[LINUX] How to create large files at high speed


What command do you use to create an empty file? In my case, I used the touch command if the file size was 0, and the dd command if I needed a file of a certain size, as shown below.

However, apart from the dd command, I learned that there is a command called fallocate as a way to create a file of a certain size, so I compared the performance of both.

[nkojima@akagi sample_files]$ touch sample.txt
[nkojima@akagi sample_files]$ dd if=/dev/zero of=./sample2.txt bs=1K count=1024
1024+0 Record input
1024+0 record output
1048576 bytes(1.0 MB)Copied, 0.00580267 seconds, 181 MB/Seconds
[nkojima@akagi sample_files]$ ls -lah
Total 1.0M
drwxrwxr-x 2 nkojima nkojima 43 June 21 12:18 .
drwx------.5 nkojima nkojima 175 June 21 12:17 ..
-rw-rw-r--1 nkojima nkojima 0 June 21 12:17 sample.txt
-rw-rw-r--  1 nkojima nkojima 1.0M June 21 12:18 sample2.txt

Environment used for testing

Test method

[root@akagi ~]# date; dd if=/dev/zero of=dd.txt bs=1M count=100; date;
Sunday, June 21, 2020 12:48:28 JST
100+0 Record input
100+0 record output
104857600 bytes(105 MB)Copied, 0.0362178 seconds, 2.9 GB/Seconds
Sunday, June 21, 2020 12:48:29 JST
[root@akagi ~]# date; fallocate -l 100m ./fallocate.txt; date;
Sunday, June 21, 2020 12:48:52 JST
Sunday, June 21, 2020 12:48:52 JST

test results

file size Processing time of dd command(Seconds) Processing time of fallocate command(Seconds)
100MB <1 <1
500MB <1 <1
1GB 1 <1
2GB 2 <1
4GB 4 <1
8GB 7 <1
16GB 15 <1

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