On Sat, 21 Sep 2013 12:53:36 -0700 Adrian Chadd <[email protected]> wrote:
> .. just as a data point - there was a thread a while ago about numeric > processing performance on linux vs bsd. > > It all boiled down to how jemalloc versus the linux allocator(s) allocate > blocks. jemalloc will page align things after a certain size. Linux didn't. > So when doing numeric processing, there was a lot of cache aliasing going > on leading to inefficient cache usage and redundant memory operations. > > When the same workload on Linux was run on FreeBSD but with the Linux > library/allocators, the performance was identical. > > No-one followed through. I think I may have to write a blog post about it. There's no MALLOC_OPTIONS flag to set/unset this, but adding a new flag to disable a feature is easier (or should be) than implementing new one. The only problem I see to this is if the cache align happens at sbrk/mmap level. > > -adrian > _______________________________________________ > [email protected] mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "[email protected]" --- --- Eduardo Morras <[email protected]> _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[email protected]"
