[gentoo-user] top and/or ps without all the java threads

[gentoo-user] top and/or ps without all the java threads

[Chad Leigh -- Shire.Net LLC]

Hi

Is there a way to get a ps or top like display of processes that  
shows just the master process and not all the threads as separate  
processes for java programs?  This is on a 2.4.30 hardened gentoo  
system.

Thanks
Chad

---
Chad Leigh -- Shire.Net LLC
Your Web App and Email hosting provider
chad@shire.net


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Re: [gentoo-user] top and/or ps without all the java threads

[Richard Fish]

Chad Leigh -- Shire.Net LLC wrote:

> Hi
>
> Is there a way to get a ps or top like display of processes that  
> shows just the master process and not all the threads as separate  
> processes for java programs?  This is on a 2.4.30 hardened gentoo  
> system.


For 2.4.30, I don't know of any way to do this, because as far as the 
kernel is concerned, every thread really is a separate process.  They 
are just communicating via signals and shared memory.  I think it is 
pretty much impossible for another process like top or ps to figure out 
whether something is a 'thread' or a 'process' with 2.4.

If you use 2.6 and nptl+nptlonly, this is handled automatically.  Notice 
my ps output for thunderbird:

carcharias rjf # ps -A xw -f | grep thunderbird
rjf        978   963  0 07:06 ?        Sl     0:50 
/usr/lib/mozilla-thunderbird/thunderbird-bin -mail

carcharias rjf # ps -A xw -f -L | grep thunderbird
rjf        978   963   978  0    4 07:06 ?        Sl     0:49 
/usr/lib/mozilla-thunderbird/thunderbird-bin -mail
rjf        978   963   982  0    4 07:06 ?        Sl     0:00 
/usr/lib/mozilla-thunderbird/thunderbird-bin -mail
rjf        978   963   984  0    4 07:06 ?        Sl     0:00 
/usr/lib/mozilla-thunderbird/thunderbird-bin -mail
rjf        978   963 14672  0    4 08:38 ?        Sl     0:00 
/usr/lib/mozilla-thunderbird/thunderbird-bin -mail

-Richard

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