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Re: Using threads on OpenVZ, and memory allocation versus memory usage [message #12923 is a reply to message #12655]

Tue, 15 May 2007 07:41

MvdS
Messages: 2
Registered: May 2007

Junior Member

I have had no time yet to show the changes in the memmory map on an OpenVZ machine. But I found one thing that helps, limiting the stack size with ulimit:

ulimit -s 16

Significantly reduces the stack used by every thread, and thus the amount of memory allocated. However I have no idea what is a good amount of stack to use. I suppose this differs with programs.

The quick fix (while waiting for the RSS limiting) would be to mention the usage of threads and ulimit in the documentation of privvmpages usage.

pthreads allows to set the stack size, but it defaults to the maximum allowed by ulimit.

The mappings are really straight forward (4K + around 8MiB per thread). If you still want this info, I'll probably be able to mesure it sometime this week.

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[Message index]

		Using threads on OpenVZ, and memory allocation versus memory usage By: MvdS on Sun, 06 May 2007 14:07
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: xemul on Mon, 07 May 2007 08:44
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: hvdkamer on Wed, 09 May 2007 10:47
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: xemul on Thu, 10 May 2007 07:53
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: hvdkamer on Thu, 10 May 2007 08:19
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: xemul on Thu, 10 May 2007 09:11
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: hvdkamer on Thu, 10 May 2007 09:44
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: MvdS on Tue, 15 May 2007 07:41
		Re: Using threads on OpenVZ, and memory allocation versus memory usage By: xemul on Mon, 21 May 2007 13:25

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