I had just re-read Mladen's mail and experimented with RANDFILE
myself,
thinking that setting it to /dev/urandom might be the easiest
solution.
I strace'd Tomcat but couldn't find any hint that the value of
RANDFILE
is honored. Since my APR is built to use /dev/urandom I can't be sure,
but if you just restarted Tomcat doing some typing and mouse-moving in
between, the speed increase during startup might just be a result of
/dev/random having gathered enough entropy in the meantime to satisfy
Tomcat's read request without blocking.
RANDFILE is definitely honored and it does work well setting it as /
dev/urandom. I've restarted Tomcat a number of times and it stayed
fast, plus:
cat /proc/sys/kernel/random/entropy_avail
consistently returns low values. Generating activity. In fact, with
hindsight the times that Tomcat took longest to start were the times
I wasn't doing anything else on the server - but the startup time was
always 5 minutes or more and now it starts in under a minute. I'm
only accessing the server via SSH btw - it's actually an Amazon EC2
instance.
Does Tomcat start still fast if you do something like
dd if=/dev/random of=/dev/null bs=1
let that run for a couple of seconds and start Tomcat immediately
after
interrupting it?
Yep, no delays at all.
Adrian Sutton
http://www.symphonious.net
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