20022013 Ericsson AB. All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. Erlang Top etop_ug.xml
Introduction

Erlang Top, etop is a tool for presenting information about erlang processes similar to the information presented by top in UNIX.

Output

The output from etop looks like this:

code_server 0 59585 78064 0 gen_server:loop/6 <127.21.0> file_server_2 0 36380 44276 0 gen_server:loop/6 <127.2.0> erl_prim_loader 0 27962 3740 0 erl_prim_loader:loop <127.9.0> kernel_sup 0 6998 4676 0 gen_server:loop/6 <127.17.0> net_kernel 62 6018 3136 0 gen_server:loop/6 <127.0.0> init 0 4156 4352 0 init:loop/1 <127.16.0> auth 0 1765 1264 0 gen_server:loop/6 <127.18.0> inet_tcp_dist:accept 0 660 1416 0 prim_inet:accept0/2 <127.5.0> application_controll 0 569 6756 0 gen_server:loop/6 <127.137.0> net_kernel:do_spawn_ 0 553 5840 0 dbg:do_relay_1/1 ======================================================================================== ]]>

The header includes some system information:

Load cpu is Runtime/Wallclock, i.e. the percentage of time where the node has been active, procs is the number of processes on the node, and runq is the number of processes that are ready to run. Memory This is the memory allocated by the node in kilo bytes.

For each process the following information is presented:

Time This is the runtime for the process, i.e. the actual time the process has been scheduled in. Reds This is the number of reductions that has been executed on the process Memory This is the size of the process in bytes, obtained by a call to process_info(Pid,memory). MsgQ This is the length of the message queue for the process.

Time and Reds can be presented as accumulated values or as values since last update.
Start

To start etop use the script etop or the batch file etop.bat, e.g. etop -node tiger@durin,

Configuration

All configuration parameters can be set at start by adding -OptName Value to the command line, e.g. etop -node tiger@durin -setcookie mycookie -lines 15.

The parameters lines, interval, accumulate and sort can be changed during runtime by the function etop:config/2.

A list of all valid configuration parameters can be found in the reference manual for etop.

Example: Change configuration with text based presentation code_server 0 60350 71176 0 gen_server:loop/6 <127.21.0> file_server_2 0 36380 44276 0 gen_server:loop/6 <127.2.0> erl_prim_loader 0 27962 3740 0 erl_prim_loader:loop <127.17.0> net_kernel 0 13808 3916 0 gen_server:loop/6 <127.9.0> kernel_sup 0 6998 4676 0 gen_server:loop/6 <127.0.0> init 0 4156 4352 0 init:loop/1 <127.18.0> inet_tcp_dist:accept 0 2196 1416 0 prim_inet:accept0/2 <127.16.0> auth 0 1893 1264 0 gen_server:loop/6 <127.43.0> ddll_server 0 582 3744 0 gen_server:loop/6 <127.5.0> application_controll 0 569 6756 0 gen_server:loop/6 ======================================================================================== ]]>

etop:config(lines,5).

ok

======================================================================================== tiger@durin 10:12:44 Load: cpu 0 Memory: total 1859 binary 33 procs 192 processes 0 code 173 runq 2 atom 1002 ets 95 Pid Name or Initial Func Time Reds Memory MsgQ Current Function ---------------------------------------------------------------------------------------- <127.17.0> net_kernel 183 70 4092 0 gen_server:loop/6 <127.335.0> inet_tcp_dist:do_acc 141 22 1856 0 dist_util:con_loop/9 <127.19.0> net_kernel:ticker/2 155 6 1244 0 net_kernel:ticker1/2 <127.341.0> net_kernel:do_spawn_ 0 0 5840 0 dbg:do_relay_1/1 <127.43.0> ddll_server 0 0 3744 0 gen_server:loop/6 ======================================================================================== ]]>
Print to file

At any time, the current etop display can be dumped to a text file with the function etop:dump/1.

Stop

Use the function etop:stop/0 to stop etop.