Date: Tue, 11 Jan 2000 13:25:56 +0100
From: Jonathan Whitehead <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
Organization: Sema Group sae
To: [EMAIL PROTECTED]
Subject: Re: InstantDB deadlock when using multiple clients
This problem with InstantDB which I reported on 17th November 1999
appears to be improved in Jonas 1.6. At least the client never hangs
indefinitely. However the response time is a bit unstable. Reading a
small ( < 20 bytes) record starts off taking 500ms, then seems to get
worse after 100 reads or so. Eventually after a few hundred reads the
JVM running Jonas/InstantDB runs out of virtual memory (using the
default maximum of 16M)
>From the release notes of Jonas 1.6:
"The management of the JDBC connection pool has been improved, thanks to
a contribution of Markus Fritz:
- connection pooling made thread safe
- a "max age" is introduced for connections
- the connection pooling has been improved"
> Asunto: InstantDB deadlock when using multiple clients
> Fecha: Wed, 17 Nov 1999 10:27:06 +0100
>
> I've got a client thread which does the following (simplified):
>
> <code fragment removed>
>
> This works fine when there's just one client thread, but when there are
> 2 threads, sooner or later (usually sooner) we reach a deadlock
> situation where both threads are waiting for a table lock to be released
> in the InstantDB database.
>
--
Jonathan Whitehead
Sema Group sae
[EMAIL PROTECTED]
(34) 91 440 8800 ext 7576
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