx-length
Changeset: r2079:50a4a53200e3
Date: 2017-06-27 15:01 +0200
http://bitbucket.org/pypy/stmgc/changeset/50a4a53200e3/
Log: Improve backoff duration computation
diff --git a/c8/stm/nursery.c b/c8/stm/nursery.c
--- a/c8/stm/nursery.c
+++ b/c8/stm/nursery.c
@@ -34,8 +34,8 @@
} else {
new = STM_MIN_RELATIVE_TRANSACTION_LENGTH;
}
- // the shorter the trx, the more backoff
- tl->transaction_length_backoff = (int)(1 / new);
+ // the shorter the trx, the more backoff: 1000 at min trx length,
proportional decrease to 1 at max trx length (think a/x + b = backoff)
+ tl->transaction_length_backoff = (int)(0.0000001 / new - 0.9999999);
tl->linear_transaction_length_increment = new;
} else if (tl->transaction_length_backoff == 0) {
// backoff counter is zero, exponential increase up to 1
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