From mboxrd@z Thu Jan 1 00:00:00 1970 To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> In-reply-to: Your message of "Fri, 08 Jan 2010 14:12:39 EST." <8d4a75e55fc55419d48a3859337bc7da@plan9.bell-labs.com> References: <8d4a75e55fc55419d48a3859337bc7da@plan9.bell-labs.com> From: Bakul Shah Date: Fri, 8 Jan 2010 11:42:44 -0800 Message-Id: <20100108194244.9FD7A5B04@mail.bitblocks.com> Subject: Re: [9fans] parallels Topicbox-Message-UUID: ba472d34-ead5-11e9-9d60-3106f5b1d025 On Fri, 08 Jan 2010 14:12:39 EST geoff@plan9.bell-labs.com wrote: > I don't have enough experience with VirtualBox to make a sensible > comparison. Plan9 on virtualBox is unusably slow. > The thing that none of the VM monitors seem to offer (though I'd love > to be proven wrong) is debugging tools for the guest operating > systems. This is odd, as it was one of the major uses of VM/370. So > if a guest kernel goes off into space, the VM monitor shuts down the > virtual machine or resets it, but provides no means to find out what > happened, though it's in a perfect position to easily do so. I have used qemu + host gdb to debug a guest FreeBSD kernel. FreeBSD does have remote gdb support.