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ATOP can be used without kernel-patches. In that case no
information is available about the disk- and network-traffic on a
per-process basis. This means a.o. that the selection 'd' (show
disk-transfers per process) and 'n' (show network-transfers per
process) can not be used, and the columns shown in the generic
screen are different.
Two kernel-patches are delivered for ATOP:
XXX-atopcnt
This patch takes care that statistical counters are added
to the process-administration (task_struct) and that these
counters are incremented per process.
The additional counters are shown via the process'
/proc/PID/stat file as a second line of counters.
The meaning of these counters:
- disk read transfers
- disk accumulated number of sectors read
- disk write transfers
- disk accumulated number of sectors written
- tcp send requests
- tcp accumulated number of bytes transmitted
- tcp receive requests
- tcp accumulated number of bytes received
- udp send requests
- udp accumulated number of bytes transmitted
- udp receive requests
- udp accumulated number of bytes received
- raw send requests (e.g. echo requests by ping)
- raw receive requests
When this patch is installed, ATOP automatically shows
another layout for the generic screen (including disk-
and network-transfers for active processes). However for
terminated process these additional counters are not shown,
because the conventional layout of the process-accounting
record has not been adapted.
XXX-atopacct
This patch takes care that the additional statistical
counters are added to the process-accounting record (yes,
this means an incompatible layout of this record).
Notice that this patch is an extension of the XXX-atopcnt
patch! This patch can not be installed on its own.
When this patch is installed, ATOP automatically shows
the additional counters for terminated processes as well.
Since the pid of processes is also stored in the modified
process-accounting record, matching this info with the
formerly running process is less time-consuming compared to
the conventional process-accounting record.
The following steps are needed to install these patches:
1. Take care that the kernel-sources are installed
(as a subdirectory of /usr/src).
2. Make a copy of the directory-tree with original kernel-sources
to a new tree under /usr/src.
3. Make a symbolic link with the name /usr/src/linux referring to the
copied tree. This tree will be modified with the patch(es).
4. Start the command to patch the new tree while you remain in the
directory /usr/src.
Example for kernel-version 2.6.8:
patch -p0 < 01patch-2.6.8_atopcnt
patch -p0 < 02patch-2.6.8_atopacct
This will modify the kernel-sources under /usr/src/linux.
5. Build a new kernel and reboot.
When the patch ..._atopacct has been installed, take care that
the current process-accounting file (filled with the old
record-layout till now) is removed. This is only relevant when
your system permanently logs process-accounting records triggered
by the file /etc/logrotate.d/psacct. Thus if this file is present,
issue the following commands after you rebooted your system:
/usr/sbin/accton # switch off accounting
> /var/account/pacct # empty accounting file
/usr/sbin/accton /var/account/pacct # switch on accounting
Disclaimer:
The authors deny any warranty for any data loss and damage whatsoever
that may be caused directly or indirectly by using this software.
This is experimental software. Use at your own risk.
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