From df7b3dd861fbb1e3054b6351ffac77361335dee9 Mon Sep 17 00:00:00 2001
From: zzz <zzz@mail.i2p>
Date: Tue, 29 Jun 2010 02:30:40 +0000
Subject: [PATCH] * Scale prng.buffers based on max memory, reduce default
from 16 to 9
---
router/java/src/net/i2p/router/RouterContext.java | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/router/java/src/net/i2p/router/RouterContext.java b/router/java/src/net/i2p/router/RouterContext.java
index b4fa753812..3d5ed609ed 100644
--- a/router/java/src/net/i2p/router/RouterContext.java
+++ b/router/java/src/net/i2p/router/RouterContext.java
@@ -92,8 +92,16 @@ public class RouterContext extends I2PAppContext {
envProps = new Properties();
if (envProps.getProperty("time.disabled") == null)
envProps.setProperty("time.disabled", "false");
- if (envProps.getProperty("prng.buffers") == null)
- envProps.setProperty("prng.buffers", "16");
+ if (envProps.getProperty("prng.buffers") == null) {
+ // How many of these 256 KB buffers do we need?
+ // One clue: prng.bufferFillTime is ~10ms on my system,
+ // and prng.bufferFillTime event count is ~30 per minute,
+ // or about 2 seconds per buffer - so about 200x faster
+ // to fill than to drain - so we don't need too many
+ long maxMemory = Runtime.getRuntime().maxMemory();
+ long buffs = Math.min(16, Math.max(2, maxMemory / (14 * 1024 * 1024)));
+ envProps.setProperty("prng.buffers", "" + buffs);
+ }
return envProps;
}
--
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