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simple_sequential_baseline_test

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simple_sequential_baseline_test [2017/10/09 19:52] – adminsimple_sequential_baseline_test [2019/06/28 18:45] – admin
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 You can reverse things to see what the read test looks like, things should be faster on reads in all cases with respect to the SSD: You can reverse things to see what the read test looks like, things should be faster on reads in all cases with respect to the SSD:
  
-<code>$ time dd of=/dev/zero if=tstfile bs=2048k count=512 iflag=direct+<code>$ time dd of=/dev/null if=tstfile bs=2048k count=512 iflag=direct
 2048+0 records in 2048+0 records in
 2048+0 records out 2048+0 records out
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 (testing the DRAM memory, and system in this case) (testing the DRAM memory, and system in this case)
  
-<code>$ time dd of=/dev/zero if=tstfile bs=2048k count=512+<code>$ time dd of=/dev/null if=tstfile bs=2048k count=512
 2048+0 records in 2048+0 records in
 2048+0 records out 2048+0 records out
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 <code>Direct write: 1073741824 bytes (1.1 GB) copied, 14.604 s, 73.5 MB/s <code>Direct write: 1073741824 bytes (1.1 GB) copied, 14.604 s, 73.5 MB/s
 Direct read:  1073741824 bytes (1.1 GB) copied, 16.7439 s, 64.1 MB/s Direct read:  1073741824 bytes (1.1 GB) copied, 16.7439 s, 64.1 MB/s
-Read cache:   1073741824 bytes (1.1 GB) copied, 12.6424 s, 84.9 MB/s+Read cache:   1073741824 bytes (1.1 GB) copied, 0.354082 s, 3.0 GB/s 
 </code> </code>
  
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 <code>Direct write: 1073741824 bytes (1.1 GB) copied, 100.578 s, 10.7 MB/s <code>Direct write: 1073741824 bytes (1.1 GB) copied, 100.578 s, 10.7 MB/s
 Direct read:  1073741824 bytes (1.1 GB) copied, 47.0731 s, 22.8 MB/s Direct read:  1073741824 bytes (1.1 GB) copied, 47.0731 s, 22.8 MB/s
-Read cache:   1073741824 bytes (1.1 GB) copied, 49.5828 s, 21.7 MB/s+Read cache:   1073741824 bytes (1.1 GB) copied, 49.5828 s, 21.7 MB/s</code> 
 + 
 +===Raspberry Pi 4 Model B 4GB. Transcend 8GB microSD Ultimate 600x Class 10 UHS-I=== 
 +<code>Direct write: 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 53.5692 s, 20.0 MB/s 
 +Direct read:  1073741824 bytes (1.1 GB, 1.0 GiB) copied, 25.1142 s, 42.8 MB/s 
 +Read cache:   1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.49443 s, 718 MB/s
 </code> </code>
  
simple_sequential_baseline_test.txt · Last modified: 2022/10/18 18:36 by admin