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Re: [Libvir] libvirt statistics

Eduardo Habkost wrote:

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

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):

_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 ...


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