Hi all,
among many other things I recently restarted benchmarking ZFS over NFS3
performance between X4500 (host) and Linux clients. I've just iozone
quite a while ago and am still a bit at a loss understanding the
results. The automatic mode is pretty ok (and generates nice 3D plots
for the people higher up the ladder), but someone gave a hint to use
multiple threads for testing the ops/s and here I'm a bit at a loss how
to understand the results and if the values are reasonable or not.
Here is the current example - can anyone with deeper knowledge tell me
if these are reasonable values to start with?
Thanks a lot
Carsten
Iozone: Performance Test of File I/O
Version $Revision: 3.315 $
Compiled for 64 bit mode.
Build: linux-AMD64
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: Wed Jan 7 09:31:49 2009
Multi_buffer. Work area 16777216 bytes
OPS Mode. Output is in operations per second.
Record Size 8 KB
SYNC Mode.
File size set to 4194304 KB
Command line used: ../iozone3_315/src/current/iozone -m -t 8 -T
-O -r 8k -o -s 4G iozone
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 8 threads
Each thread writes a 4194304 Kbyte file in 8 Kbyte records
Children see throughput for 8 initial writers = 4925.20 ops/sec
Parent sees throughput for 8 initial writers = 4924.65 ops/sec
Min throughput per thread = 615.61 ops/sec
Max throughput per thread = 615.69 ops/sec
Avg throughput per thread = 615.65 ops/sec
Min xfer = 524219.00 ops
Children see throughput for 8 rewriters = 4208.45 ops/sec
Parent sees throughput for 8 rewriters = 4208.42 ops/sec
Min throughput per thread = 525.88 ops/sec
Max throughput per thread = 526.22 ops/sec
Avg throughput per thread = 526.06 ops/sec
Min xfer = 523944.00 ops
Children see throughput for 8 readers = 11986.99 ops/sec
Parent sees throughput for 8 readers = 11986.46 ops/sec
Min throughput per thread = 1481.13 ops/sec
Max throughput per thread = 1512.71 ops/sec
Avg throughput per thread = 1498.37 ops/sec
Min xfer = 513361.00 ops
Children see throughput for 8 re-readers = 12017.70 ops/sec
Parent sees throughput for 8 re-readers = 12017.22 ops/sec
Min throughput per thread = 1486.72 ops/sec
Max throughput per thread = 1520.35 ops/sec
Avg throughput per thread = 1502.21 ops/sec
Min xfer = 512761.00 ops
Children see throughput for 8 reverse readers = 25741.62 ops/sec
Parent sees throughput for 8 reverse readers = 25735.91 ops/sec
Min throughput per thread = 3141.50 ops/sec
Max throughput per thread = 3282.11 ops/sec
Avg throughput per thread = 3217.70 ops/sec
Min xfer = 501956.00 ops
Children see throughput for 8 stride readers = 1434.73 ops/sec
Parent sees throughput for 8 stride readers = 1434.71 ops/sec
Min throughput per thread = 122.51 ops/sec
Max throughput per thread = 297.87 ops/sec
Avg throughput per thread = 179.34 ops/sec
Min xfer = 215638.00 ops
Children see throughput for 8 random readers = 529.83 ops/sec
Parent sees throughput for 8 random readers = 529.83 ops/sec
Min throughput per thread = 55.63 ops/sec
Max throughput per thread = 101.03 ops/sec
Avg throughput per thread = 66.23 ops/sec
Min xfer = 288717.00 ops
Children see throughput for 8 mixed workload = 352.39 ops/sec
Parent sees throughput for 8 mixed workload = 147.72 ops/sec
Min throughput per thread = 19.24 ops/sec
Max throughput per thread = 72.45 ops/sec
Avg throughput per thread = 44.05 ops/sec
Min xfer = 139211.00 ops
Children see throughput for 8 random writers = 153.29 ops/sec
Parent sees throughput for 8 random writers = 152.62 ops/sec
Min throughput per thread = 19.08 ops/sec
Max throughput per thread = 19.24 ops/sec
Avg throughput per thread = 19.16 ops/sec
Min xfer = 519969.00 ops
iozone test complete.
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