我正在尝试使用profile.fprof配置我的Phoenix服务器。这是我使用的命令行：
PORT=4000 MIX_ENV=prod time mix profile.fprof --callers=true \
--sort=own --details -e "Profile.run_test" phx.server
但它与上述消息崩溃了。这是输出：
17:48:05.158 function=start/2 line=15 [info] Starting Hammer with backend 'Elixir.Hammer.Backend.ETS'
17:48:05.595 function=start_link/3 line=100 [info] Running Web.Endpoint with Cowboy using http://:::4000
Warmup...
** (UndefinedFunctionError) function Profile.run_test/0 is undefined (module Profile is not available)
Profile.run_test()
(mix) lib/mix/tasks/profile.fprof.ex:147: Mix.Tasks.Profile.Fprof.profile_and_analyse/2
(mix) lib/mix/tasks/profile.fprof.ex:140: Mix.Tasks.Profile.Fprof.profile/2
(elixir) lib/enum.ex:678: Enum."-each/2-lists^foreach/1-0-"/2
(elixir) lib/enum.ex:678: Enum.each/2
2.91 real 1.80 user 0.75 sys
所以我的问题是：我做错了什么？
在意识到我只是在黑暗中拍摄（感谢@Dogbert）后，我尝试了以下内容：
time mix profile.fprof --callers=true --sort=own --details \
-e "MyApp.Endpoint" phx.server
但这只会生成以下内容（并退出）：
10:08:33.592 function=start/2 line=15 [info] Starting Hammer with backend 'Elixir.Hammer.Backend.ETS'
10:08:34.000 function=start_link/3 line=100 [info] Running MyApp.Endpoint with Cowboy using http://:::4000
Warmup...
Reading trace data...
End of trace!
Processing data...
Creating output...
Done!
CNT ACC (ms) OWN (ms)
Total 3 0.015 0.015
:undefined 0 0.015 0.010
:fprof.apply_start_stop/4 0 0.015 0.010 <--
anonymous fn/0 in :elixir_compiler_1.__FILE__/1 1 0.003 0.003
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.002 0.002
:fprof.apply_start_stop/4 1 0.003 0.003
anonymous fn/0 in :elixir_compiler_1.__FILE__/1 1 0.003 0.003 <--
:fprof.apply_start_stop/4 1 0.002 0.002
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.002 0.002 <--
:suspend 1 0.000 0.000
:undefined 0 0.000 0.000 <--
:fprof.apply_start_stop/4 0 0.015 0.010
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.000 0.000
:suspend 1 0.000 0.000 <--
----------------------------------------------------------------------------------------------------
<0.73.0> 3 0.015
:undefined 0 0.015 0.010
:fprof.apply_start_stop/4 0 0.015 0.010 <--
anonymous fn/0 in :elixir_compiler_1.__FILE__/1 1 0.003 0.003
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.002 0.002
:fprof.apply_start_stop/4 1 0.003 0.003
anonymous fn/0 in :elixir_compiler_1.__FILE__/1 1 0.003 0.003 <--
:fprof.apply_start_stop/4 1 0.002 0.002
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.002 0.002 <--
:suspend 1 0.000 0.000
:undefined 0 0.000 0.000 <--
:fprof.apply_start_stop/4 0 0.015 0.010
:fprof."-apply_start_stop/4-after$^1/0-0-"/3 1 0.000 0.000
:suspend 1 0.000 0.000 <--
3.01 real 1.86 user 0.79 sys