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查看Erlang运行期内部状态的方法(基于R13B04)

2011-05-06 15:25 253 查看
erts_debug:get_internal_state是用来获取Erlang运行期内部信息的主要手段. 但是这个功能是用来给开发人员或者说需要了解系统内部细节的场合, 比如说系统调优.
在R13B04可以使用的选项有:
1. reds_left
2. node_and_dist_references
3. monitoring_nodes
4. next_pid
5. next_port
6. ‘DbTable_words’
7. check_io_debug
8. process_info_args
9. processes
10. processes_bif_info
11. max_atom_out_cache_index
12. nbalance
13. available_internal_state
14. force_heap_frags
15. {process_status, Pid}
16. {link_list, Pid} 或者 {link_list, Port} 或者 {link_list, Nodename}
17. {monitor_list, Pid} 或者 {monitor_list, Nodename}
18. {channel_number, Sysname}
19. {have_pending_exit, Pid}
20. {binary_info, Binary}
21. {dist_port, Sysname}
22. {atom_out_cache_index, Atom}
23. {fake_scheduler_bindings, How} How=spread | processor_spread | thread_spread | default_bind | no_node_processor_spread | no_node_thread_spread | no_spread | unbound

使用此功能的前提是先用erts_debug:set_internal_state(available_internal_state, true).否者调用get_internal_state会提示失败.
我们演示下:

view source

print?

root@ubuntu:~/otp/
test
# erl -sname x
Erlang R14A (erts-5.8) [
source
][smp:2:2][rq:2][async-threads:0][kernel-poll:
false
]
 
 
Eshell V5.8  (abort with ^G)
(x@ubuntu)1> erts_debug:get_internal_state(check_io_debug).
** exception error: undefined
function
erts_debug:get_internal_state/1
(x@ubuntu)2> erts_debug:set_internal_state(available_internal_state,
true
).
false
=ERROR REPORT==== 7-Apr-2010::14:40:41 ===
Process <0.38.0> on node
'x@ubuntu'
enabled access to the emulator internal state.
NOTE: This is an erts internal
test
feature and should *only* be used by OTP
test
-suites.
(x@ubuntu)3> erts_debug:get_internal_state(check_io_debug).
--- fds
in
pollset --------------------------------------
fd=0
type
=chr driver_select ev=IN  inport=
#Port<0.294> inname=tty_sl -c -e indrv=tty_sl
fd=3
type
=fifo internalep_ev=IN
fd=4
type
=fifo internal
fd=7
type
=sock driver_select ev=IN  inport=
#Port<0.62> inname=tcp_inet indrv=tcp_inet
fd=8
type
=sock driver_select ev=IN  inport=
#Port<0.65> inname=tcp_inet indrv=tcp_inet
fd=9
type
=fifo driver_select ev=IN  inport=
#Port<0.486> inname=inet_gethost 4  indrv=spawn
fd=10
type
=sock driver_select ev=IN  inport=
#Port<0.492> inname=tcp_inet indrv=tcp_inet
fd=11
type
=sock driver_select ev=IN  inport=
#Port<0.495> inname=tcp_inet indrv=tcp_inet 
 
 
used fds=6
internal fds=2
---------------------------------------------------------
0
(x@ubuntu)4>  erts_debug:get_internal_state({process_status, self()}).
running
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标签：  erlang ubuntu tcp list thread exception
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