Date: Tue, 30 May 2006 11:07:05 -0400 From: Kurt Miller <kurt@intricatesoftware.com> To: freebsd-java@freebsd.org Cc: Vadim Goncharov <vadimnuclight@tpu.ru> Subject: Re: diablo 1.5 died after 5 day uptime Message-ID: <200605301107.05985.kurt@intricatesoftware.com> In-Reply-To: <ops955inu24fjv08@nuclight.avtf.net> References: <ops931hxox17d6mn@nuclight.avtf.net> <200605261307.06671.kurt@intricatesoftware.com> <ops955inu24fjv08@nuclight.avtf.net>
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On Friday 26 May 2006 1:29 pm, Vadim Goncharov wrote: > 27.05.06 @ 00:07 Kurt Miller wrote: > > >> >> From what I can gather from the stack trace, the jvm was > >> > in the process of a graceful shutdown but there wasn't enough > >> > memory for it to pull it off. There is only so much you can > >> > do to protect against out-of-memory errors when you need more > >> > to report it nicely to the user. > >> > >> Hmm, OK. Is there any way to tell Java that memory is about to end > >> before killing ? Or may be a way to make GC to free some memory > >> periodically? May be outside from java, undocumeted external > >> signaling to diablo-jdk ? At last, does it respect login.conf limits > >> at all, doing graceful shutdown before / trying to raise to hard limit ? > >> > > > > If your goal is to limit the amount of memory the jvm uses, > > I would recommend using the standard command line arguments > > that control the heap size (-Xmx & -Xms) and leave your limits > > How can I check default values of these on my system ? Sorry for the delay - holiday weekend here. IIRC, the values are set by the jvm depending on the amount of physical memory in your system. I don't recall how you find out what they are. > > > high. Note that the jvm uses more memory then is controlled > > by the -Xmx arg. You need to leave some head room for that if > > your going to be setting your limits lower. > > OK, thanx. Is that overhead big? It varies depending on what your application does. Overall, I think you will find there is plenty of information on the web about how to tune memory usage of the jvm. -Kurt
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