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Re: [Gcl-devel] Floating-point performance of GCL? Bug?
From: |
Nicolas Neuss |
Subject: |
Re: [Gcl-devel] Floating-point performance of GCL? Bug? |
Date: |
20 Jul 2004 09:13:17 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
Camm Maguire <address@hidden> writes:
> Atlas does not require non-gcc. None such is available on Debian, and
> numerous packages in this distro make use of atlas. The L1 blas
> operations you report above cannot be compared with L3 routines -- the
> former will basically be bound by the memory bandwidth for reasonable
> cases at best. Your 'short' numbers are likely highly misleading, as
> they presuppose finding the entire vector in some level of cache,
> which is very likely not the case on a general call.
OK. But the Atlas L3 routines get their performance by doing daxpy on
short vectors fitting in the cache. So I think that DAXPY-short should
yield an upper bound also to L3 performance (given that function call
overhead does not count for daxpying two vectors of length 256).
Thanks, Nicolas.
- [Gcl-devel] Floating-point performance of GCL? Bug?, Nicolas Neuss, 2004/07/16
- Re: [Gcl-devel] Floating-point performance of GCL? Bug?, Nicolas Neuss, 2004/07/19
- FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Mike Thomas, 2004/07/19
- Re: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Nicolas Neuss, 2004/07/23
- Re: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Camm Maguire, 2004/07/23
- Re: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Nicolas Neuss, 2004/07/26
- Re: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Nicolas Neuss, 2004/07/26
- Re: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Dennis Decker Jensen, 2004/07/26
- RE: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Mike Thomas, 2004/07/26
- RE: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, James Amundson, 2004/07/26
- RE: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Mike Thomas, 2004/07/26
- RE: FW: [Gcl-devel] Floating-point performance of GCL? Bug?, Mike Thomas, 2004/07/26