Re: [Libvir] libvirt statistics
Eduardo Habkost wrote:
Hi,
On Thu, Sep 06, 2007 at 02:10:39PM +0100, Richard W.M. Jones wrote:
> [Using `pahole' and friends - see
> http://git.kernel.org/?p=linux/kernel/git/acme/pahole.git;a=summary and
> https://ols2006.108.redhat.com/2007/Reprints/melo-Reprint.pdf ]
>
> These are all on x86-64. You'll get slightly different results on a 32
> bit arch.
>
> Largest structures, by size:
>
> qemud_vm_def: 16608 4
> qemud_vm_os_def: 16436 1
> _testConn: 14504 2
<snip>
What is the second field here?
Good question! I had to look at the source code and it turns out the
the second numeric field is the number of holes.
> Structures with holes which could be made smaller by packaging
(third
> number is how many bytes you'd save per allocation):
>
<snip>
> _xmlValidCtxt 112 104 8
> _xmlEntity 136 128 8
> _xmlParserCtxt 696 672 24
> _testConn 14504 14496 8
> _xmlURI 80 72 8
> _xmlXPathObject 72 56 16
> _xmlXPathParserContext 80 72 8
> _xmlXPathContext 352 336 16
> _xmlError 88 80 8
> _xmlAttr 96 88 8
> _xmlDoc 168 160 8
> _xmlNode 120 112 8
Are those defined by libxml, or are they from the libvirt code?
They're in libxml2. The way that the dwarves programs work is they
consider the whole program or shared library, everything it contains and
all dependent libraries down to libc.
> enum /**/ virDrvOpenRemoteFlags; /* 0 */
I think this was supposed to be a type definition. The variable is
never used.
Yes, it's a bug! Patch coming up ...
Rich.
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