On 2009-03-12, Michael Schnell <[email protected]> wrote:
>
>> it doesn't even have NPTL support. That means that scheduling
>> of threads is being done by user-space code.
> I suppose that you are wrong with that conclusion.
Could be. I'm not sure which posix implementation is used on
the NIOS. Some implementations did do everything in
user-space, and I thought I read that the NIOS port used one of
those.
> If the thread scheduling in fact would be done completely in
> user-space it would be _really_ fast, as the OS would not be
> involved.
I don't follow that argument, but it's a moot point if NIOS is
using LinuxThreads.
> But on the contrary with "Linux Treads", each thread is a
> complete process and inter-thread communication is not better
> than inter-process communication (e.g. due to lack of TLS and
> FUTEX).
Agreed. I was thinking for some reason that on NIOS the
pre-LinuxThreads library was being used. If NIOS is using
LinuxThreads, then something other than user-space scheduling
is the source of the large latencies.
> But happily it seems that NIOS uCLinux will get MMU support
> quite soon
For large enough values of "quite soon". :/
IIRC, the MMU support has been coming "soon" for almost two
years. I started working with NIOS about 4-5 years ago, and
have had to completely recalibrate what "soon" means when
Altera is involved. I've also had do develop new definitions
for what "working" and "usable" mean.
> and we will be able to take advantage from these goodies :).
Good luck.
> I did not take any look into that but as the Microblaze can be
> compiled with an MMU even longer than the NIOS, maybe it's
> Linux can already do all that.
--
Grant Edwards grante Yow! Now I'm concentrating
at on a specific tank battle
visi.com toward the end of World
War II!
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