Seasonal Fuel Efficiency

It is well-known that a car’s fuel efficiency decreases during the winter months. There are many potential contributors, including increased air density causing drag, excessively rich fuel mixture from cold starts taking a long time to warm up, increased pumping losses from dense cold air intake, increased engine oil viscosity, increased rolling friction from colder . . . → Read More: Seasonal Fuel Efficiency

Core 2, Nehalem, FPGA CAD

See also: Ivy Bridge Benchmarks

Here are some FPGA CAD benchmarks across a few relatively-modern machines. The original motivation was to figure out why VPR ran much slower on a Core 2 Xeon 5160 system than a desktop-class Core 2 Quad Q9550. A secondary goal is to measure the Core i7-980X @ 4215 MHz. I . . . → Read More: Core 2, Nehalem, FPGA CAD

Compiler Performance

Sun claims their Sun Studio 12 compiler performs well on SPEC (Free Compiler Wins Nehalem Race by 2x). So I compared PHP 5.3.1 running PHPspeed 1.0 beta (using “Real World PHP Benchmark”) and xcache 1.3.0, compiled with Sun Studio 12, GCC 4.4.1, and Intel C Compiler 11.1.064.

System Mandriva 2010.0 x86_64 kernel 2.6.31.6-server-1mnb, Core 2 . . . → Read More: Compiler Performance