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febeling/create really big files from shell (mac here, linux similar)

Created April 2, 2009 13:45
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create really big files from shell (mac here, linux similar)
$ time dd if=/dev/urandom of=testfile bs=1024 count=$((1024 * 1024))
1048576+0 records in
1048576+0 records out
1073741824 bytes transferred in 158.475750 secs (6775433 bytes/sec)
real 2m38.479s
user 0m1.718s
sys 2m29.530s
$ time dd if=/dev/zero of=testfile bs=1024 count=1 seek=$((1024 * 1024))
1+0 records in
1+0 records out
1024 bytes transferred in 0.000075 secs (13634817 bytes/sec)
real 0m17.936s
user 0m0.001s
sys 0m0.844s
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