[General] Any linux gurus?

[Stephan Henning]

This is a RedHat6 Enterprise install.

I don't think htop has the data I need, but I'll check. I'm not familiar
with ntop and I didn't consider using trace for this, I'll check that as
well.

The goal is to record read/write rates and block sizes. I'm pretty sure I
am bottlenecking against the drive array, I'm hoping I can get some
definitive answers from this.


On Wed, Dec 11, 2013 at 6:01 PM, David <ainut at knology.net> wrote:

>  ntop might do the trick, but not available in Fedora.
>
>
>
> David wrote:
>
> Can 'htop' show open files?
>
> For intensive live net data, look at WireShark for linux.
>
>
> David wrote:
>
> If that's what you're looking for, there are several (free) programs you
> could run from the command line in a separate window/screen while your
> program is running that give you all you're asking about.  Sort of an
> equivalent to Winblows "System Explorer."  What flavor or Linux are you
> using?
>
> David M.
>
>
> Devin Boyer wrote:
>
> Try something like "strace -T myapp" or "strace -T -c myapp"; they'll show
> the system calls being made and the amount of time spent in each.  It's
> slightly different information than iostat, but it may be useful in
> figuring out what and where your program is performing io access.
>
>
> On Wed, Dec 11, 2013 at 3:37 PM, Stephan Henning <shenning at gmail.com>wrote:
>
>>   No, iostat will normally just dump to the terminal window, but I'd
>> like to pipe it's output to a file so I can parse it later.
>>
>>  My end goal here is to be able to generate a log of iostat output while
>> I run this program, I'm trying to determine exactly how hard this program
>> is hitting my harddrive and at what points during it's run does it access
>> the drive the most frequently.
>>
>>  I've done something similar in bash before, but it is rather clunky.
>>
>>  I'll take a look at exec and see if I can use it.
>>
>>
>> On Wed, Dec 11, 2013 at 4:46 PM, David <ainut at knology.net> wrote:
>>
>>>  Do you need to do anything with the results or just need them displayed?
>>> If you need to manipulate the results, consider using Perl,
>>> or if C or C++,
>>> in your 'exec' call, pipe the output to a file, then just read that file
>>> into your program.
>>> Ain't UNIX great?
>>>
>>>
>>> David M.
>>>
>>>
>>> Stephan Henning wrote:
>>>
>>>  I'd like to take some metrics with iostat while I have a specific
>>> program running, is there a way to wrap iostat around another program (it
>>> is called from the command line) so that iostat ends when the program
>>> finishes running?
>>>
>>>  I know I can do it with a bash script, but I'm hoping for a more
>>> elegant solution.
>>>
>>>
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