From 222abb5be29a95538f37ed28760df68b037b2a52 Mon Sep 17 00:00:00 2001
From: David Shah <davey1576@gmail.com>
Date: Sun, 9 Dec 2018 14:41:02 +0000
Subject: placer1: Encourage chain swaps
Signed-off-by: David Shah <davey1576@gmail.com>
---
common/placer1.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/common/placer1.cc b/common/placer1.cc
index db10b7d3..ecb61b5c 100644
--- a/common/placer1.cc
+++ b/common/placer1.cc
@@ -553,7 +553,7 @@ class SAPlacer
(1 - lambda) * (double(moveChange.wirelen_delta) / last_wirelen_cost);
n_move++;
// SA acceptance criterea
- if (delta < 0 || (temp > 1e-8 && (ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / temp))) {
+ if (delta < 0 || (temp > 1e-9 && (ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / (5 * temp)))) {
n_accept++;
if (ctx->debug)
log_info("accepted chain swap %s\n", cell->name.c_str(ctx));
--
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