I’ll be breaking down the following command part by part:<\/p>\n
time dd if=\/dev\/zero of=test.dat bs=1024 count=100000<\/p>\n
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What does time do? It runs a process and then captures how long it took to execute.<\/p>\n
What about DD? Well, it’s a command that copies data from a standard input to a standard output.<\/p>\n
What about the params if, of, bs, and count?<\/p>\n
“if”: It’s decently obvious, but “if” specifies the input, in this case we’re taking input from a special file\u00a0that provides as many null characters as there are read from it; an infinity file of sorts.<\/p>\n
“of”: It’s the output file.<\/p>\n
“bs”: Byte size<\/p>\n
“count”: the number of blocks<\/p>\n
So all together, the command writes 100,000 blocks of 1,024 bytes of binary zeroes into the file of “test.dat”. In other words, generates a 100 MB file. This command allows you to generate a 100 MB file and test the \u00a0IO performance of a system. As we move towards a world we’re optimizing the crap out of everything, this is a very useful command to know.<\/p>\n","protected":false},"excerpt":{"rendered":"
I’ll be breaking down the following command part by part: time dd if=\/dev\/zero of=test.dat bs=1024 count=100000 What does time do? It runs a process and then captures how long it took to execute. What about DD? Well, it’s a command that copies data from a standard input to a standard output. What about the … <\/p>\n