If you do indeed have DDR infiniband, then your ib_write_bw tests are
achieving fairly close to the maximum possible throughput of
2gigabytes/second. As far as where your bottleneck lies, my guess is
within the storage connected to your OSSs. What are you using for back-
end storage?
On Jan 1, 2010, at 1:02 AM, lakshmana swamy wrote:
Iam Sorry,
It is DDR not QDR...but still which is the bottleneck
Thank you
laxman
Date: Thu, 31 Dec 2009 12:12:40 -0500
Subject: Re: [Lustre-discuss] max write speed of QDR HCA card
From: [email protected]
To: [email protected]
CC: [email protected]; [email protected]
Are you sure the IB card is connected at QDR rate?
ibstat will tell you. Look at the "Rate" line.
What kind of machines are you using?
ibstat
CA 'mlx4_0'
CA type: MT26428
Number of ports: 2
Firmware version: 2.6.0
Hardware version: a0
Node GUID: 0x00212800013e5432
System image GUID: 0x00212800013e5435
Port 1:
State: Active
Physical state: LinkUp
Rate: 40
Base lid: 13
LMC: 0
SM lid: 2
Capability mask: 0x02510868
Port GUID: 0x00212800013e5433
Port 2:
State: Active
Physical state: LinkUp
Rate: 40
Base lid: 14
LMC: 0
SM lid: 2
Capability mask: 0x02510868
Port GUID: 0x00212800013e5434
On Thu, Dec 31, 2009 at 2:04 AM, lakshmana swamy <[email protected]
> wrote:
ThanQ Atul
I have done the following test, According to the below test, it
reaching 1869.74 MB/sec.
This is the command I used for benchmarking.
# mpiexec -machinefile machs1 -np 1024 IOR -N 1024 -a MPIIO -t 1024K
-b 1G -F -v -o /mnt/file1
Max Write: 421.31 MiB/sec (441.77 MB/sec)
Max Read: 1029.68 MiB/sec (1079.70 MB/sec)
***
1. In the aboove command I used MPIIO with 1024 process, I got the
almost same result when I fired same command with 512 process
2. I tested with stripe and without stripe with both the apis MPIIO
and POSIX
**
node0:~ # ib_write_bw
------------------------------------------------------------------
RDMA_Write BW Test
Number of qp's running 1
Connection type : RC
Each Qp will post up to 100 messages each time
Inline data is used up to 1 bytes message
local address: LID 0x100, QPN 0x28004e, PSN 0xc17c83 RKey
0x8002d00 VAddr 0x002b5fd9964000
remote address: LID 0x101, QPN 0x240051, PSN 0x5e61e, RKey
0x8002d00 VAddr 0x002ae797667000
Mtu : 2048
------------------------------------------------------------------
#bytes #iterations BW peak[MB/sec] BW average[MB/sec]
node0:~ #
node1:~ # ib_write_bw node0
------------------------------------------------------------------
RDMA_Write BW Test
Number of qp's running 1
Connection type : RC
Each Qp will post up to 100 messages each time
Inline data is used up to 1 bytes message
local address: LID 0x101, QPN 0x240051, PSN 0x5e61e RKey
0x8002d00 VAddr 0x002ae797667000
remote address: LID 0x100, QPN 0x28004e, PSN 0xc17c83, RKey
0x8002d00 VAddr 0x002b5fd9964000
Mtu : 2048
------------------------------------------------------------------
#bytes #iterations BW peak[MB/sec] BW average[MB/sec]
65536 5000 1869.76 1869.74
------------------------------------------------------------------
node1:~ #
Date: Thu, 31 Dec 2009 17:43:44 +1100
From: [email protected]
Subject: Re: [Lustre-discuss] max write speed of QDR HCA card
To: [email protected]
CC: [email protected]
Hi Lakshmana,
You can use standard ofed tools like ib_rdma_bw to check Infiniband
bandwidth between pair of nodes.
Lustre provides lnet selftest tool for measuring IB bandwidth
between pair or group of nodes. Check lustre manual for how tos.
Finally, can you post IOR parameters you are using?
Cheers,
Atul
Sent from my iPhone
On Dec 31, 2009, at 5:13 PM, lakshmana swamy
<[email protected]> wrote:
Dear All,
Whats the maximum write speed can be achieved with Infiniband QDR
HCA card.
The Question arised from my lustre setup where Iam not able to
exceed 500MB/s (write speed) with two OSSs and one MDS
Each OSS has four OSTs and one HCA card. I would like to know which
is the bottleneck here.
I have been using IOR for benchmarking
Thank you
LakshmaN
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