A previous article [1] presented memory contention data for an Intel SE7500WV2 motherboard. In this report, data for a Tyan 2762 (dual Athlon with AMD-760 chipset) and a Supermicro P3TDL3 (Dual PIII with Serverworks LE chipset) are presented.
To measure the effect of two programs running on a dual node we can measure the time it takes for a single copy of a program and then measure the time it takes to run two copies of the same program. If the program scales perfectly then the times should be identical. If the program does not scale perfectly the time should be between one and two times the single program time. A speedup measure can be calculated as follows:
Where CTIME1 is the time for running program copy1 concurrently
with copy2 of the program, CTIME2 is the time for running
program copy2 concurrently with copy1 one of the program, and STIME
is the time to run one copy of the program.
From this equations we see that if CTIME1=CTIME2=STIME (perfect speed up) we get a speedup of 2. If (CTIME1+CTIME2)=2*STIME (no speedup) we get an answer of 1 which indicates no speed-up.