Apache::VMonitor -- The Visual System and Apache Server Monitor Page 4

Now you need to specify which processes are to be monitored. The regular expression that will match the desired processes is required for this section to work. For example if you want to see all the processes whose name include any of these strings: http, mysql and squid, the following regular expression is to be used:

  ::VMonitor::PROC_REGEX = join "\|", qw(httpd mysql squid);

mount(1) Emulation
This section reports about mounted filesystems, the same way as if you have called mount(1) with no parameters.

If you want the mount(1) section to be displayed set:

  ::VMonitor::Config{MOUNT} = 1;

The default is NOT to display this section.

df(1) Emulation
This section completely reproduces the df(1) utility. For each mounted filesystem it reports the number of total and available blocks (for both superuser and user), and usage in percents.

In addition it reports about available and used file inodes in numbers and percents.

This section has a capability of visual alert which is being triggered when either some filesystem becomes more than 90% full or there are less than 10% of free file inodes left. When this event happens the filesystem related report row will be displayed in the bold font and in the red color. A mount point directory will blink if the blinking is turned on. You can turn the blinking on with:

  ::VMonitor::Config{BLINKING} = 1;

If you don't want the df(1) section to be displayed set:

  ::VMonitor::Config{FS_USAGE} = 0;

The default is to display this section.

for more than 90% and therefore colored in red. (It's normal for /mnt/cdrom, which is a mounted cdrom, but critical for the /usr filesystem which should be cleaned up or enlarged).

abbreviations and hints
The report uses many abbreviations, which might be knew for you. If you enable the VERBOSE mode with:

  ::VMonitor::Config{VERBOSE} = 1;

this section will reveal all the full names of the abbreviations at the bottom of the report.

The default is NOT to display this section.

A Single Process Extensive Reporting System

If you need to get an in-depth information about a single process, you just need to click on its PID.

If the chosen process is a mod_perl process, the following info is displayed:

  • Process type (child or parent), status of the process (Starting, Reading, Sending, Waiting, etc.), how long the current request is processed or the last one was processed if the process is inactive at the moment of the report take.

  • How many bytes transferred so far. How many requests served per child and per slot.

  • CPU times used by process: total, utime, stime, cutime, cstime.

For all (mod_perl and non-mod_perl) processes the following information is reported:

  • General process info: UID, GID, State, TTY, Command line arguments

  • Memory Usage: Size, Share, VSize, RSS

  • Memory Segments Usage: text, shared lib, date and stack.

  • Memory Maps: start-end, offset, device_major:device_minor, inode, perm, library path.

  • Loaded libraries sizes.

This article was originally published on Dec 27, 2000

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