Fwd: Re: How to decrease size of j2sdk_image

[Daniel D. Daugherty]

On 10/11/12 8:50 AM, matchew wrote:
> what about openjdk builds used for example by ubuntu package manager 
> (default repos)? these builds do not have these debug files (*.diz) at 
> all.

I don't know how Ubuntu builds the OpenJDK repos so I can't
really comment on why those builds don't have debug info files.
Downstream projects can change the default settings and several
of the downstream Linux project have enabled even more debug
info in their builds.


> If i am not considering jvm/jdk native code debugging is it safe to 
> just remove them all?

It's your build. If you don't think you need the debug info, then
you can remove it.

Dan


>
> 2012/10/11 Daniel D. Daugherty <daniel.daugherty at oracle.com 
> <mailto:daniel.daugherty at oracle.com>>
>
>     On 10/11/12 3:21 AM, Seán Coffey wrote:
>>     Moving this off discuss mailing list to build-dev.
>>
>>     Why is ENABLE_FULL_DEBUG_SYMBOLS being set to 1 for many product
>>     builds now ? It slows down the build and creates increased bundle
>>     size even though the majority of users do not require this
>>     functionality.
>
>     The Full Debug Symbols feature will eventually be enabled for all
>     OSes for which Oracle generates bits. I think MacOS X is the last
>     platform and that work is tracked by:
>
>         7165611 3/3 implement Full Debug Symbols on MacOS X
>
>     The default setting for ENABLE_FULL_DEBUG_SYMBOLS is "1" (enabled)
>     because the Full Debug Symbols feature is intentionally enabled in
>     all promoted bits for diagnosibility and debuggability. If FDS is
>     not enabled when the promoted bits are built, then the debug info
>     generated by a rebuild of *exactly the same source* with FDS enabled
>     cannot be (reliably) used with the promoted bits.
>
>     You might be saying:
>
>         That's fine for promoted bits, but what about the rest of us?
>
>     The answer there is actually simple. We want our developer private
>     builds and automated system builds, e.g., JPRT, to match what Release
>     Engineering builds. We don't want RE to be surprised by an integration
>     that builds fine when FDS is disabled only to blow up when FDS is
>     enabled.
>
>     Similarly, we also don't want SQE/SQA to be surprised by different
>     test results with bits built by RE versus bits built with FDS
>     disabled,
>     e.g., JPRT. Enabling "debug info" in a build changes the compiler
>     optimizations and that changes the bits in the binary. Those changes
>     in the binary might mask a bug that only shows up after RE has built
>     with FDS enabled. Conversely, if you disable FDS in your private
>     build,
>     you might end up chasing a bug that only reproduces in your private
>     build and doesn't reproduce in an FDS enabled build.
>
>
>>     Could we consider flipping the default for
>>     ENABLE_FULL_DEBUG_SYMBOLS to 0 ? (like I've done for all my build
>>     scripts?)
>
>     For the reasons I stated above, no we won't change the default for
>     ENABLE_FULL_DEBUG_SYMBOLS to "0" (disabled) unless Oracle changes
>     the way that promoted bits are built.
>
>     You are welcome to disable the feature in your private builds which
>     is why I added the ENABLE_FULL_DEBUG_SYMBOLS flag. However, please
>     remember that any testing that you do with those bits won't
>     necessarily
>     match testing done with the official promoted bits.
>
>     Dan
>
>
>>
>>     regards,
>>     Sean.
>>
>>     -------- Original Message --------
>>     Subject: 	Re: How to decrease size of j2sdk_image
>>     Date: 	Thu, 11 Oct 2012 14:57:46 +0800
>>     From: 	Weijun Wang <weijun.wang at oracle.com>
>>     <mailto:weijun.wang at oracle.com>
>>     To: 	discuss at openjdk.java.net <mailto:discuss at openjdk.java.net>
>>
>>
>>
>>     You can try set ENABLE_FULL_DEBUG_SYMBOLS to 0.
>>
>>     -Max
>>
>>     On 10/11/2012 02:38 PM, matchew wrote:
>>     >
>>     >  After successful openJDK7 build (Ubuntu 12.04) i have found that
>>     >  'j2sdk-image' has 240MB. More than 100MB belongs to one directory:
>>     >  openjdk7/jre/lib/amd64
>>     >
>>     >  Can anyone explain me why it is so big? For example in openJDK7 installed
>>     >  via package manager this folder has only 18MB
>>     >
>>     >  Is there any way to decrease its size?
>>     >
>>     >  Thanks in advance
>>     >  --
>>     >  Mateusz
>>     >
>>
>>
>>
>