Re: [lustre-discuss] LNET Self-test

[Patrick Farrell]

Doug,


It seems to me that's not true any more, with larger RPC sizes available.  Is 
there some reason that's not true?


- Patrick


From: lustre-discuss  on behalf of 
Oucharek, Doug S 
Sent: Sunday, February 5, 2017 3:18:10 PM
To: Jeff Johnson
Cc: lustre-discuss@lists.lustre.org
Subject: Re: [lustre-discuss] LNET Self-test

Yes, you can bump your concurrency.  Size caps out at 1M because that is how 
LNet is setup to work.  Going over 1M size would result in an unrealistic 
Lustre test.

Doug

> On Feb 5, 2017, at 11:55 AM, Jeff Johnson  
> wrote:
>
> Without seeing your entire command it is hard to say for sure but I would 
> make sure your concurrency option is set to 8 for starters.
>
> --Jeff
>
> Sent from my iPhone
>
>> On Feb 5, 2017, at 11:30, Jon Tegner  wrote:
>>
>> Hi,
>>
>> I'm trying to use lnet selftest to evaluate network performance on a test 
>> setup (only two machines). Using e.g., iperf or Netpipe I've managed to 
>> demonstrate the bandwidth of the underlying 10 Gbits/s network (and 
>> typically you reach the expected bandwidth as the packet size increases).
>>
>> How can I do the same using lnet selftest (i.e., verifying the bandwidth of 
>> the underlying hardware)? My initial thought was to increase the I/O size, 
>> but it seems the maximum size one can use is "--size=1M".
>>
>> Thanks,
>>
>> /jon
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Re: [lustre-discuss] LNET Self-test

[Oucharek, Doug S]

Yes, you can bump your concurrency.  Size caps out at 1M because that is how 
LNet is setup to work.  Going over 1M size would result in an unrealistic 
Lustre test.

Doug

> On Feb 5, 2017, at 11:55 AM, Jeff Johnson  
> wrote:
> 
> Without seeing your entire command it is hard to say for sure but I would 
> make sure your concurrency option is set to 8 for starters. 
> 
> --Jeff
> 
> Sent from my iPhone
> 
>> On Feb 5, 2017, at 11:30, Jon Tegner  wrote:
>> 
>> Hi,
>> 
>> I'm trying to use lnet selftest to evaluate network performance on a test 
>> setup (only two machines). Using e.g., iperf or Netpipe I've managed to 
>> demonstrate the bandwidth of the underlying 10 Gbits/s network (and 
>> typically you reach the expected bandwidth as the packet size increases).
>> 
>> How can I do the same using lnet selftest (i.e., verifying the bandwidth of 
>> the underlying hardware)? My initial thought was to increase the I/O size, 
>> but it seems the maximum size one can use is "--size=1M".
>> 
>> Thanks,
>> 
>> /jon
>> ___
>> lustre-discuss mailing list
>> lustre-discuss@lists.lustre.org
>> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
> ___
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> lustre-discuss@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org

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Re: [lustre-discuss] LNET Self-test

[Jeff Johnson]

Without seeing your entire command it is hard to say for sure but I would make 
sure your concurrency option is set to 8 for starters. 

--Jeff

Sent from my iPhone

> On Feb 5, 2017, at 11:30, Jon Tegner  wrote:
> 
> Hi,
> 
> I'm trying to use lnet selftest to evaluate network performance on a test 
> setup (only two machines). Using e.g., iperf or Netpipe I've managed to 
> demonstrate the bandwidth of the underlying 10 Gbits/s network (and typically 
> you reach the expected bandwidth as the packet size increases).
> 
> How can I do the same using lnet selftest (i.e., verifying the bandwidth of 
> the underlying hardware)? My initial thought was to increase the I/O size, 
> but it seems the maximum size one can use is "--size=1M".
> 
> Thanks,
> 
> /jon
> ___
> lustre-discuss mailing list
> lustre-discuss@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
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Re: [lustre-discuss] LNET Self-test

[Raj]

You should be able to do concurrent streams using --concurrency option. I
would try with 2/4/8.
-RG

On Sun, Feb 5, 2017 at 1:30 PM Jon Tegner  wrote:

> Hi,
>
> I'm trying to use lnet selftest to evaluate network performance on a
> test setup (only two machines). Using e.g., iperf or Netpipe I've
> managed to demonstrate the bandwidth of the underlying 10 Gbits/s
> network (and typically you reach the expected bandwidth as the packet
> size increases).
>
> How can I do the same using lnet selftest (i.e., verifying the bandwidth
> of the underlying hardware)? My initial thought was to increase the I/O
> size, but it seems the maximum size one can use is "--size=1M".
>
> Thanks,
>
> /jon
> ___
> lustre-discuss mailing list
> lustre-discuss@lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>
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[lustre-discuss] LNET Self-test

[Jon Tegner]

Hi,

I'm trying to use lnet selftest to evaluate network performance on a 
test setup (only two machines). Using e.g., iperf or Netpipe I've 
managed to demonstrate the bandwidth of the underlying 10 Gbits/s 
network (and typically you reach the expected bandwidth as the packet 
size increases).


How can I do the same using lnet selftest (i.e., verifying the bandwidth 
of the underlying hardware)? My initial thought was to increase the I/O 
size, but it seems the maximum size one can use is "--size=1M".


Thanks,

/jon
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