パイプラインがデータを処理するのにかかる時間を確認しようとしています。結果を保存します
clock_gettime (CLOCK_REALTIME, &start);
入力バッファにデータ項目を追加するとき。
次に、その時間を使用して、アイテムの処理にかかった時間を計算します。
最初のいくつかの項目では問題なく動作しているように見えますが、その後は非常識な結果が得られます。
この関数を使用して経過時間を計算します
double xelapsed (struct timespec a, struct timespec b)
{
return (a.tv_sec - b.tv_sec) * 1000000.0
+ (a.tv_nsec - b.tv_nsec) / 1000.0;
}
これは私が最終的にするものです：
bash-4.1$ ./pipe
Latency: 1.447000 μs
Latency: 81.549000 μs
Latency: 104.253000 μs
Latency: 112.497000 μs
Latency: 121.307000 μs
Latency: 128.993000 μs
Latency: 136.334000 μs
Latency: 143.237000 μs
Latency: 147.910000 μs
Latency: 152.242000 μs
Latency: 156.492000 μs
Latency: 160.729000 μs
Latency: 164.793000 μs
Latency: 168.782000 μs
Latency: 172.756000 μs
Latency: 176.720000 μs
Latency: 175.370000 μs
Latency: 184.937000 μs
Latency: 183.424000 μs
Latency: 187.353000 μs
Latency: 196.870000 μs
Latency: 200.874000 μs
Latency: 205.332000 μs
Latency: 209.353000 μs
Latency: 213.677000 μs
Latency: 218.040000 μs
Latency: 222.435000 μs
Latency: 226.559000 μs
Latency: 230.897000 μs
Latency: 235.170000 μs
Latency: 239.481000 μs
Latency: 243.829000 μs
Latency: 247.709000 μs
Latency: 251.974000 μs
Latency: 256.338000 μs
Latency: 260.363000 μs
Latency: 264.832000 μs
Latency: 269.293000 μs
Latency: 273.171000 μs
Latency: 277.525000 μs
Latency: 281.701000 μs
Latency: 285.674000 μs
Latency: 290.187000 μs
Latency: 294.239000 μs
Latency: 298.504000 μs
Latency: 302.604000 μs
Latency: 307.095000 μs
Latency: 310.792000 μs
Latency: 315.343000 μs
Latency: 318.812000 μs
Latency: 322.721000 μs
Latency: 327.149000 μs
Latency: 331.065000 μs
Latency: 335.114000 μs
Latency: 339.632000 μs
Latency: 342.989000 μs
Latency: 344.433000 μs
Latency: 348.567000 μs
Latency: 352.376000 μs
Latency: 356.801000 μs
Latency: 360.752000 μs
Latency: 364.337000 μs
Latency: 368.808000 μs
Latency: 372.082000 μs
Latency: 376.500000 μs
Latency: 380.283000 μs
Latency: 384.611000 μs
Latency: 388.134000 μs
Latency: 392.083000 μs
Latency: 396.484000 μs
Latency: 400.428000 μs
Latency: 1426625359409111.000000 μs
Latency: 1426625359409117.250000 μs
Latency: 1426625359409123.250000 μs
Latency: 1426625359409128.750000 μs
Latency: 1426625359409134.500000 μs
Latency: 1426625359409140.500000 μs
Latency: 1426625359409146.000000 μs
Latency: 1426625359409151.750000 μs
Latency: 1426625359409157.500000 μs
Latency: 1426625359409163.000000 μs
Latency: 1426625359409168.500000 μs
Latency: 1426625359409174.250000 μs
Latency: 1426625359409180.000000 μs
Latency: 1426625359409185.500000 μs
Latency: 1426625359409191.000000 μs
Latency: 1426625359409196.750000 μs
Latency: 1426625359409202.250000 μs