21.4.30 ndb_top — View CPU usage information for NDB threads
ndb_top displays running information in the terminal about CPU usage by NDB threads on an NDB Cluster data node. Each thread is represented by two rows in the output, the first showing system statistics, the second showing the measured statistics for the thread.
ndb_top is available beginning with MySQL NDB Cluster 7.6.3.
Usage
ndb_top [-h hostname] [-t port] [-u user] [-p pass] [-n node_id]
ndb_top connects to a MySQL Server running as an SQL node of the cluster. By default, it attempts to connect to a mysqld running on localhost
and port 3306, as the MySQL root
user with no password specified. You can override the default host and port using, respectively, --host
(-h
) and --port
(-t
). To specify a MySQL user and password, use the --user
(-u
) and --passwd
(-p
) options. This user must be able to read tables in the ndbinfo
database (ndb_top uses information from ndbinfo.cpustat
and related tables).
For more information about MySQL user accounts and passwords, see Section 6.2, “Access Control and Account Management”.
Output is available as plain text or an ASCII graph; you can specify this using the --text
(-x
) and --graph
(-g
) options, respectively. These two display modes provide the same information; they can be used concurrently. At least one display mode must be in use.
Color display of the graph is supported and enabled by default (--color
or -c
option). With color support enabled, the graph display shows OS user time in blue, OS system time in green, and idle time as blank. For measured load, blue is used for execution time, yellow for send time, red for time spent in send buffer full waits, and blank spaces for idle time. The percentage shown in the graph display is the sum of percentages for all threads which are not idle. Colors are not currently configurable; you can use grayscale instead by using --skip-color
.
The sorted view (--sort
, -r
) is based on the maximum of the measured load and the load reported by the OS. Display of these can be enabled and disabled using the --measured-load
(-m
) and --os-load
(-o
) options. Display of at least one of these loads must be enabled.
The program tries to obtain statistics from a data node having the node ID given by the --node-id
(-n
) option; if unspecified, this is 1. ndb_top cannot provide information about other types of nodes.
The view adjusts itself to the height and width of the terminal window; the minimum supported width is 76 characters.
Once started, ndb_top runs continuously until forced to exit; you can quit the program using Ctrl-C
. The display updates once per second; to set a different delay interval, use --sleep-time
(-s
).
ndb_top is available on macOS, Linux, and Solaris. It is not currently supported on Windows platforms.
The following table includes all options that are specific to the NDB Cluster program ndb_top. Additional descriptions follow the table.
Table 21.263 Command-line options for the ndb_top program
Format | Description | Added, Deprecated, or Removed |
---|---|---|
Show ASCII graphs in color; use --skip-colors to disable | ADDED: NDB 7.6.3 |
|
Display data using graphs; use --skip-graphs to disable | ADDED: NDB 7.6.3 |
|
Show program usage information | ADDED: NDB 7.6.3 |
|
Host name or IP address of MySQL Server to connect to | ADDED: NDB 7.6.3 |
|
Show measured load by thread | ADDED: NDB 7.6.3 |
|
Watch node having this node ID | ADDED: NDB 7.6.3 |
|
Show load measured by operating system | ADDED: NDB 7.6.3 |
|
Connect using this password (same as --password option) | ADDED: NDB 7.6.3 REMOVED: NDB 7.6.4 |
|
Connect using this password | ADDED: NDB 7.6.6 |
|
|
Port number to use when connecting to MySQL Server | ADDED: NDB 7.6.3 |
Time to wait between display refreshes, in seconds | ADDED: NDB 7.6.3 |
|
Socket file to use for connection | ADDED: NDB 7.6.6 |
|
Sort threads by usage; use --skip-sort to disable | ADDED: NDB 7.6.3 |
|
|
Display data using text | ADDED: NDB 7.6.3 |
Connect as this MySQL user | ADDED: NDB 7.6.3 |
In NDB 7.6.6 and later, ndb_top also supports the common NDB
program options --defaults-file
, --defaults-extra-file
, --print-defaults
, --no-defaults
, and --defaults-group-suffix
. (Bug #86614, Bug #26236298)
Additional Options
-
Property Value Command-Line Format --color
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value TRUE
Show ASCII graphs in color; use
--skip-colors
to disable. -
Property Value Command-Line Format --graph
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value TRUE
Display data using graphs; use
--skip-graphs
to disable. This option or--text
must be true; both options may be true. -
Property Value Command-Line Format --help
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value TRUE
Show program usage information.
-
Property Value Command-Line Format --host[=name]
Introduced 5.7.19-ndb-7.6.3 Type String Default Value localhost
Host name or IP address of MySQL Server to connect to.
-
Property Value Command-Line Format --measured-load
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value FALSE
Show measured load by thread. This option or
--os-load
must be true; both options may be true. -
Property Value Command-Line Format --node-id[=#]
Introduced 5.7.19-ndb-7.6.3 Type Integer Default Value 1
Watch the data node having this node ID.
-
Property Value Command-Line Format --os-load
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value TRUE
Show load measured by operating system. This option or
--measured-load
must be true; both options may be true. -
Property Value Command-Line Format --passwd[=password]
Introduced 5.7.19-ndb-7.6.3 Removed 5.7.20-ndb-7.6.4 Type Boolean Default Value NULL
Connect using this password.
This option is deprecated in NDB 7.6.4. It is removed in NDB 7.6.6, where it is replaced by the
--password
option. (Bug #26907833) -
Property Value Command-Line Format --password[=password]
Introduced 5.7.22-ndb-7.6.6 Type Boolean Default Value NULL
Connect using this password.
This option was added in NDB 7.6.6 as a replacement for the
--passwd
option used previously. (Bug #26907833) --port[
=#]
,-t
(NDB 7.6.6 and later:-P
)Property Value Command-Line Format --port[=#]
Introduced 5.7.19-ndb-7.6.3 Type Integer Default Value 3306
Port number to use when connecting to MySQL Server.
Beginning with NDB 7.6.6, the short form for this option is
-P
, and-t
is repurposed as the short form for the--text
option. (Bug #26907833)-
Property Value Command-Line Format --sleep-time[=seconds]
Introduced 5.7.19-ndb-7.6.3 Type Integer Default Value 1
Time to wait between display refreshes, in seconds.
-
Property Value Command-Line Format --socket
Introduced 5.7.22-ndb-7.6.6 Type Path name Default Value [none]
Use the specified socket file for the connection.
Added in NDB 7.6.6. (Bug #86614, Bug #26236298)
-
Property Value Command-Line Format --sort
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value TRUE
Sort threads by usage; use
--skip-sort
to disable. --text
,-x
(NDB 7.6.6 and later:-t
)Property Value Command-Line Format --text
Introduced 5.7.19-ndb-7.6.3 Type Boolean Default Value FALSE
Display data using text. This option or
--graph
must be true; both options may be true.Beginning with NDB 7.6.6, the short form for this option is
-t
and support for-x
is removed. (Bug #26907833)-
Property Value Command-Line Format --user[=name]
Introduced 5.7.19-ndb-7.6.3 Type String Default Value root
Connect as this MySQL user.
Sample Output. The next figure shows ndb_top running in a terminal window on a Linux system with an ndbmtd data node under a moderate load. Here, the program has been invoked using ndb_top -n8
-x
to provide both text and graph output: