linux终端shell语句-CSDN博客

本文链接：https://blog.csdn.net/fchyang/article/details/133760982

文章讲述了在Linux终端中使用dd命令进行磁盘填充和清空操作，以及通过for循环执行多次以测试emmc写入速度，并展示了drop_caches对系统缓存的影响。

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简要记录几个语句，后续补充：

1、dd if=/dev/zero bs=1024 count=1048576 of=/data/oneGB

# dd if=/dev/zero bs=1024 count=1048576 of=/data/oneGB
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 20.995653 s, 49 M/s

查看emmc write speed

2、for i in $(seq 5);do echo 3 > /proc/sys/vm/drop_caches;dd if=/data/oneGB of=/dev/null bs=1024;done

# for i in $(seq 5);do echo 3 > /proc/sys/vm/drop_caches;dd if=/data/oneGB of=/dev/null bs=1024;done
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 10.238656 s, 100 M/s
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 10.319954 s, 99 M/s
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 10.208749 s, 100 M/s
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 10.070906 s, 102 M/s
1048576+0 records in
1048576+0 records out
1073741824 bytes (1.0 G) copied, 10.384142 s, 99 M/s

查看5次emmc read speed