Re: htop vs ps

[Hugo Vanwoerkom <hvw59601@care2.com>]

Camaleón wrote:
> On Fri, 11 Feb 2011 09:25:31 -0600, Hugo Vanwoerkom wrote:
>
> > Camaleón wrote:
>  
> > > You can also make use of the switches of "htop" like "s" to strace the
> > > misterious process :-?
> > I asked on the apcupsd mailing list and it is normal for apcupsd to show
> > that extra PID. Mysql does the same: htop shows 13 PID's and 'ps -Al'
> > shows 2!
> >
> > But noone said 'why' that is so...
>
> Well, according to "man ps" -section "notes"- this utility reads the 
> processes listed under /proc so if there is no such a process in there, 
> "ps" will not list it.
>
> Question then is what kind of PID is listing htop :-?
>
> (searching...)
>
> Oh, okay :-)
>
> Why does htop show lots of apache2 processes by ps aux doesn't?
> http://serverfault.com/questions/24198/why-does-htop-show-lots-of-apache2-processes-by-ps-aux-doesnt

Except that the -H option of ps does *not* show the child PID's:

/sda7/hda10/backup.files/fromhd/home/hugo/gpc-qt4-002-1Fri Feb 
11-11:47:39SDA6# ps -HAl|grep apcupsd
1 S     0  2570     1  0 100   0 - 11586 -      ?        00:00:24   apcupsd
/sda7/hda10/backup.files/fromhd/home/hugo/gpc-qt4-002-1Fri Feb 
11-11:47:44SDA6# ps -HAl|grep mysql
0 S     0  1732     1  0 100   0 -   692 -      ?        00:00:00 
mysqld_safe
4 S   105  1771  1732  0 100   0 - 32081 -      ?        00:00:02     mysqld

Hugo