~4Dgifts/toolbox/src/exampleCode/MP README This tree contains examples relating to multi-processing/parallel computing timer : This subtree demonstrates the use of a high resolution timer of the io3 board on an r4k-based SGI system. The io3 clock is 16 Mhz, 32 bits. Period is ~ 268 seconds. Getitimer has a 100 Hz default resolution. With ftimer(1) and by changing FASTHZ in /usr/sysgen/master.d/kernel it is possible to bring the resolution up to 1800 (Power Series systems), i.e., 555 microseconds. This resolution is too coarse for the purpose of some measurements. Two sub-directories--highres and regular--containing contrasting Linpack 100 examples using a regular and the high resolution timers are shown. The Linpack 100 benchmark takes about .07 second to run and thus the use of a higher resolution timer is necessary. Also included is a similar io4 timer for the challenge system.
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