Hi Andrey,
Changing sector to 4k is easy, this can really help. see DCT manual, it’s there.
This can be relevant for you https://itpeernetwork.intel.com/how-to-configure-oracle-redo-on-the-intel-pcie-ssd-dc-p3700/
After overcoming my issues with isdct, and reformatting the NVMes to 4k
sector size, success!
9.5 mio IOPS =)
This is another 34% faster than before.
So: thanks a bunch for your tip!
Cheers,
/Tobias
Next steps:
- approach MD developers about bottlenecks there
- approach PostgreSQL about using pread/pwrite (instead of lseek/read/write)
randread-individual-nvmes: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K,
ioengine=libaio, iodepth=128
...
fio-2.1.11
Starting 128 threads
Jobs: 128 (f=2048): [r(128)] [100.0% done] [37244MB/0KB/0KB /s]
[9534K/0/0 iops] [eta 00m:00s]
randread-individual-nvmes: (groupid=0, jobs=128): err= 0: pid=25406: Tue
Jan 24 15:57:19 2017
read : io=1083.9GB, bw=36964MB/s, iops=9462.8K, runt= 30026msec
cpu : usr=9.00%, sys=77.01%, ctx=49252920, majf=0, minf=16512
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