Talk:Virtualization - Revision history

111.92.5.236: Comment provided by Antony John - via ArticleComments extension

2010-06-15T18:12:20Z

Comment provided by Antony John - via ArticleComments extension

←Older revision		Revision as of 18:12, 15 June 2010
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	--[[User:JaroslavTulach\|JaroslavTulach]] 11:11, 15 June 2010 (UTC)		--[[User:JaroslavTulach\|JaroslavTulach]] 11:11, 15 June 2010 (UTC)

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		+	== Antony John said ... ==
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		+	<div class='commentBlock'>
		+	I faced the same problem with OpenJdk 1.6 in 10.4 Ubuntu and reverted to sun jdk 1.6.. and reduced the default heap allocations.. My machine even after having 2 GB of memory + flash based parallel swap went into grinding halts.. I think any app using more than 64 MB on startup is bloat-ware... Thanks Nathan for pointing out.. By the way I switched to Netbeans and they have this wonderful activation on demand mechanism for plugins that helps to manage memory more efficiently..
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		+	--Antony John 20:12, 15 June 2010 (CEST)
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JaroslavTulach at 11:11, 15 June 2010

2010-06-15T11:11:49Z

←Older revision		Revision as of 11:11, 15 June 2010
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	--Onno Molenkamp 18:07, 14 June 2010 (CEST)		--Onno Molenkamp 18:07, 14 June 2010 (CEST)
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		+	Well, that was my assumption as well. But for some reason it is not true. Starting many (maybe only [[Java]]) processes with huge VIRT size, just kills the system, forcing it to use huge amount of swap.
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		+	--[[User:JaroslavTulach\|JaroslavTulach]] 11:11, 15 June 2010 (UTC)
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	== Nathan said ... ==		== Nathan said ... ==
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	--[http://nathan.crause.name Nathan] 02:26, 15 June 2010 (CEST)		--[http://nathan.crause.name Nathan] 02:26, 15 June 2010 (CEST)
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		+	I'll do my best to make sure this testimony is seen by [[OpenJDK]] guys.
		+	--[[User:JaroslavTulach\|JaroslavTulach]] 11:11, 15 June 2010 (UTC)
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	== Daniel said ... ==		== Daniel said ... ==
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	--Daniel 09:20, 15 June 2010 (CEST)		--Daniel 09:20, 15 June 2010 (CEST)
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		+	'''256MB'''!? Hopefully they at least check whether the system has 256MB of real memory! If not, I at least know where to report a bug.
		+	--[[User:JaroslavTulach\|JaroslavTulach]] 11:11, 15 June 2010 (UTC)
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80.108.42.222: Comment provided by Daniel - via ArticleComments extension

2010-06-15T07:20:13Z

Comment provided by Daniel - via ArticleComments extension

←Older revision		Revision as of 07:20, 15 June 2010
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	--[http://nathan.crause.name Nathan] 02:26, 15 June 2010 (CEST)		--[http://nathan.crause.name Nathan] 02:26, 15 June 2010 (CEST)
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		+	== Daniel said ... ==
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		+	<div class='commentBlock'>
		+	I agree that 512m is much too high for most Java applications. A recent version of Sun JDK bumped the default heap size to 256 MB, though, so if you're concerned about resources, I'd strongly recommend to find a way for setting the maximum heap and permgen size in Hudson (I guess it'd be fine with 64 MB too).
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		+	--Daniel 09:20, 15 June 2010 (CEST)
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99.199.159.82: Comment provided by Nathan - via ArticleComments extension

2010-06-15T00:26:27Z

Comment provided by Nathan - via ArticleComments extension

←Older revision		Revision as of 00:26, 15 June 2010
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	--Onno Molenkamp 18:07, 14 June 2010 (CEST)		--Onno Molenkamp 18:07, 14 June 2010 (CEST)
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		+	== Nathan said ... ==
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		+	<div class='commentBlock'>
		+	This isn't just a virtualization issue - I upgraded my PC to Ubuntu 10.04 which uninstalled the Sun JDK and installed OpenJDK. Any development work I did in Netbeans which launched Glassfish completely crippled my machine. After removing OpenJDK and re-installing the Sun JDK, all was well again. This on a straight Linux machine, no virtualized anything. Given this, I cannot honestly recommend OpenJDK for any purpose what-so-ever.
		+
		+	Added on top of this is that the OpenJDK applet plugin doesn't support the Java console, so debugging applets is infeasible (there's a work-around to launch FireFox from a console, but that's not helpful when trying to debug for an end-user).
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		+	--[http://nathan.crause.name Nathan] 02:26, 15 June 2010 (CEST)
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80.101.104.7: Comment provided by Onno Molenkamp - via ArticleComments extension

2010-06-14T16:07:24Z

Comment provided by Onno Molenkamp - via ArticleComments extension

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<noinclude>Comments on [[Virtualization]]
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== Onno Molenkamp said ... ==

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The VIRT column doesn't say much about the amount of memory used. This can be easily seen by comparing the total amounts of memory used in both cases: they're more or less the same, even though the VIRT value for the java process is very different.

--Onno Molenkamp 18:07, 14 June 2010 (CEST)
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