[lug] lsof

[Jonathan Eidsness]

You can speed up lsof by narrowing its scope with the -p flag

On Sat, Apr 14, 2018, 12:56 PM Matt James <matuse at gmail.com> wrote:

> I'm not sure if it will be helpful or not - but there are number of dtrace
> scripts on OSX that help with file IO.  I've used opensnoop to debug what
> is chugging away on my disk.  Maybe something in here will be useful:
>
> http://aplawrence.com/MacOSX/opensnoop.html
>
> https://coderwall.com/p/3-8xtw/instead-of-lsof-fs_usage-or-ps-use-the-dtrace-based-opensnoop
>
> Matt
>
> On Sat, Apr 14, 2018 at 11:54 AM, George S. <georges at mhsoftware.com>
> wrote:
>
>>
>>
>> On 4/13/2018 1:50 PM, Jeffrey S. Haemer wrote:
>>
>> Folks,
>>
>> I was going to ask last night at the BLUG meeting but ....
>>
>> First, a confession: this isn't just a Linux question, it's a "difference
>> between OSX and Linux" question. If you never use Macs, you'll probably
>> neither know nor care about the answer.
>>
>> I've been testing a FUSE filesystem.  One test I wrote behaved oddly on
>> OSX 10.13.4.
>> Investigation revealed the command biting me: lsof.
>>
>> On Linux, lsof, which reports whether someone's got a file open, returns
>> instantly.  On 10.13.4, it returns in 10 seconds or so.  It gets the right
>> answer, but verrrrrryyyyy sllllllllllllowwwwly. Before you suggest I try
>> fuser, I'll tell you it has the same problem.
>>
>>
>> Just running lsof with no arguments takes around seconds 51 seconds on my
>> 8 core machine. That's around 440 processes, around half of which are
>> PostgreSQL. One (thread/fork) instance of PostgreSQL has around 180 files
>> open.
>>
>> So, it seems to be somewhat sensitive to how many processes you have and
>> the number of files a process has.
>>
>>
>>
>> Can anyone either tell me how to make this work again, or what I could
>> use instead? My normal help desk -- Google -- didn't come through for me
>> this time.
>>
>> --
>> Jeffrey Haemer <jeffrey.haemer at gmail.com>
>> 720-837-8908 [cell], @goyishekop [twitter]
>> *פרייהייט? דאס איז יאַנג דינען וואָרט!*
>>
>>
>> _______________________________________________
>> Web Page:  http://lug.boulder.co.us
>> Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
>> Join us on IRC: irc.hackingsociety.org port=6667 channel=#hackingsociety
>>
>>
>> --
>> George S.
>> *MH Software, Inc.*
>> Voice: 303 438 9585
>> http://www.mhsoftware.com
>>
>> _______________________________________________
>> Web Page:  http://lug.boulder.co.us
>> Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
>> Join us on IRC: irc.hackingsociety.org port=6667 channel=#hackingsociety
>>
>
> _______________________________________________
> Web Page:  http://lug.boulder.co.us
> Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
> Join us on IRC: irc.hackingsociety.org port=6667 channel=#hackingsociety
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lug.boulder.co.us/pipermail/lug/attachments/20180414/a41f6e7d/attachment.html>