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Re: QEMU Automated Testing (was [Qemu-devel] qemu Makefile.target vl.h h

From: Anthony Liguori
Subject: Re: QEMU Automated Testing (was [Qemu-devel] qemu Makefile.target vl.h hw/acpi.c hw/adlib.c ...)
Date: Fri, 27 Jul 2007 12:55:08 -0500
User-agent: Thunderbird (X11/20070604)

Paul Brook wrote:
As Qemu cannot use multicore CPUs (partially due to missing thread
safety), yet, you won't benefit from this unless you want to run
multiple instances of Qemu in parallel.
how close is thread safey?

In a useful form: a fair way off.

It's relatively simple to hack something together than runs. Making it work correctly and go fast is much harder though. My current prototype (running on 2 cores) runs about a quarter the speed of normal qemu, and dies shortly after booting because the guest atomic synchronisation primitives don't work right.

This later problem seems like the hardest to solve to me. Did you have any ideas here that don't involve hand coding the translation for atomic instructions?


Anthony Liguori

Either way, for a tinderbox or automated testing yo *do* have lots of different tests you can run in parallel, so it doesn't matter that each qemu instance only uses one core. We're only talking about small SMP here - maybe 16 cores, but not thousands.


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