On Sunday 05 April 2009 01:35:18 Izik Eidus wrote: > This driver is very useful for KVM as in cases of runing multiple guests > operation system of the same type. > (For desktop work loads we have achived more than x2 memory overcommit > (more like x3)) Interesting that it is a desirable workload to have multiple guests each running MS office. I wonder, can windows enter a paravirtualised guest mode for KVM? And can you detect page allocation/freeing events? > This driver have found users other than KVM, for example CERN, > Fons Rademakers: > "on many-core machines we run one large detector simulation program per core. > These simulation programs are identical but run each in their own process and > need about 2 - 2.5 GB RAM. > We typically buy machines with 2GB RAM per core and so have a problem to run > one of these programs per core. > Of the 2 - 2.5 GB about 700MB is identical data in the form of magnetic field > maps, detector geometry, etc. > Currently people have been trying to start one program, initialize the geometry > and field maps and then fork it N times, to have the data shared. > With KSM this would be done automatically by the system so it sounded extremely > attractive when Andrea presented it." They should use a shared memory segment, or MAP_ANONYMOUS|MAP_SHARED etc. Presumably they will probably want to control it to interleave it over all numa nodes and use hugepages for it. It would be very little work. > I am sending another seires of patchs for kvm kernel and kvm-userspace > that would allow users of kvm to test ksm with it. > The kvm patchs would apply to Avi git tree. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
