[lustre-discuss] "tag" feature of ltop

Alexander I Kulyavtsev aik at fnal.gov
Thu May 21 16:25:56 PDT 2015


As you said in earlier mail, when I sort by IO rate, locks, etc., selected OST are jumping around or just in different rows as seen below.

Anyway, this is not strong desire in the long term: I may feed cerebro output to the web page.

Best regards, Alex.

On May 21, 2015, at 5:42 PM, Faaland, Olaf P. <faaland1 at llnl.gov<mailto:faaland1 at llnl.gov>> wrote:

Alexander,

Thanks for your reply.

ltop also lets you sort by OSS, so that the OSTs sharing an OSS are all next to each other.  Do you find tagging more helpful than that?

Olaf P. Faaland
LLNL
________________________________
From: Alexander I Kulyavtsev [aik at fnal.gov<mailto:aik at fnal.gov>]
Sent: Thursday, May 21, 2015 2:59 PM
To: Faaland, Olaf P.
Cc: Alexander I Kulyavtsev; lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] "tag" feature of ltop

It may have sense to keep tagging.

I marked OSS dslustre15 and then switched to OST view.  I have all OSTs on marked OSS highlighted:

005c F dslustre13  1016    0     1     0     1    6503    0    0    1   95   80
005d F dslustre14  1016    0     0     0     0    7472    0    0    1   95   79
005e F dslustre13  1016    0     0     0     0    8880    0    0    1   95   75
005f F dslustre14  1016    0     0     0     0    7161    0    0    1   95   77
0060 F dslustre15  1016    0     0     0     0    7478    0    0   48   96   76
0061 F dslustre16  1016    0     0     0     0    7543    0    0    1   96   78
0062 F dslustre15  1016    0     0     0     0    6907    0    0   48   96   78
0063 F dslustre16  1016    0     0     0     0    7410    0    0    1   96   75
0064 F dslustre15  1016    0     0     0     0    6113    0    0   48   96   80
0065 F dslustre16  1016    0     0     0     0    6833    0    0    1   96   78
0066 F dslustre15  1016    0     1     0     1    6545    0    0   48   96   78
0067 F dslustre16  1016    0     1     0     1    7190    0    0    1   96   78

I was about to say 'we do not use it' yesterday; tracking some issue today.
Thanks, ALex.


On May 18, 2015, at 7:29 PM, Faaland, Olaf P. <faaland1 at llnl.gov<mailto:faaland1 at llnl.gov>> wrote:

Hello,

I am working on updating ltop, the text client within LMT (https://github.com/chaos/lmt/wiki).  I am adding support for DNE (multiple active MDT's within a single filesystem).

In the interesting of keeping the tool free of cruft, I am asking the community about their usage.

Currently, ltop allows for the user to "tag" an OST or an OSS, which causes the row(s) for that OSS (or OST's on that OSS) to be underlined so that they stand out visually.  Presumably this is so that one can follow an OST as it bounces around the table, when the table is sorted by something that changes dynamically like CPU usage or lock count.

Does anyone use this feature?  The first few people I polled do not use it, but if others use it I will extend it to the MDT's.  If no one uses it, then I'll remove it entirely.

Thanks,

Olaf P. Faaland
Livermore Computing
Lawrence Livermore National Lab
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