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Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
27f2edf96c
With the vast number of log debug statements in the code, the logging framework has a measurable performance impact on libvirt code, particularly in the daemon event loop. The global log buffer records every single log message triggered whether anyone cares to see them or not. This makes it impossible to eliminate the overhead of printf format expansions in any of the logging code. It is possible to disable the global log buffer in libvirtd itself, but this doesn't help client side library code. Also even if disabled by the config file, the existence of the feature makes other performance improvements in the logging layer impossible. Instead of logging every single message to the global buffer, only log messages that pass the log filters. This if libvirtd is set to have log_filters="1:libvirt 1:qemu" the global log buffer will only get filled with those messages instead of everything. This reduces the performance burden, as well as improving the signal to noise ratio of the log buffer. As a quick benchmark, a demo program that registers 500 file descriptors with the event loop (eg equiv of 500 QEMU monitor commands), creates pending read I/O on every FD, and then runs virEventRunDefaultImpl() took 1 minute 40 seconds to do 51200 iterations with nearly all the time shown against the logging code. After this optimization it only takes 4.6 seconds. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> |
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| daemon | ||
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| examples | ||
| gnulib | ||
| include | ||
| m4 | ||
| po | ||
| src | ||
| tests | ||
| tools | ||
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| .mailmap | ||
| AUTHORS.in | ||
| autobuild.sh | ||
| autogen.sh | ||
| bootstrap | ||
| bootstrap.conf | ||
| cfg.mk | ||
| ChangeLog-old | ||
| config-post.h | ||
| configure.ac | ||
| COPYING | ||
| COPYING.LESSER | ||
| HACKING | ||
| libvirt.pc.in | ||
| libvirt.spec.in | ||
| Makefile.am | ||
| Makefile.nonreentrant | ||
| mingw-libvirt.spec.in | ||
| README | ||
| README-hacking | ||
| run.in | ||
| TODO | ||
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>