Hi,
I was modifying templates and found a way to keep using embedded
tomcat while being able to easily modify the templates (since then I
tried using templates outside of classpath[1]) :
gradle unzipWAR && java -cp
"build/app:build/app/WEB-INF/classes:build/app/WEB-INF/lib/*"
org.springframework.boot.loader.WarLauncher
I wondered why it was much faster to start... So I tested various
possibilities.
(NB: I often enable jdwp by default just in case it can be useful to
see things with a debugger)
Below are some quite astonishing results...
elapsed CPU
WarLauncher on exploded WAR 18 s 25 s
WarLauncher on exploded WAR + jdwp 18 s 26 s
java -jar cas.war 37 s 47 s
java -jar cas.war + jdwp 96 s 109 s
tomcat (exploded ou war) 33 s 43 s
tomcat + jdwp 36 s 46 s
OVERHEADS:
java -jar cas.war 106 % 88 %
tomcat 83 % 72 %
jdwp (for WarLauncher on exploded WAR) 0 % 4 %
jdwp (for java -jar cas.war) 159 % 132 %
jdwp (for tomcat) 9 % 7 %
tested with
- AdoptOpenJDK 15.0.2+7 (also tested debian openjdk 11.0.6+10-1~bpo9+1
with only minor changes)
- CAS 6.4.2 with various modules
- tomcat 9.0.54
- somewhat old OS : debian 9 on VMware
details:
- WarLauncher on exploded WAR = java -cp
"build/app:build/app/WEB-INF/classes:build/app/WEB-INF/lib/*"
org.springframework.boot.loader.WarLauncher
- CPU = "TIME" column of ps (ie "accumulated cpu time, user + system")
- elapsed = time it takes to reach CAS "Ready to process requests"
Liens:
------
[1] https://fawnoos.com/2021/02/16/cas63-ui-themes/
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