useful linux commands
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测试cp卡的读写速度
读
# date && cat /root/appb/disk_release* > /dev/null && date
写
#date && cp /root/appb/disk_release* /root/appb/cptest/ && date
或者用time
time cp /root/appb/disk_release* /root/appb/cptest/
测试nandflash 读写速度
zbimage-linux-xload0 1M大小,写10次
time for i in `seq 1 10`;do cp zbimage-linux-xload0 /mnt/data/ ;done
real 0m0.441s
user 0m0.030s
sys 0m0.410s
22.7M/s
读10次
time for i in `seq 1 10`;do cat /mnt/data/zbimage-linux-xload0 >/dev/null ;done
75.7M/s
real 0m0.132s
user 0m0.020s
sys 0m0.110s
两个都重定向
>/dev/null 2>&1
ln -s target linkname
ln -s /boot boot1
ln -s target linkname
ln -s /boot boot1
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