Orion Poplawski wrote:
Andrew Haley wrote:
Orion Poplawski wrote:
-rw-r--r-- 1 root root 54M 2008-09-08 13:39
./java-1.6.0-openjdk-1.6.0.0/jre/lib/rt.jar
-rw-r--r-- 1 root root 24M 2008-10-21 15:40
./java-1.6.0-sun-1.6.0.10/jre/lib/rt.jar
Why so much bigger?
I'd open them up and diff the trees.
Andrew.
I think it's compression level. Here are the uncompressed sizes:
167480 rt-sun
171788 rt-openjdk
[root@cynosure rt-sun]# dus
16 META-INF
48 sunw
7060 org
22396 java
30156 javax
38972 sun
68824 com
[root@cynosure rt-openjdk]# dus
16 META-INF
48 sunw
1336 net
7148 org
23576 java
31792 javax
39652 sun
68212 com
If I repack rt-openjdk: zip -r rt-openjdk.zip rt-openjdk
27M 2008-11-21 11:55 rt-openjdk.zip
So, we're packing jars with minimal compression? No,
/usr/lib/rpm/redhat/brp-java-repack-jars uses zip -9 and
java-1.6.0-openjdk turns off __jar_repack.
So, something in the openjdk build does it...
Looks like it's built with:
if ! test -d /builddir/build/BUILD/icedtea6-1.4/bootstrap/jdk1.6.0 ; \
then \
/usr/lib/jvm/java-openjdk/bin/jar cf
bootstrap/jdk1.7.0/jre/lib/rt-closed.jar -C lib/rt com -C lib/rt java \
-C lib/rt javax -C lib/rt netscape -C lib/rt net -C lib/rt sun ; \
else \
/builddir/build/BUILD/icedtea6-1.4/bootstrap/jdk1.6.0/bin/jar cf
bootstrap/jdk1.7.0/jre/lib/rt-closed.jar -C lib/rt com -C lib/rt java \
-C lib/rt javax -C lib/rt netscape -C lib/rt net -C lib/rt sun ; \
fi
So, does the "jar" command use compression?
That's not building the final rt.jar. That's just the faked binary
plugs (which we don't actually need any more btw...)
The IcedTea build is basically done in two stages: an autoconf/automake
IcedTea part which sets up the environment and then fires a second stage
which runs the underlying OpenJDK makefiles. For bootstrap builds, the
OpenJDK make is run twice, the second time with the results of the first
build as the build JDK. rt.jar is built as part of Sun's OpenJDK make
process. The offending line is:
/builder/builds/icedtea/bootstrap/jdk1.6.0/bin/jar c0mf
/builder/builds/icedtea/openjdk-ecj/build/linux-amd64/tmp/manifest.tmp
/builder/builds/icedtea/openjdk-ecj/build/linux-amd64/tmp/rt-orig.jar \
`/bin/cat
/builder/builds/icedtea/openjdk-ecj/build/linux-amd64/tmp/jarfilelists/rt_jar_list`)
I have no idea why 0 is being used to suppress compression, given this
is presumably the same build process Sun uses for the proprietary JDK.
I'll take a look.
--
Andrew :)
--
fedora-devel-java-list mailing list
fedora-devel-java-list@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-devel-java-list
