Question

I do performance testing of our Erlang application with OpenSTA. The test runs with 100 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 test continues to run. I cannot find info about this error. Does eacces mean Error accessing a resource?

EDIT: As pointed out by @Muzaaya Joshua 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}

This 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 read_file documentation?

Thanks in advance.

Martin

Answer 1

I managed to fix this errors by increasing the file size of the allowed in cache files in the YAWS configuration max_size_cached_file. This made our .yaws file to be loaded in memory and not accessess with file:read_file all the time. Hopefully this will save someone else couple of hours (or days :))