Hi all, first time poster here. I'm working on a CLI project called CommandBox ( https://www.ortussolutions.com/products/commandbox ) which is based on a JSR-223 implementation of the JVM language Lucee Server ( http://lucee.org/ ). Lucee uses Apache Felix internally when it starts up and on my Windows machines I'm seeing a significant slowdown in startup time due to accessing my Windows network adapter in order to read the Mac address as part of SecureRandom which is used to generate a UUID for each Felix instance.
By significant slowdown, I'm talking about 1.5 seconds, which may go unnoticed in a server startup, but is a week in CLI-startup years. :) Java libs that want to access my network adapter's Mac address are a common nemesis of my startup times, mostly due to Windows sucking from what I can tell. This line here is where things start to go south: https://github.com/apache/felix/blob/trunk/framework/src/main/java/org/apache/felix/framework/Felix.java#L675 And the stack traces usually look similar to this right here: java.lang.Thread.State: RUNNABLE at java.net.NetworkInterface.getMacAddr0(Native Method) at java.net.NetworkInterface.getHardwareAddress(NetworkInterface.java:460) at sun.security.provider.SeedGenerator.addNetworkAdapterInfo(SeedGenerator.java:238) at sun.security.provider.SeedGenerator.access$000(SeedGenerator.java:80) at sun.security.provider.SeedGenerator$1.run(SeedGenerator.java:183) at sun.security.provider.SeedGenerator$1.run(SeedGenerator.java:168) at java.security.AccessController.doPrivileged(Native Method) at sun.security.provider.SeedGenerator.getSystemEntropy(SeedGenerator.java:168) at sun.security.provider.SecureRandom$SeederHolder.<clinit>(SecureRandom.java:201) at sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:221) - locked <0x00000007415f5f40> (a sun.security.provider.SecureRandom) at java.security.SecureRandom.nextBytes(SecureRandom.java:468) at org.apache.felix.framework.util.Util.randomUUID(Util.java:795) at org.apache.felix.framework.Felix.init(Felix.java:675) at org.apache.felix.framework.Felix.init(Felix.java:626) at org.apache.felix.framework.Felix.start(Felix.java:964) ... unrelated bootstrapping code... Based on the comments and a quick review of the code, I'm guessing the generation of a UUID of some sort is unavoidable. What are the chances of switching to some other, much faster library for UUID generation that doesn't need to drop down the rabbit hole of asking my Windows networking stack for a Mac address? This will make a huge difference in my CLI startup times for sure. Perhaps a library like this could be used: https://github.com/jchambers/fast-uuid Thanks! ~Brad *Developer Advocate* *Ortus Solutions, Corp * E-mail: b...@coldbox.org ColdBox Platform: http://www.coldbox.org Blog: http://www.codersrevolution.com
