Take three thread dumps 5s apart during the slowness and then diff them
to see what is moving and what is not.
Mark
On 28/09/2022 07:30, Thomas Hoffmann (Speed4Trade GmbH) wrote:
Hello,
could the underlying hardware cause the delay?
Maybe the OS has cached some data and don’t need to read it from disk again?
Maybe you can check the IO and CPU load during startup and compare.
-----Ursprüngliche Nachricht-----
Von: Jerry Malcolm <techst...@malcolms.com>
Gesendet: Mittwoch, 28. September 2022 04:54
An: users@tomcat.apache.org
Betreff: Re: Slow startup first time after reboot
Neil,
Sadly, that line doesn't appear either with or without the java.security.egd
option. That appears to be a lump sum of 4-5 minutes for the
SecureRandom seed thing. I'm getting a total accumulation of ~5
minutes. But it's made up of a bunch of ~15-sec web starts. See example
below. Same two lines from Catalina.out from the first boot and a second
boot.
One other clue I've noted. The quick boot occurs on an immediate
stop/start. I have noticed a couple of times in Eclipse that if I stop TC and
leave it stopped for a while, it goes back to the long startup. It sounds like
something related to loading modules/jarFiles. On an immediate restart the
JVM wouldn't have time to unload modules before they are needed
again. But a new loading of some module on each web app might be what's
killing it (??)
JVM Version: 11.0.16+8-LTS
JVM Vendor: Red Hat, Inc.
Auto-startup of TC on EC2 startup:
28-Sep-2022 00:15:55.612 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment
of web application directory
[/var/domains/wridz.com/webapps/idmanager] has finished in [16,991] ms
[1 example... ~20 more like it]
28-Sep-2022 00:18:40.818 INFO [main]
org.apache.catalina.startup.Catalina.start Server startup in [306666]
milliseconds
Reboot of TC
28-Sep-2022 02:28:45.854 INFO [main]
org.apache.catalina.startup.HostConfig.deployDirectory Deployment
of web application directory
[/var/domains/wridz.com/webapps/idmanager] has finished in [737] ms [1
example... ~20 more like it]
28-Sep-2022 02:28:51.476 INFO [main]
org.apache.catalina.startup.Catalina.start Server startup in [19795]
milliseconds
On 9/27/2022 8:32 PM, Neil Aggarwal wrote:
Are there perhaps
some log levels I could change that would provide more detailed
information about what step it's hung up on for loading these web apps?
I just tested this on a dev sever.
I removed the java.security.egd option and rebooted my server.
Once I waited for Tomcat to finish starting up, catalina.out had this line:
WARNING [main]
org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom
Creation of SecureRandom instance for session ID generation using
[SHA1PRNG] took [222,741] milliseconds.
Check if your log has something similar.
Thank you,
Neil
--
Neil Aggarwal, (972) 834-1565, http://www.propfinancing.com We offer
30 year loans on single family houses!
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