POSIX performance

[Till Straumann]

Alexander I. Shaykhrazeev wrote:

> Did somebody check performance of POSIX semaphores and other functions 
> against RTEMS own?
>

A while ago I compared vxworks, rtems and RT-linux regarding
interrupt and thread dispatching latency.
Both, rtems native and posix APIs were used.

See

http://www.slac.stanford.edu/econf/C011127/WEBI001.shtml

Note, however, that the paper incorrectly reports poor pthread
performance under RTEMS. This was due to a programming error
(incorrect task priority assignment). A repeated test using with
the correct pthread priority yielded no significant difference in
performance between RTEMS native and pthreads (for the
latency benchmark - this was not a comprehensive comparison
of all features or primitives, however).

-- Till