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root@cubieboard4:/run/shm# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 29G 965M 27G 4% /
devtmpfs 805M 4.0K 805M 1% /dev
none 4.0K 0 4.0K 0% /sys/fs/cgroup
none 162M 388K 161M 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 806M 500M 306M 63% /run/shm
none 100M 0 100M 0% /run/user
root@cubieboard4:/run/shm# pwd
/run/shm
root@cubieboard4:/run/shm# dd if=/dev/zero of=hyy.txt bs=10M count=50
50+0 records in
50+0 records out
524288000 bytes (524 MB) copied, 3.49528 s, 150 MB/s
root@cubieboard4:/run/shm# dd if=/dev/zero of=hyy.txt bs=100M count=5
5+0 records in
5+0 records out
524288000 bytes (524 MB) copied, 4.05607 s, 129 MB/s
root@cubieboard4:/run/shm# dd if=/dev/zero of=hyy.txt bs=100M count=5
5+0 records in
5+0 records out
524288000 bytes (524 MB) copied, 4.0755 s, 129 MB/s
root@cubieboard4:/run/shm# dd if=/dev/zero of=hyy.txt bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 3.20202 s, 164 MB/s
root@cubieboard4:/run/shm# dd if=/dev/zero of=hyy.txt bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 3.20321 s, 164 MB/s
root@cubieboard4:/run/shm#
root@cubieboard4:/run/shm#
root@cubieboard4:/run/shm#
root@cubieboard4:/run/shm#
root@cubieboard4:/run/shm#
root@cubieboard4:/run/shm# ls
hyy.txt
root@cubieboard4:/run/shm# dd if=./hyy.txt of=/dev/null bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 1.70789 s, 307 MB/s
root@cubieboard4:/run/shm# ls
hyy.txt
root@cubieboard4:/run/shm# ll
total 512000
drwxrwxrwt 2 root root 60 Nov 1 07:52 ./
drwxr-xr-x 19 root root 660 Nov 1 07:47 ../
-rw-r--r-- 1 root root 524288000 Nov 1 07:53 hyy.txt
root@cubieboard4:/run/shm# dd if=./hyy.txt of=/dev/null bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB) copied, 1.60933 s, 326 MB/s
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