Em 23-09-2013 00:45, Bruce Dubbs escreveu: > Walter P. Little wrote: >> I finished an LFS 7.4 install in VMware recently (Ubuntu 12.04 LTS host) >> and was not disappointed with the performance... Binutils clocked in at >> roughly 75 seconds if I recall correctly. However, I'm not in a position >> to build LFS on this host system directly, so I have no basis for >> comparison. The host hardware is a Sandy Bridge era i7 (3.4 GHz) with 32 >> GB of RAM. VM is configured to use 2 of the 4 cores, and has 2 GB of RAM >> allocated to it. > > Thanks for the data. On your host you could time a configure && make of > binutils without installing it to get a rough idea of the base system. > > I did find a paper on line that compared vmware and kvm and showed a > fairly dramatic slowdown for IO on kvm. > >> I'm not hugely surprised that your ramdisk didn't make a noticeable >> difference, as this sort of work seems largely CPU-bound. One thought >> would be to look into adjusting qemu's "nice" value to see if that gets the >> build time closer to that of the native hardware. > > Nice wouldn't do anything since nothing else was running at the time. > I'll note that there is a fair amount of IO in a build since compilers, > linkers, scripts, headers, c code, etc are read a lot and object files > written. An interesting experiment would be to put /tools on a ram disk > and try timing that. On a base LFS system, that's about 725M not stripped. >
Just run the same script for SBU (using binutils-2.23.2): Host : SBU=121s Guest: SBU=180s Guest is VMPlayer, runinng LFS7.4. Host runs LFS7.1. Host gave the same value in two runs. Guest gave 186s and 174s. I chose VMware over VirtualBox, which was faster, (at the time made by Sun), because it could create v-disks separated in 2GB files, easier to backup and transfer. -- []s, Fernando -- http://linuxfromscratch.org/mailman/listinfo/lfs-dev FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
