How to trim some more fat OpenJDK 8
medi.montaseri at hds.com
Wed Feb 26 18:33:11 PST 2014
I am building OpenJDK 8 for a tight environment and would like to have a very small JDK (or I should say JRE) footprint....sort of like headless but even more.
I would like to do this from the configure(1) as much as possible. And then resort to rm(1).
Here is build result on amd64 Debian 7.3 without any trimming
mmontaseri at griffin:~/work/bug-91383/openjdk8> du -sh *
168K bin # these are all symlinks to jvm/bin
too much...I need to get down to under 30 Meg. So I build again with
configure --disable-headful --disable-debug-symbols --disable-zip-debug-info
and I get the following result
mmontaseri at griffin:~/work/bug-91383/depot2> du -sh *
168M jvm # went down from 296M to 168M
That is good, but not good enough....I then looked around and found about 66 Meg of *.diz files. We don't need these.
Q1- is there any configure option to not produce *.diz files (gdb debug info for .so files). If not, then I have to rm(1) them.
Q2- I see two lib directories under jvm/openjdk-1.8.0-internal
mmontaseri at griffin:~/work/bug-91383/depot2/jvm/openjdk-1.8.0-internal> du -sh jre/*
mmontaseri at griffin:~/work/bug-91383/depot2/jvm/openjdk-1.8.0-internal> du -sh lib
Can you help me understand the difference between lib/* and jre/lib
I see debian has created a set of packages on OpenJDK 7, like so
ii openjdk-7-jdk:amd64 7u25-2.3.10-1~deb7u1 amd64 OpenJDK Development Kit (JDK)
ii openjdk-7-jre:amd64 7u25-2.3.10-1~deb7u1 amd64 OpenJDK Java runtime, using Hotspot JIT
ii openjdk-7-jre-headless:amd64 7u25-2.3.10-1~deb7u1 amd64 OpenJDK Java runtime, using Hotspot JIT (headless)
ii openjdk-7-jre-lib 7u25-2.3.10-1~deb7u1 all OpenJDK Java runtime (architecture independent libraries)
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