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Date: Thu, 29 Nov 2007 15:49:03 +0300
From: Gregory Shimansky <gshimansky@apache.org>
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To: dev@harmony.apache.org
Subject: Re: Problems about the harmony
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Sender: Gregory Shimansky <gshimansky@gmail.com>

Egor Pasko wrote:
> On the 0x39D day of Apache Harmony Yang Paulex wrote:
>>> 3.The most important thing is we can't debug our program, which is a
>>>> magnificent and complex program, although you can debug a small
>>> smoothly.
>>
>> Not sure what VM you were using, but I believe there are many guys here
>> happy to help fixing the problems :).
> 
> probably, Junguo meant that debugging is very slow with DRLVM?
> 
> In fact, DRLVM should be slower when debugging because many tricky
> JIT optimizations are turned off in this mode (for stability reasons).

There were two (two on Linux, one on all platforms) regressions in 
debugging code that could easily deadlock debugged process. These are 
HARMONY-1575 and HARMONY-5213. The 2nd one I fixed just an hour ago.

These two bugs happened after introducing additional synchronization 
(HARMONY-4862, revision 594177) to protect necessary data in 
multithreaded programs and generally improve debugging stability. But 
new synchronization code happened to have bugs and therefore caused 
deadlocks.

Now that known regressions are fixed I hope debugging quality is better 
and I would really like if Junguo tries it again. The revision with both 
bugs fixed is 599381.

-- 
Gregory