在IOzone输出中，"Min“和”吞吐量“的含义是什么？

Question

我是IOzone的新用户，当我使用命令：./iozone -i 0 -i 1 -t 2 -T运行IOzone时，它会生成以下结果(部分)：

使用的

命令行是：./iozone -i 0 -i 1 -t 2 -T输出，以字节/秒时间分辨率= 0.000001秒为单位。处理器缓存大小设置为1024千字节。处理器缓存行大小设置为32字节。文件步长设置为17 *记录大小。用2个线程进行吞吐量测试，每个线程在4K记录中写入一个512字节文件。

Children see throughput for  2 initial writers  =  650943.69 KB/sec
Parent sees throughput for  2 initial writers   =   13090.24 KB/sec
Min throughput per thread           =  275299.72 KB/sec 
Max throughput per thread           =  375643.97 KB/sec
Avg throughput per thread           =  325471.84 KB/sec
Min xfer                    =     356.00 KB

Children see throughput for  2 rewriters    = 1375881.50 KB/sec
Parent sees throughput for  2 rewriters     =   10523.74 KB/sec                                                
Min throughput per thread           = 1375881.50 KB/sec 
Max throughput per thread           = 1375881.50 KB/sec
Avg throughput per thread           =  687940.75 KB/sec
Min xfer                    =     512.00 KB

Children see throughput for  2 readers      = 2169601.25 KB/sec
Parent sees throughput for  2 readers       =   27753.94 KB/sec
Min throughput per thread           = 2169601.25 KB/sec 
Max throughput per thread           = 2169601.25 KB/sec
Avg throughput per thread           = 1084800.62 KB/sec
Min xfer                    =     512.00 KB

Children see throughput for 2 re-readers    = 2572435.25 KB/sec
Parent sees throughput for 2 re-readers     =   26311.78 KB/sec
Min throughput per thread           = 2572435.25 KB/sec 
Max throughput per thread           = 2572435.25 KB/sec
Avg throughput per thread           = 1286217.62 KB/sec
Min xfer                    =     512.00 KB

iozone test complete.

我对“吞吐量”和"Min“的含义感到困惑，有人能帮我吗？顺便问一下，为什么孩子和父母的吞吐量是不同的呢？谢谢!

Answer 1

Min xfer指一次写入的最小数据量。“每个线程在4 K字节记录中写入一个512字节文件”

因此，如果Min xfer是512.00 KB，那么它会立即将整个实际文件写入磁盘(将所有4K字节记录分组在一起)。

由于OS I/O缓冲，子级和父级吞吐量不同。iozone不强制使用吞吐量测试直接(非缓冲)读或写。真正测试的是系统的缓冲区缓存+磁盘缓存+磁盘速度组合。