Re: OGR-NG on Xeon Phi?
Roman Trunov <[email protected]> Thu, 13 Dec 2012 16:17:27 +0400
| Newsgroups | gmane.comp.distributed-net.rc5 |
|---|---|
| Organization | Proxyma Communications |
| Message-ID | <[email protected]> |
[email protected] wrote: > Additional, the Phi-Cores are equipped with 512Bit SIMD-Units. I dont know any detail of their architecture or commandset, but maybe this could be a great benefit for OGR? The answer really depends on architecture and command set of these units, and latencies of operations. OGR-NG operates on bitmaps of 256 bits long, 512 bits units looks excessive. More important is which kinds of rotations are supported. High-bitness SIMD architectures usually cannot rotate a register by arbitrary number of bits, which is required for OGR. Instead, you have to use two operations - rotate by a whole number of bytes first, then by remaining 0-7 bits. If new command set could overcome this limitation, it could give us some gain. Otherwise, it's quite useless. Roman _______________________________________________ rc5 mailing list rc5-Ra3b/QYEcJ3d140v2zMXi0fjHoOT/h/[email protected] http://lists.distributed.net/mailman/listinfo/rc5