[Lustre-discuss] max write speed of QDR HCA card

[lakshmana swamy]

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: erik.froese at gmail.com
To: klakshman03 at hotmail.com
CC: atul.vidwansa at sun.com; lustre-discuss at lists.lustre.org

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 <klakshman03 at hotmail.com> 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: Atul.Vidwansa at Sun.COM
Subject: Re: [Lustre-discuss] max write speed of QDR HCA card
To: klakshman03 at hotmail.com
CC: lustre-discuss at lists.lustre.org





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 <klakshman03 at hotmail.com> 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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