Am 08.04.2019 23:46, schrieb Anatoli:
Thank you very much for the idea Anatoli!
Running dd with "/dev/zero" and "/dev/null" gave me back a very good
overview what is going on (different server hardware and operating systems)
ironm@wheezy:~$ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4294967296 Bytes (4.3 GB) kopiert, 1.0029 s, 4.3 GB/s
--
ironm@fbsdsrv8:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 &&
sync
4294967296 bytes transferred in 8.432852 secs (509313755 bytes/sec)
--
ironm@fbsdsrv1:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 &&
sync
4294967296 bytes transferred in 5.947370 secs (722162508 bytes/sec)
--
ironm@fbsdsrv2:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 &&
sync
4294967296 bytes transferred in 8.804378 secs (487821753 bytes/sec)
--
ronm@wheezy:~$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4294967296 Bytes (4.3 GB) kopiert, 0.410687 s, 10.5 GB/s
--
ironm@wheezy:~$ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
536870912 Bytes (537 MB) kopiert, 0.0558006 s, 9.6 GB/s
--
ironm@fbsdsrv8:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 &&
sync
4294967296 bytes transferred in 1.338350 secs (3209151777 bytes/sec)
--
ironm@fbsdsrv8:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
536870912 bytes transferred in 0.167219 secs (3210581655 bytes/sec)
--
ironm@fbsdsrv1:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 &&
sync
4294967296 bytes transferred in 1.173098 secs (3661217181 bytes/sec)
--
ironm@fbsdsrv1:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
536870912 bytes transferred in 0.191353 secs (2805662938 bytes/sec)
--
ironm@fbsdsrv2:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 &&
sync
4294967296 bytes transferred in 1.159899 secs (3702879890 bytes/sec)
--
ironm@fbsdsrv2:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
536870912 bytes transferred in 0.213278 secs (2517231248 bytes/sec)
--
obsdsrv2$ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4294967296 bytes transferred in 9.136 secs (470078173 bytes/sec)
--
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4294967296 bytes transferred in 11.280 secs (380734881 bytes/sec)
--
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4294967296 bytes transferred in 10.167 secs (422400700 bytes/sec)
--
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=2048 && sync
2147483648 bytes transferred in 4.515 secs (475551520 bytes/sec)
--
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=1024 && sync
1073741824 bytes transferred in 1.728 secs (621203080 bytes/sec)
--
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
536870912 bytes transferred in 0.265 secs (2021821094 bytes/sec)
Kind regards
Mark
--
m...@it-infrastrukturen.org
ironm@wheezy:~$ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4096+0 Datensätze ein
4096+0 Datensätze aus
4294967296 Bytes (4.3 GB) kopiert, 1.0029 s, 4.3 GB/s
real 0m1.231s
user 0m0.000s
sys 0m1.224s
---
ironm@fbsdsrv8:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 8.432852 secs (509313755 bytes/sec)
8.79 real 0.01 user 3.36 sys
---
ironm@fbsdsrv1:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 5.947370 secs (722162508 bytes/sec)
6.41 real 0.00 user 4.65
---
ironm@fbsdsrv2:~ $ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 8.804378 secs (487821753 bytes/sec)
9.26 real 0.00 user 4.94 sys
--------------------------------------------------------------------------------
ronm@wheezy:~$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 Datensätze ein
4096+0 Datensätze aus
4294967296 Bytes (4.3 GB) kopiert, 0.410687 s, 10.5 GB/s
real 0m0.412s
user 0m0.000s
sys 0m0.408s
ironm@wheezy:~$ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
512+0 Datensätze ein
512+0 Datensätze aus
536870912 Bytes (537 MB) kopiert, 0.0558006 s, 9.6 GB/s
real 0m0.057s
user 0m0.000s
sys 0m0.056s
---
ironm@fbsdsrv8:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 1.338350 secs (3209151777 bytes/sec)
1.34 real 0.00 user 1.34 sys
ironm@fbsdsrv8:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
512+0 records in
512+0 records out
536870912 bytes transferred in 0.167219 secs (3210581655 bytes/sec)
0.17 real 0.00 user 0.17 sys
---
ironm@fbsdsrv1:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 1.173098 secs (3661217181 bytes/sec)
1.17 real 0.00 user 1.17 sys
ironm@fbsdsrv1:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
512+0 records in
512+0 records out
536870912 bytes transferred in 0.191353 secs (2805662938 bytes/sec)
0.19 real 0.00 user 0.18 sys
---
ironm@fbsdsrv2:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 1.159899 secs (3702879890 bytes/sec)
1.16 real 0.00 user 1.16 sys
ironm@fbsdsrv2:~ $ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
512+0 records in
512+0 records out
536870912 bytes transferred in 0.213278 secs (2517231248 bytes/sec)
0.21 real 0.00 user 0.21 sys
---------------------------------------------------------------------------
obsdsrv2$ time dd if=/dev/zero of=file1.tmp bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 9.136 secs (470078173 bytes/sec)
0m09.15s real 0m00.00s user 0m04.77s system
---
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 11.280 secs (380734881 bytes/sec)
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=4096 && sync
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 10.167 secs (422400700 bytes/sec)
0m10.16s real 0m00.00s user 0m03.63s system
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=2048 && sync
2048+0 records in
2048+0 records out
2147483648 bytes transferred in 4.515 secs (475551520 bytes/sec)
0m04.51s real 0m00.00s user 0m01.85s system
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=1024 && sync
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 1.728 secs (621203080 bytes/sec)
0m01.72s real 0m00.00s user 0m00.91s system
obsdsrv2$ time dd if=file1.tmp of=/dev/null bs=1M count=512 && sync
512+0 records in
512+0 records out
536870912 bytes transferred in 0.265 secs (2021821094 bytes/sec)
0m00.26s real 0m00.00s user 0m00.26s system
