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From: j4n bur53 <janburse@fastmail.fm>
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Subject: Re: The code being executed before hitting main() method
Date: Wed, 14 Oct 2015 19:08:16 +0200
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John schrieb:
> This web page helps a lot:
> https://wiki.csiro.au/pages/viewpage.action?pageId=545042739
>

The below article(*) somehow suggests that:
-XX:+UseSerialGC

And the following:
-XX:ParallelGCThreads=1 -XX:+UseParallelGC

Are the same.
Which seems not to be 100% true, I get:

java -XX:+PrintFlagsFinal -version | grep GC
uintx ParallelGCThreads                         = 4

java -XX:+UseSerialGC -XX:+PrintFlagsFinal -version | grep GC
uintx ParallelGCThreads                         = 0

(*)
http://blog.chrysocome.net/2013/05/what-happened-to-java-client.html