How to trim some more fat OpenJDK 8 (original) (raw)

Medi Montaseri medi.montaseri at hds.com
Thu Feb 27 03:22:46 UTC 2014

Hi,

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 269M jvm

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 * 168K bin 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/* 4.0K jre/ASSEMBLY_EXCEPTION 272K jre/bin 97M jre/lib 20K jre/LICENSE 180K jre/THIRD_PARTY_README mmontaseri at griffin:/work/bug-91383/depot2/jvm/openjdk-1.8.0-internal> du -sh lib 38M 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 7u25-2.3.10-1deb7u1 amd64 OpenJDK Development Kit (JDK) ii openjdk-7-jre:amd64 7u25-2.3.10-1deb7u1 amd64 OpenJDK Java runtime, using Hotspot JIT ii openjdk-7-jre-headless:amd64 7u25-2.3.10-1deb7u1 amd64 OpenJDK Java runtime, using Hotspot JIT (headless) ii openjdk-7-jre-lib 7u25-2.3.10-1deb7u1 all OpenJDK Java runtime (architecture independent libraries)

thanks Medi

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