Question: BlockSize > 8192 with FusionIO

Has anyone had a chance to recompile and try larger a larger blocksize than 8192 with pSQL 8.4.x? I'm finally getting around to tuning some FusionIO drives that we are setting up. We are looking to setup 4 fusionIO drives per server, and then use pgpooler to scale them to 3 servers so that we can scale up to 72 processors. I'm almost done with the configuration to start heavily testing but wanted to know if anyone has really messed with the blocksize options?

If anyone has done load balancing with pgpooler I'd love to hear their experience with it as well. I have attached the randwrite performance test below, as you can see going from 8K -> 32K -> 1M blocksize the drives really start to move.

Thanks,
- John

[v025554(at)athenaash05 /]$ fio --filename=/fusionIO/export1/test1 --size=25G --bs=8k --direct=1 --rw=randwrite --numjobs=8 --runtime=30 --group_reporting --name=file1
file1: (g=0): rw=randwrite, bs=8K-8K/8K-8K, ioengine=sync, iodepth=1
...
file1: (g=0): rw=randwrite, bs=8K-8K/8K-8K, ioengine=sync, iodepth=1
Starting 8 processes
Jobs: 8 (f=8): [wwwwwwww] [100.0% done] [0K/138M /s] [0/17K iops] [eta 00m:00s]
file1: (groupid=0, jobs=8): err= 0: pid=23287
write: io=3,819MB, bw=127MB/s, iops=16,292, runt= 30001msec
clat (usec): min=41, max=1,835K, avg=268.42, stdev=3627.29
bw (KB/s) : min= 4, max=142304, per=15.13%, avg=19714.31, stdev=8364.40
cpu : usr=0.16%, sys=3.13%, ctx=1123544, majf=0, minf=176
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued r/w: total=0/488779, short=0/0
lat (usec): 50=14.81%, 100=58.17%, 250=0.28%, 500=22.33%, 750=3.67%
lat (usec): 1000=0.16%
lat (msec): 2=0.35%, 4=0.09%, 10=0.11%, 20=0.01%, 50=0.01%
lat (msec): 100=0.01%, 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.01%
lat (msec): 2000=0.01%

Run status group 0 (all jobs):
WRITE: io=3,819MB, aggrb=127MB/s, minb=130MB/s, maxb=130MB/s, mint=30001msec, maxt=30001msec

Disk stats (read/write):
md0: ios=0/514993, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
fiod: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioc: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fiob: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioa: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
[v025554(at)athenaash05 /]$ fio --filename=/fusionIO/export1/test1 --size=25G --bs=32k --direct=1 --rw=randwrite --numjobs=8 --runtime=30 --group_reporting --name=file1
file1: (g=0): rw=randwrite, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1
...
file1: (g=0): rw=randwrite, bs=32K-32K/32K-32K, ioengine=sync, iodepth=1
Starting 8 processes
Jobs: 8 (f=8): [wwwwwwww] [100.0% done] [0K/343M /s] [0/11K iops] [eta 00m:00s]
file1: (groupid=0, jobs=8): err= 0: pid=23835
write: io=9,833MB, bw=328MB/s, iops=10,487, runt= 30002msec
clat (usec): min=64, max=227K, avg=349.31, stdev=1517.64
bw (KB/s) : min= 883, max=171712, per=16.25%, avg=54548.49, stdev=13973.76
cpu : usr=0.18%, sys=2.82%, ctx=669138, majf=0, minf=176
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued r/w: total=0/314659, short=0/0
lat (usec): 100=84.14%, 250=8.73%, 500=0.07%, 750=2.45%, 1000=3.19%
lat (msec): 2=0.29%, 4=0.17%, 10=0.22%, 20=0.23%, 50=0.31%
lat (msec): 100=0.13%, 250=0.05%

Run status group 0 (all jobs):
WRITE: io=9,833MB, aggrb=328MB/s, minb=336MB/s, maxb=336MB/s, mint=30002msec, maxt=30002msec

Disk stats (read/write):
md0: ios=0/455522, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
fiod: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioc: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fiob: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioa: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
[v025554(at)athenaash05 /]$ fio --filename=/fusionIO/export1/test1 --size=25G --bs=1M --direct=1 --rw=randwrite --numjobs=8 --runtime=30 --group_reporting --name=file1
file1: (g=0): rw=randwrite, bs=1M-1M/1M-1M, ioengine=sync, iodepth=1
...
file1: (g=0): rw=randwrite, bs=1M-1M/1M-1M, ioengine=sync, iodepth=1
Starting 8 processes
Jobs: 8 (f=8): [wwwwwwww] [100.0% done] [0K/912M /s] [0/890 iops] [eta 00m:00s]
file1: (groupid=0, jobs=8): err= 0: pid=24877
write: io=25,860MB, bw=862MB/s, iops=861, runt= 30004msec
clat (usec): min=456, max=83,766, avg=5599.02, stdev=2026.74
bw (KB/s) : min=28603, max=216966, per=11.93%, avg=105311.22, stdev=10668.06
cpu : usr=0.06%, sys=2.03%, ctx=91888, majf=0, minf=176
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
issued r/w: total=0/25860, short=0/0
lat (usec): 500=12.74%, 750=20.60%, 1000=7.37%
lat (msec): 2=3.12%, 4=6.57%, 10=26.95%, 20=21.37%, 50=1.12%
lat (msec): 100=0.14%

Run status group 0 (all jobs):
WRITE: io=25,860MB, aggrb=862MB/s, minb=883MB/s, maxb=883MB/s, mint=30004msec, maxt=30004msec

Disk stats (read/write):
md0: ios=0/500382, merge=0/0, ticks=0/0, in_queue=0, util=0.00%, aggrios=0/0, aggrmerge=0/0, aggrticks=0/0, aggrin_queue=0, aggrutil=0.00%
fiod: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioc: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fiob: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%
fioa: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=nan%

This communication is for informational purposes only. It is not
intended as an offer or solicitation for the purchase or sale of
any financial instrument or as an official confirmation of any
transaction. All market prices, data and other information are not
warranted as to completeness or accuracy and are subject to change
without notice. Any comments or statements made herein do not
necessarily reflect those of JPMorgan Chase & Co., its subsidiaries
and affiliates.

This transmission may contain information that is privileged,
confidential, legally privileged, and/or exempt from disclosure
under applicable law. If you are not the intended recipient, you
are hereby notified that any disclosure, copying, distribution, or
use of the information contained herein (including any reliance
thereon) is STRICTLY PROHIBITED. Although this transmission and any
attachments are believed to be free of any virus or other defect
that might affect any computer system into which it is received and
opened, it is the responsibility of the recipient to ensure that it
is virus free and no responsibility is accepted by JPMorgan Chase &
Co., its subsidiaries and affiliates, as applicable, for any loss
or damage arising in any way from its use. If you received this
transmission in error, please immediately contact the sender and
destroy the material in its entirety, whether in electronic or hard
copy format. Thank you.

Please refer to http://www.jpmorgan.com/pages/disclosures for
disclosures relating to European legal entities.