# 2016q3 Homework1 (compute-pi)

## 案例分析：compute-pi

### 用 Gnuplot 產生效能分析表

- 執行 `$ make plot`，透過 gnuplot 產生多種實做的效能分析比較圖表
- Makefile

plot: output.txt
	gnuplot runtime.gp

- Gnuplot 執行 script：runtime.gp

reset
set ylabel 'time(sec)'
set style fill solid
set title 'perfomance comparison'
set term png enhanced font 'Verdana,10'
set output 'runtime.png'

plot [:][0:30]'output.txt' using 1 with histogram title 'Baseline', \
'' using ($0-0.2):($1+1):1 with labels title ' ', \
'' using 2 with histogram title 'OpenMP 2', \
'' using ($0-0.05):($2+1):2 with labels title ' ', \
'' using 3 with histogram title 'OpenMP 2', \
'' using ($0+0.1):($3+1):3 with labels title ' ', \
'' using 4 with histogram title 'AVX SIMD', \
'' using ($0+0.2):($4+1):4 with labels title ' ', \
'' using 5 with histogram title 'AVX SIMD + Loop unrolling', \
'' using ($0+0.35):($5+1):5 with labels title ' ' \

- 效能分析表