Question: BlockSize > 8192 with FusionIO

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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@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@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@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%

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