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simple_sequential_baseline_test [2017/06/08 15:42] – 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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 user 0m0.000s user 0m0.000s
 sys 0m0.296s</code> sys 0m0.296s</code>
 +
 +===IBM P520, POWER6, PowerVM (with RHEL6), Hitachi Ultrastar 15K300 SAS, 147GB===
 +<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
 +Read cache:   1073741824 bytes (1.1 GB) copied, 0.354082 s, 3.0 GB/s
 +
 +</code>
  
 ===USB UAS attached Samsung 850 EVO 500GB SSD, attached to Intel NUC NUC6i7KYK=== ===USB UAS attached Samsung 850 EVO 500GB SSD, attached to Intel NUC NUC6i7KYK===
 +Benchmarking an encrypted filesystem, the speed drops to around 370MB/sec write, 430MB/sec read.
 <code>Direct write: 2147483648 bytes (2,1 GB, 2,0 GiB) copied, 5,11402 s, 420 MB/s <code>Direct write: 2147483648 bytes (2,1 GB, 2,0 GiB) copied, 5,11402 s, 420 MB/s
 Direct read:  2147483648 bytes (2,1 GB, 2,0 GiB) copied, 4,7174 s, 455 MB/s Direct read:  2147483648 bytes (2,1 GB, 2,0 GiB) copied, 4,7174 s, 455 MB/s
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 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
 +
 +===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