IOzone输出中的“Min xfer”和“throughput”是什么意思答案

【问题标题】：What's the meaning of "Min xfer" and "throughput" in the output of IOzoneIOzone输出中的“Min xfer”和“throughput”是什么意思
【发布时间】：2011-11-28 11:31:15
【问题描述】：

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）：

Command line used: ./iozone -i 0 -i 1 -t 2 -T
Output is in Kbytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
Throughput test with 2 threads
Each thread writes a 512 Kbyte file in 4 Kbyte records

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“最小 xfer”的含义感到困惑，有人可以帮助我吗？顺便说一句，为什么从孩子和父母看到的吞吐量不同？谢谢！

【问题讨论】：

标签： linux io filesystems benchmarking iozone

【解决方案1】：

Min xfer 是指一次写入的最小数据量。 "每个线程在 4 KB 记录中写入一个 512 KB 的文件"

因此，如果 Min xfer 为 512.00 KB，它会立即将整个实际文件写入磁盘（将所有 4 KB 记录组合在一起）。

由于 OS I/O 缓冲，子吞吐量和父吞吐量不同。 iozone 不会通过吞吐量测试强制直接（非缓冲）读取或写入。您真正测试的是系统的缓冲区缓存 + 磁盘缓存 + 磁盘速度组合。

【讨论】：