[Gbbopen-developer] portable threads on sbcl 64bit linux tests fail with pristine source

[Dan Corkill]

Following up more specifically on your long real-time post...

Antony Sequeira wrote:
> So, I modified the code portable-threads-test.lisp a bit ...
> and I get

> ;; Performing basic thread tests...
> ;;   Timing (sleep 0), run time should be zero seconds... 0.0 seconds
> 0.004 real seconds
> ;;   Timing (sleep 10), run time should also be zero seconds... 0.0
> seconds 10.004 real seconds
> ;;   Timing 100000 (sleep 0)s... 0.0 seconds 400.168 real seconds
> WARNING: 100000 (sleep 0)s took 0.0 seconds
> ;;   Timing 100000 throwable (sleep 0)s... 0.0 seconds 400.159 real seconds
> WARNING: 100000 throwable (sleep 0)s took 0.0 seconds
> ;; Basic thread completed

These real-time values indicate a high cost of calling sleep on SBCL
64-bit linux, which is not good.  I'm very surprised by the huge
difference from SBCL 32-bit linux.  I guess it's time to look again at
the SBCL sources to see what might be going on with SBCL's 64-bit OS
interface code.

What version of SBCL are you using (lisp-implementation-version)?

-- Dan

> P.S.: should I stop cc'ng the mailing list ?

No, please continue to CC the list!



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