[erlang-questions] Yaws process died when executing read_file

[Steve Vinoski]

On Wed, Oct 19, 2011 at 6:46 AM, Martin Dimitrov <mrtndimitrov@REDACTED> wrote:
> I do performance testing of our Erlang application with OpenSTA. The
> test runs with 300 virtual users. At some point the following errors
> start popping up:
>
> Yaws process died: {{badmatch,{error,eacces}},
>                [{yaws_server,ut_read,1},
>                 {yaws_server,deliver_dyn_file,5},
>                 {yaws_server,aloop,3},
>                 {yaws_server,acceptor0,2},
>                 {proc_lib,init_p_do_apply,3}]}
>
> The call file:read_file(UT#urltype.fullpath) crashes in function
> ut_read(UT). I recompiled the module and printed the context. The error
> is eacces and UT holds:
>
> {urltype,yaws,
>                          {file_info,14088,regular,read_write,
>                              {{2011,9,13},{11,51,42}},
>                              {{2011,10,17},{17,59,44}},
>                              {{2011,3,16},{13,18,58}},
>                              33206,1,3,0,0,0,0},
>                          "/handler.yaws",
>                          "c:/Temp/harmony/script/../www/handler.yaws",
>                          "/",undefined,undefined,"text/html",
>                          "/handler.yaws",undefined}
>
> The file handler.yaws is the entry point of our app and is called on
> every request. When I run the test with 100 or less virtual users I
> don't see these errors. So how can it be "Missing permission for reading
> the file, or for searching one of the parent directories" as the error
> is described in the file:read_file documentation?

Please let us know:

* what operating system and version you're using
* what version of Erlang you're using
* what version of Yaws you're using

--steve