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Performance tuning of Connect:Direct (NDM)

 
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avik

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Joined: 13 May 2008
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Location: kolkata

PostPosted: Fri May 23, 2008 12:30 pm    Post subject: Performance tuning of Connect:Direct (NDM)
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We're using Connect:Direct (NDM) for data transfer between different LPARs. A lot of CPU consumption happens for NDM processes. So I have searched a lot regarding tuning options of Connect:Direct. But didn't get much about it.

I know Connect:Direct is already a tuned proccess. So are there any other suggestions for tuning Connect:Direct?
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Fri May 23, 2008 10:29 pm    Post subject:
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Hello,

File transfers usually do not consume excessive cpu.

Does this process use compression?
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superk

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Joined: 26 Apr 2004
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Location: Raleigh, NC, USA

PostPosted: Fri May 23, 2008 10:35 pm    Post subject: Reply to: Performance tuning of Connect:Direct (NDM)
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FWIW, there's a similar topic of discussion on the IBM-MAIN LISTSERV that might be worth investigating:

http://groups.google.com/group/bit.listserv.ibm-main/browse_frm/thread/a111628a55cbfea0?hl=en#
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avik

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PostPosted: Mon May 26, 2008 11:34 am    Post subject:
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Is there any guidelines for getting optimal performance for NDM in z/os?
Example-what should be the "VEL" or "IMP" parameters?
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avik

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PostPosted: Sun Jun 08, 2008 1:31 pm    Post subject:
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Hi all,
In proclib of NDM I found out many procs containing "Compression" on.So the jobname in my JCLlib having those procs are using "Compression on" while running.
Can anyone help me out that how to make the compression outside NDM & then sending the data through it. icon_rolleyes.gif
If I am compressing data outside NDm through any job(JCL) the is that going to give me benefit or not?
Also how to check for "velocity" & region size" & other parameters for NDM???
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enrico-sorichetti

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PostPosted: Sun Jun 08, 2008 1:45 pm    Post subject: Reply to: Performance tuning of Connect:Direct (NDM)
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Quote:
If I am compressing data outside NDm through any job(JCL) the is that going to give me benefit or not?


compression and decompression are CPU intensive processes,
so it is irrelevant at what stage You perform it, CPU consumption will be there
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dick scherrer

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PostPosted: Sun Jun 08, 2008 11:16 pm    Post subject:
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Hello,

Quote:
compression and decompression are CPU intensive processes,
. . ., CPU consumption will be there


Depending on which compression tool you use and the content of the data to be compressed, one may use a bit more or less than the other. To find out, run some tests.

As Enrico mentioned, compression is CPU intensive, so someone will need to decide if it is preferable to use more CPU or transmit a larger volume.
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