Re: Defunct Processes

Thanks Matt for your inputs..I am now discussing this with our apps devs.
Thanks! :-)

On 10/26/06, Matt Dew <[email protected]> wrote:
>
> Ej,
>   I have something tangentially related for you.  Openmosix programs
> work best when system calls are kept to a minimum.  File I/O, getting
> the time, dropping privileges, malloc, etc are all 'expensive'
> operations.   If you have file I/O, read/write as much as you can
> into/from memory at one time and then do everything else in arrays or
> memory structures.
>
> I know of one program, ngspice, which kept file io to a minimum but
> periodically checked the system time so it could track how long
> something was taking.  We found this out by using strace.  We rewrote
> the program and removed the time() calls and the program execution time
> (during migration) was reduced, I'm not exaggerating,  by two orders of
> magnitude.
>
> Matt
>
> On Wed, 2006-10-25 at 06:49 +0000, "ej magpayo"  wrote:
> > I have a few questions about openmosix. I'm not sure if you will
> > answer this email or not because I know you guys are very busy.
> > Anyway, I just want to clear some things so here it goes, I am a Sysad
> > working for Wolfpac Mobile Inc, I implemented openmosix on 4 IBM x336
> > running on dual core(2) , OS Centos 3.7, 2.4.24 kernel,
> > openMosix-2.4.24-2. My servers are currently running our Mobile apps
> > which are mostly written on perl, C  and java scripts. The scripts
> > only run on one server and then uses the other 3's resources but
> > according to mmon, the openmosix kernel is not distributing the
> > processes. One of the main problem here is that all the applications
> > running on the server will suddenly become "defunct" processes and
> > after a few days of uptime, then the server's system processes will
> > become defunct as well. What plan of action should I take for this?
> > Should I inform the our developers to review openmosix and make thier
> > codes cluster-aware? I booted the server to the default kernel of
> > Centos to avoid downtime for the meantime.
> >
> > regards,
> > --
> > E J  M A G P A Y O
> > Sr. Technical Applications Systems Administrator
> > Systems & Network Infrastructure
> > WOLFPAC MOBILE, INC.
> > http://www.wolfpac.net
> > phone: +63-2-897-6756/63-2-899-3177
> > mobile: +63-920-952-4695
> > --------------------------------------------------------------------
> > "Music is the answer.." -- Danny Tenaglia
> >
>
>

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