use runtime cache line size detection

Modern glibc can easily return the L1 cache line size with
sysconf(3), so we'll use that and avoid paying a size penalty on
CPUs with smaller cache lines than 128 (every modern x86 except
the idiotic P4).

Additionally, if we detect a single CPU machine, avoid paying
any padding penalty at all.

On machines without the non-portable glibc sysconf(3)
enhancements, we'll continue to operate on the assumption
of an enormous 128 byte cache line size.

0 files changed, 0 insertions, 0 deletions