Re: hello

> Date: Thu, 1 May 2003 13:47:55 +0200
> From: "Eugen" <eugen <at> iqnet.ro>
> To: procps-bugs <at> redhat.com

Could you post as Text and not use HTML ?
The admin should be telling this to you but seems this
list is a free for all. 

arun

Signal 17 problem with ps command

Floating point exception: top -d0

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Bug report

'ps -C name' without -m shows all threads of the process ?

We have multithreaded process with number of threads
between 20 and 60 [and changing sometimes]. This is RedHat 8.

Suddenly out of blue, 'ps -C OurprOc' started
to show all threads of the process instead of 1 line.

'ps -l -C xxx' also showed many lines -- 1 per thread
-- although expected to show 1 line only. Looking at PPIDs
in 'ps -l -C xxx' -- it's definitely all threads of a single process.

Then, 10 minutes after, 'ps -C OurprOc' reverted
to normal: showing 1 line. There is no alias of ps to 'ps -m'
or like. The process was not even restarted, same pid. It has now
74 threads.

BTW: when ps showed incorrect output, the system was highly loaded,
and when ps reverted to normal, the load subsided. I don't know
it it's related.

Is this known bug in ps ?

--

-- 
Jacob Lerner

      % echo 'scale=80; a(1)*4' | bc -l
--

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Re: 'ps -C name' without -m shows all threads of the process ?

On Mon, 5 May 2003, Yakov Lerner wrote:

> We have multithreaded process with number of threads
> between 20 and 60 [and changing sometimes]. This is RedHat 8.
> 
> Suddenly out of blue, 'ps -C OurprOc' started
> to show all threads of the process instead of 1 line.
> 
> 'ps -l -C xxx' also showed many lines -- 1 per thread
> -- although expected to show 1 line only. Looking at PPIDs
> in 'ps -l -C xxx' -- it's definitely all threads of a single process.
> 
> Then, 10 minutes after, 'ps -C OurprOc' reverted
> to normal: showing 1 line. There is no alias of ps to 'ps -m'
> or like. The process was not even restarted, same pid. It has now
> 74 threads.
> 
> BTW: when ps showed incorrect output, the system was highly loaded,
> and when ps reverted to normal, the load subsided. I don't know
> it it's related.
> 
> Is this known bug in ps ?

The way thread grouping is done in RH8 is sort of hacky. it compares the 
names and vm sizes of children. Since /proc reading is not atomic it is 
possible that e.g. the vm size of a child thread changes inbetween reading 
the parent and child data, this would cause problems like this. This is 
also more likely to happen during high load.

In the future NPTL will solve this since we then have a threadgroup id.

--

-- 
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