Hi Jan, On Monday 12 October 2009, Jan Pečiva wrote: > Just to report some performance results. I was compiling Qt 4.5.2 > (~120MB of sources) and I am attaching the performance results: > > Compilation time: > 26 hours: VirtualBox, sources on shared disk (smb) > 5 hours 36 minutes: VirtualBox, sources on virtual disk (vdi file) > 2 hours 38 minutes: native WinXP, local disk > > hw+sw info: > Core 1 Duo (T2400), no VT in processor, 4GB ram, Ubuntu 8.04 with WinXP > guest and MSVC 2005 compiler
thank you for these values. But I think these values are not comparable. For instance, if you are compiling the Qt sources within a VM then you have assigned less memory to the VM than the available RAM on the host (because the host operating system needs memory as well). More RAM means usually more speed since RAM can be used for disk caching. Furthermore, as your host is a dual core but you didn't enable VT-x (even the Core 1 Duo should have VT-x support), your guest will be slower than the host as multiprocessing with VirtualBox is only possible if VT-x/AMD-V is enabled. To get more comparable values you had to limit the RAM of the host to match the amount of RAM of the guest and you should limit the number of CPU cores of the host to 1 (or enable VT-x if that is possible). Kind regards, Frank -- Dr.-Ing. Frank Mehnert Sitz der Gesellschaft: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht München: HRB 161028 Geschäftsführer: Thomas Schröder, Wolfgang Engels, Wolf Frenkel Vorsitzender des Aufsichtsrates: Martin Häring
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