How fast is your hard disk? (Random access)

[shadowman]

Με αφορμή τους δίσκους SSD και τις κορυφαίες επιδόσεις τους σκέφτηκα να τεστάρω το δικό μου setup για να δω που βρίσκομαι.
Το test βρίσκεται εδώ:
http://www.linuxinsight.com/how_fast_is_your_disk.html

Οδηγίες:
κατεβάζουμε την multi thread έκδοση του seeker:
http://smp.if.uj.edu.pl/~baryluk/seeker_baryluk.c

compile

gcc -o seeker_baryluk -O2 -march=native seeker_baryluk.c -pthread

εκτέλεση

./seeker_baryluk device number_of_threads

με 2 δίσκους ( seagate) sda,sdb σε raid 0 (dev/md1) και από πάνω lvm
σε fedora 11 2.6.30.5-43.fc11.x86_64

Αποτελέσματα:
1 Thread:

sda

Benchmarking /dev/sda [625142448 blocks, 320072933376 bytes, 298 GB, 305245 MB, 320 GiB, 320072 MiB]
[512 logical sector size, 512 physical sector size]
[1 threads]
Wait 30 seconds..............................
Results: 64 seeks/second, 15.416 ms random access time (124836399 < offsets < 319450616235)

sdb

Benchmarking /dev/sdb [488395055 blocks, 250058268160 bytes, 232 GB, 238474 MB, 250 GiB, 250058 MiB]
[512 logical sector size, 512 physical sector size]
[1 threads]
Wait 30 seconds..............................
Results: 64 seeks/second, 15.464 ms random access time (27322523 < offsets < 250010845107)

md0 (raid)

Benchmarking /dev/md0 [976784384 blocks, 500113604608 bytes, 465 GB, 476945 MB, 500 GiB, 500113 MiB]
[512 logical sector size, 512 physical sector size]
[1 threads]
Wait 30 seconds..............................
Results: 69 seeks/second, 14.486 ms random access time (546176421 < offsets < 499610016298)

lvm

Benchmarking /dev/vg_workstation/LogVol00 [262668288 blocks, 134486163456 bytes, 125 GB, 128256 MB, 134 GiB, 134486 MiB]
[512 logical sector size, 512 physical sector size]
[1 threads]
Wait 30 seconds..............................
Results: 90 seeks/second, 11.001 ms random access time (82324445 < offsets < 134405847269)

16 threads:
sda

Benchmarking /dev/sda [625142448 blocks, 320072933376 bytes, 298 GB, 305245 MB, 320 GiB, 320072 MiB]
[512 logical sector size, 512 physical sector size]
[16 threads]
Wait 30 seconds..............................
Results: 120 seeks/second, 8.287 ms random access time (85273146 < offsets < 320071703600)

sdb

Benchmarking /dev/sdb [488395055 blocks, 250058268160 bytes, 232 GB, 238474 MB, 250 GiB, 250058 MiB]
[512 logical sector size, 512 physical sector size]
[16 threads]
Wait 30 seconds..............................
Results: 106 seeks/second, 9.428 ms random access time (81864868 < offsets < 250049918886)

md0

Benchmarking /dev/md0 [976784384 blocks, 500113604608 bytes, 465 GB, 476945 MB, 500 GiB, 500113 MiB]
[512 logical sector size, 512 physical sector size]
[16 threads]
Wait 30 seconds..............................
Results: 196 seeks/second, 5.092 ms random access time (6935271 < offsets < 500075885391)

lvm

Benchmarking /dev/vg_workstation/LogVol00 [262668288 blocks, 134486163456 bytes, 125 GB, 128256 MB, 134 GiB, 134486 MiB]
[512 logical sector size, 512 physical sector size]
[16 threads]
Wait 30 seconds..............................
Results: 239 seeks/second, 4.168 ms random access time (1887141 < offsets < 134472193634)

Επίσης έχω στο

 sudo hdparm -t /dev/συσκευή

/dev/sda:
 Timing buffered disk reads:  328 MB in  3.01 seconds = 108.82 MB/sec
/dev/sdb:
 Timing buffered disk reads:  278 MB in  3.02 seconds =  92.01 MB/sec
/dev/md0:
 Timing buffered disk reads:  544 MB in  3.01 seconds = 180.95 MB/sec
/dev/vg_workstation/LogVol00:
 Timing buffered disk reads:  460 MB in  3.01 seconds = 152.68 MB/sec

[WAntilles]

Εγώ έκανα χθες πολύ πιο απλά, αυτό.

[Antonis94]

Debian Testing.

2.6.30-1-amd64 x86_64

./seeker_baryluk /dev/sda 2

Spoiler:

Seeker v3.0, 2009-06-17, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [625140335 blocks, 320071851520 bytes, 298 GB, 305244 MB, 320 GiB, 320071 MiB]
[512 logical sector size, 512 physical sector size]
[2 threads]
Wait 30 seconds..............................
Results: 60 seeks/second, 16.438 ms random access time (113570406 < offsets < 319961151274)

Και:

hdparm -Tt /dev/sda

Spoiler:

/dev/sda:
Timing cached reads: 2108 MB in 2.00 seconds = 1053.40 MB/sec
Timing buffered disk reads: 284 MB in 3.00 seconds = 94.61 MB/sec

[shadowman]

Μέτρηση SSD INTEL 80G G2:

Seeker v3.0, 2009-06-17, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [156301488 blocks, 80026361856 bytes, 74 GB, 76319 MB, 80 GiB, 80026 MiB]
[512 logical sector size, 512 physical sector size]
[1 threads]
Wait 30 seconds..............................
Results: 5235 seeks/second, 0.191 ms random access time (259551 < offsets < 80026154549)

η μέτρηση είναι από το laptop (2 πύρηνο 3 ετίας) και όχι από το desktop που είναι 4πήρυνο και πρόσφατο
Σε μετρήσεις με περισσότερα threads η απόδοση πέφτει λίγο στο γύρω στο 4900 seeks/second