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erlang调试技术之etop
etop是erlang进程信息查看工具，类似于UNIX的top.
一、配置参数
- node
- The measured node.
Value: atom()
Mandatory - setcookie
- Cookie to use for the etop node - must be the same as the cookie on the measured node.
Value: atom() - lines
- Number of lines (processes) to display.
Value: integer()
Default: 10 - interval
- The time interval (in seconds) between each update of the display.
Value: integer()
Default: 5 - accumulate
- If true the execution time and reductions are accumulated.
Value: boolean()
Default: false - sort
- Identifies what information to sort by.
Value: runtime | reductions | memory | msg_q
Default: runtime (reductions if tracing=off) - tracing
- etop uses the erlang trace facility, and thus no other tracing is possible on the measured node while etop is running, unless this option is set to off. Also helpful if the etop tracing causes too high load on the measured node. With tracing off, runtime is not measured.
Value: on | off
Default: on
二、EXPORTS
start() -> ok
This function starts etop. Note that etop is preferably started with the etop and getop scripts
start(Options) -> ok
Types:
This function starts etop. Use help/0 to see a description of the possible options.
help() -> ok
This function prints the help of etop and its options.
config(Key,Value) -> Result
Types:
This function is used to change the tool‘s configuration parameters during runtime. The table above indicates the allowed values for each parameter.
dump(File) -> Result
Types:
This function dumps the current display to a text file.
stop() -> stop
This function terminates etop.
三、实例
1、启动etop监控远程节点
erl -sname aa -remsh remote@domain
etop:start([{output,text},{lines,10},{sort,reductions},{accumulations,true},{interval,10}]).
或者etop -sname local@domain -lines 10 -sort reductions -accumulations true -interval 10 -setcookie remotecookie -remsh remote@domain(系统shell下执行)
======================================================================================== tiger@durin 13:40:32 Load: cpu 0 Memory: total 1997 binary 33 procs 197 processes 0 code 173 runq 135 atom 1002 ets 95Pid Name or Initial Func Time Reds Memory MsgQ Current Function----------------------------------------------------------------------------------------<127.23.0> 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 ========================================================================================
2、修改配置参数
etop:config(lines, 5)
(etop@durin)2> ======================================================================================== tiger@durin 10:12:44 Load: cpu 0 Memory: total 1859 binary 33 procs 192 processes 0 code 173 runq 2 atom 1002 ets 95Pid 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 ========================================================================================
erlang调试技术之etop