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- With "noop" option enabled in the I/O scheduler:
- [root@srv sandbox]# echo "noop" > /sys/block/cciss\!c0d0/queue/scheduler
- With 8MB of read ahead cache:
- [root@srv sandbox]# blockdev --setra 8192 /dev/cciss/c0d0
- [root@srv sandbox]# iozone -i 0 -i 1 -i 2 -r 4m -e -t 3 -s 48g
- Iozone: Performance Test of File I/O
- Version $Revision: 3.327 $
- Compiled for 64 bit mode.
- Build: linux
- Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins
- Al Slater, Scott Rhine, Mike Wisner, Ken Goss
- Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
- Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner,
- Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy,
- Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root.
- Run began: Thu Nov 18 10:42:48 2010
- Record Size 4096 KB
- Include fsync in write timing
- File size set to 50331648 KB
- Command line used: iozone -i 0 -i 1 -i 2 -r 4m -e -t 3 -s 48g
- Output is in Kbytes/sec
- Time Resolution = 0.000001 seconds.
- Processor cache size set to 1024 Kbytes.
- Processor cache line size set to 32 bytes.
- File stride size set to 17 * record size.
- Throughput test with 3 processes
- Each process writes a 50331648 Kbyte file in 4096 Kbyte records
- Children see throughput for 3 initial writers = 403348.45 KB/sec
- Parent sees throughput for 3 initial writers = 396017.75 KB/sec
- Min throughput per process = 130588.26 KB/sec
- Max throughput per process = 136556.31 KB/sec
- Avg throughput per process = 134449.48 KB/sec
- Min xfer = 48132096.00 KB
- Children see throughput for 3 rewriters = 388516.96 KB/sec
- Parent sees throughput for 3 rewriters = 383248.16 KB/sec
- Min throughput per process = 127749.85 KB/sec
- Max throughput per process = 132657.72 KB/sec
- Avg throughput per process = 129505.65 KB/sec
- Min xfer = 50331648.00 KB
- Children see throughput for 3 readers = 303065.75 KB/sec
- Parent sees throughput for 3 readers = 303053.32 KB/sec
- Min throughput per process = 100007.34 KB/sec
- Max throughput per process = 102066.11 KB/sec
- Avg throughput per process = 101021.92 KB/sec
- Min xfer = 49319936.00 KB
- Children see throughput for 3 re-readers = 298324.72 KB/sec
- Parent sees throughput for 3 re-readers = 298310.37 KB/sec
- Min throughput per process = 98019.91 KB/sec
- Max throughput per process = 100545.94 KB/sec
- Avg throughput per process = 99441.57 KB/sec
- Min xfer = 49070080.00 KB
- Children see throughput for 3 random readers = 168330.78 KB/sec
- Parent sees throughput for 3 random readers = 168326.31 KB/sec
- Min throughput per process = 55925.84 KB/sec
- Max throughput per process = 56208.99 KB/sec
- Avg throughput per process = 56110.26 KB/sec
- Min xfer = 50081792.00 KB
- Children see throughput for 3 random writers = 301058.52 KB/sec
- Parent sees throughput for 3 random writers = 297864.71 KB/sec
- Min throughput per process = 99511.12 KB/sec
- Max throughput per process = 101287.23 KB/sec
- Avg throughput per process = 100352.84 KB/sec
- Min xfer = 49451008.00 KB
- iozone test complete.
- [root@srv sandbox]#
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