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From "Weldon Washburn" <weldon...@gmail.com>
Subject [drlvm][vm] vm_strings.cpp compressing to 8-bit (was "question about support for compressed StringBuffers")
Date Thu, 21 Sep 2006 13:36:09 GMT
  All,
I took a look at this code.  I vote for keeping it.  The reason is because
Java is string intensive and historically things like string compression
make a difference to heap footprint and cache miss performance.   It looks
like a significant amount of work has already been put in this code.

Craig,
It would be great if you can work on this code and get it going.  I would be
happy to work with you to get the mods committed to Harmony svn.




From: *Craig Zilles <zilles@cs.uiuc.edu>*
** Reply-To: *harmony-dev@incubator.apache.org*
To: *harmony-dev@incubator.apache.org*
Date: *Sep 19, 2006 1:24 PM*
Subject: *question about support for compressed StringBuffers*
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       I noticed in the file trunk/vm/vmcore/src/util/vm_strings.cpp there
is some code to support the storage of strings in arrays of (8b)
bytes rather than arrays of (16b) unsigned shorts.  In the debugger,
I placed breakpoints in this code, and it was never active in my run.

       Can someone tell me the current status of this code and, if it is
active, how I can turn it on?  (From inspecting the source, it looked
inactive via hardcoding "false" on whether to compress the strings).
I might be interested in working on this code.


                           - Craig


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      Reply Forward Invite Craig to Gmail
          Ivan Volosyuk    to harmony-dev
 More options   Sep 20 (23 hours ago)
 This is an old code and it is unused for quite some time. Most likely
it is broken.
--

Ivan

On 9/20/06, Craig Zilles <zilles@cs.uiuc.edu> wrote:
>
>         I noticed in the file trunk/vm/vmcore/src/util/vm_strings.cpp
there
> is some code to support the storage of strings in arrays of (8b)
> bytes rather than arrays of (16b) unsigned shorts.  In the debugger,
> I placed breakpoints in this code, and it was never active in my run.
>
>         Can someone tell me the current status of this code and, if it is
> active, how I can turn it on?  (From inspecting the source, it looked
> inactive via hardcoding "false" on whether to compress the strings).
> I might be interested in working on this code.

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      Reply Forward Invite Ivan to chat
         Geir Magnusson Jr.    to harmony-dev
 Hide options   Sep 20 (14 hours ago)   From: *Geir Magnusson Jr. <
geir@pobox.com>* Mailed-By: *incubator.apache.org* Reply-To: *
harmony-dev@incubator.apache.org*
To: *harmony-dev@incubator.apache.org*
Date: *Sep 20, 2006 4:08 PM*
Subject: *Re: question about support for compressed StringBuffers*
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 So do we fix it or scrap it?


geir


-- 
Weldon Washburn
Intel Middleware Products Division

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