Class Data Sharing and Compiler Dependency
coleen.phillimore at oracle.com
Mon Jul 2 08:15:17 PDT 2012
Today CDS (Class Data Sharing) is only supported UseSerialGC, which is
almost never used for the server compiler (COMPILER2). The original
conditional code was intended to do that, then TIERED got added.
In the PermGen elimination work, CDS is supported for all GCs so this
conditional code needs to be cleaned up. Thanks for pointing it out.
On 7/2/2012 3:56 AM, David Holmes wrote:
> On 2/07/2012 4:34 PM, jam tech wrote:
>> i see class data sharing disabled for COMPILER2(in arguments.cpp) .
>> can any
>> one help me knowing why its disabled for COMPILER2 , while its
>> enabled in
>> COMPILER1 , TIERED cases ?
> AFAICS it is only -Xshare:dump that is "disabled"
> This is not an authoritive history but ...
> - CDS was initially only intended for client VM and not supported on
> - early TIERED compilation work enabled CDS
> - hotspot has actually been building TIERED rather the COMPILER2 for a
> while now
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