[jboss-dev] Small boottime improvement

[Kabir Khan]

I have been doing some work on profiling and optimizing the jboss-dependency project [1] for kernel 2.2.0.Alpha6 and it seems to have had a small, but still measurable impact :-)

I did a few startups of AS with jboss kernel 2.2.0.Alpha5 and with a local snapshot. This snapshot contains the work done for Alpha6 with the addition of removing the break in the resolveContexts loop as mentioned in the forum thread.

The startups were done on a freshly rebooted machine with nothing else running. The startup orders are given in brackets, so I started Alpha5 twice, then SNAPSHOT twice and so on.

2.2.0-Alpha5
----------------------
37s:247ms (1)
20s:573ms (2)
20s:275ms (5)
20s:127ms (7)
20s:433ms (9)
20s:329ms (10)
20s:890ms (13)


2.2.0-SNAPSHOT
------------------------
29s:563ms (3)
19s:965ms (4)
19s:821ms (6)
20s:332ms (8)
19s:618ms (10)
19s:905ms (12)
19s:900ms (14)

One strange thing is that the first time I started each server they took loads longer than the other times, does somebody know the reason for that? 

Ignoring those initial times leaves me with average start times of:
Alpha5: 20s437ms
SNAPSHOT: 19s923ms

I'm going to have a final look at jboss-dependency to see if there are any other obvious and easy fixes before moving on to have a look at jboss-kernel.

[1] http://community.jboss.org/message/525047#525047