here is another results:
250 writers and readers
./iozone -l 250 -u 250 -r 4k -s 4k /storage/
Iozone: Performance Test of File I/O
Version $Revision: 3.420 $
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, Dave Boone,
Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root,
Fabrice Bacchella, Zhenghua Xue, Qin Li, Darren Sawyer,
Vangel Bojaxhi, Ben England, Vikentsi Lapa.
Run began: Tue Aug 20 13:27:23 2013
Record Size 4 KB
File size set to 4 KB
Command line used: ./iozone -l 250 -u 250 -r 4k -s 4k /storage/
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.
Min process = 250
Max process = 250
Throughput test with 250 processes
Each process writes a 4 Kbyte file in 4 Kbyte records
Children see throughput for 250 initial writers = 183574.41 KB/sec
Parent sees throughput for 250 initial writers = 41.31 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 92791.41 KB/sec
Avg throughput per process = 734.30 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 rewriters = 237970.19 KB/sec
Parent sees throughput for 250 rewriters = 177.05 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 70254.67 KB/sec
Avg throughput per process = 951.88 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 readers = 150034.45 KB/sec
Parent sees throughput for 250 readers = 89.00 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 77028.36 KB/sec
Avg throughput per process = 600.14 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 re-readers = 158434.95 KB/sec
Parent sees throughput for 250 re-readers = 95.97 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 79965.49 KB/sec
Avg throughput per process = 633.74 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 reverse readers = 76676.32 KB/sec
Parent sees throughput for 250 reverse readers = 47.02 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 76676.32 KB/sec
Avg throughput per process = 306.71 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 stride readers = 160079.23 KB/sec
Parent sees throughput for 250 stride readers = 46.93 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 160079.23 KB/sec
Avg throughput per process = 640.32 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 random readers = 65585.78 KB/sec
Parent sees throughput for 250 random readers = 41.02 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 65585.78 KB/sec
Avg throughput per process = 262.34 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 mixed workload = 107680.38 KB/sec
Parent sees throughput for 250 mixed workload = 13.44 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 107680.38 KB/sec
Avg throughput per process = 430.72 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 random writers = 60610.08 KB/sec
Parent sees throughput for 250 random writers = 19.31 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 60610.08 KB/sec
Avg throughput per process = 242.44 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 pwrite writers = 90783.00 KB/sec
Parent sees throughput for 250 pwrite writers = 21.55 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 90783.00 KB/sec
Avg throughput per process = 363.13 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 pread readers = 301355.84 KB/sec
Parent sees throughput for 250 pread readers = 183.05 KB/sec
Min throughput per process = 0.00 KB/sec
Max throughput per process = 83549.50 KB/sec
Avg throughput per process = 1205.42 KB/sec
Min xfer = 0.00 KB
Children see throughput for 250 fwriters = 43998714.84 KB/sec
Parent sees throughput for 250 fwriters = 3877.68 KB/sec
Min throughput per process = 338.50 KB/sec
Max throughput per process = 285299.19 KB/sec
Avg throughput per process = 175994.86 KB/sec
Min xfer = 4.00 KB
Children see throughput for 250 freaders = 44996628.02 KB/sec
Parent sees throughput for 250 freaders = 15547.77 KB/sec
Min throughput per process = 66.59 KB/sec
Max throughput per process = 233647.44 KB/sec
Avg throughput per process = 179986.51 KB/sec
Min xfer = 4.00 KB
iozone test complete.
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