[jboss-dev] Small boottime improvement

[Kabir Khan]

I found that ScopeKey's hashCode was not being calculated correctly (http://community.jboss.org/message/526058#526058), and fixed this in a local jboss-mdr snapshot, which gives another tiny enhancement. Here are today's numbers, same setup as last time.

kernel 2.2.0-Alpha5
mdr 2.2.0-Alpha1
===============
34s:696ms (1)
20s:562ms (2)
20s:349ms (7)
20s:463ms (10)
20s:622ms (13)
20s:582ms (16)
20s:35ms (19)
-------------------------
Average ignoring (1): 20s436ms

kernel 2.2.0-SNAPSHOT
mdr 2.2.0-Alpha1
===================
29s:637ms (3)
19s:627ms (4)
19s:786ms (8)
20s:2ms (11)
20s:432ms (14)
19s:827ms (17)
19s:731ms (20)
-------------------------------
Average ignoring (3): 19s900ms

kernel 2.2.0-SNAPSHOT
mdr 2.2.0-SNAPSHOT
============================
27s:167ms (5)
19s:834ms (6)
19s:702ms (9)
19s:349ms (12)
20s:228ms (15)
19s:346ms (18)
19s:315ms (21)
----------------------------
Average ignoring (5): 19s629ms

Now that I'm more into profiling stuff, I'll see if profiling minimal as suggested by Bill makes more sense to me, if not I'll do a few more cycles of these.


On 11 Feb 2010, at 12:25, Kabir Khan wrote:

> 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
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