Ali Nazemian wrote: > Hi every body, > Any body knows that what happened to C-Sharifi project that announce 1 > year ago?! that was about implementing clustering management in kernel... > Cheers. I don't know about that particular project but I do know something about implementing clustering in the kernel (from RHEL4 cman) and generally it's a waste of time and energy. The cluster manager is not performance-critical enough and too complex to do sensibly in the kernel. Having all the infrastructure in the kernel simply makes developing and testing much much harder for no real gain. The performance-critical components (eg lock manager and filesystem) can still be in the kernel and leave the cluster manager in userspace where it can be easily managed and reconfigured - have you ever tried to get an XML parser into the kernel? No, me neither and I don't want to try ;-) About the only thing that a kernel-based cluster manager gains you is freedom from memory inversion problems in low memory situations as you can guarantee it is always in physical RAM, but even that isn't total as you still have to rely on the networking layers. And there are ways of locking userland process into memory anyway. They're not quite as effective as having it kernel-based but those aren't perfect either! Just my ha-penny's worth ... Chrissie -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
