# time dd if=/dev/urandom ibs=1M count=5 | md5sum
5+0 records in
10240+0 records out
c70b84415e6dd943ef1054f4cfdc5839 -
5242880 bytes (5.2 MB) copied, 0.705356 seconds, 7.4 MB/s
real 0m0.759s
user 0m0.012s
sys 0m0.708s
# time dd if=/dev/urandom ibs=1M count=50 | md5sum
50+0 records in
102400+0 records out
52428800 bytes (52 MB) copied, 7.16639 seconds, 7.3 MB/s
459e2d00b5a06761316caa9093d40b5e -
real 0m7.184s
user 0m0.060s
sys 0m6.920s
# time dd if=/dev/urandom ibs=1M count=500 | md5sum
500+0 records in
1024000+0 records out
524288000 bytes (524 MB) copied, 69.3534 seconds, 7.6 MB/s
488c72f1c1e3df27535fc04082902eec -
real 1m9.362s
user 0m0.524s
sys 1m7.668s
LZ可以猜猜,如果count继续变大,要算个MD5要多久?