MyDeDub 0.4 performance data
For these tests consumer hardware is used. MySQL on fibre disks will probably give much better performance.
Test systems
database server
- disks: 2xMaxtor 6L080P0
- 1GB ram
- AMD Sempron 2300+ (1.6GHz, 256KB cache)
database server disk performance
2x 16GB partition in RAID0
| hdparm -t: | 90MB/s |
| IOPS (read): | 93 |
| IOPS (write): | 390 (probably due to write caches) |
| dd if=/dev/zero of=/dev/md0 bs=4096 count=262144: | 50.4MB/s |
| dd if=/dev/md0 of=/dev/null bs=4096 count=262144: | 92.7MB/s |
MySQL info
Databases stored on the RAID0 volume. Filesystem: ext2(!), tables: MyISAM, default Debian MySQL configuration (5.1.45-1)
MyDeDub system
- 4GB ram
- Intel Core2Duo Q9450 (2.66GHz, 6144KB cache)
network
1Gb, connected via consume 3COM switch and Via VT6102 and Realtak RTL-8169 ethernet controllers
Tests
MyDeDub datastore is emptied after each test with writes ('TRUNCATE table' in MySQL), MyDeDub is restarted after each test, runs with 256MB cache
empty datastore
| hdparm -t: | 7.67MB/s |
| IOPS (read): | 24.9 |
| IOPS (write): | 24.6 |
| dd if=/dev/zero of=/dev/nbd0 bs=262144 count=2 oflag=dsync: | 1.6MB/s |
| mke2fs -j /dev/nbd0 (*1) | 2m56.062s |
| tar xjf /linux-source-2.6.30.tar.bz2 + sync (*2): | 7m56.735s |
| copying /home-filesystem using dd, bs=262144 (6GB of sources and photo's) (*3): | 1.4MB/s |
| dd if=/dev/nbd0 of=/dev/null (*4): | 3.6MB/s |
Note: step *2 uses the data from *1 with a restart of MyDeDub.
Note: step *4 uses the data from *3 with a restart of MyDeDub.
Performance graph of *3:
full datastore
| hdparm -t: | 3.16MB/s |
| IOPS (read): | 24.83 |
| IOPS (write): | 17.7 |
| dd if=/dev/zero of=/dev/nbd0 bs=262144 count=2 oflag=dsync: | 505KB/s |
| dd if=/dev/nbd0 of=/dev/null bs=262144 count=2: | 3.4GB/s |
| mke2fs -j /dev/nbd0 | 5m29.491s |
| tar xjf /linux-source-2.6.30.tar.bz2 + sync: | 10m12.498s |
copying /home-filesystem using measurecopy, blocksize=1048576
(6GB of sources and photo's initial
data is / of a Debian system): | see below *5 |
Performance graph of *5:
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