>From dan@stripped Wed Apr 2 17:12:36 2003
>
>In the last episode (Apr 02), Mike South said:
>> In load testing I noticed that, even though all the queries in the
>> tests are for the exact same tables, at some point in the test
>> the Open_files variable (from SHOW STATUS) drops very quickly. Does
>> anyone have any idea what would cause that?
>
>Each thread opens its own filedescriptors for the tables it uses. 10
>threads accessing 4 tables uses (10 threads * (4 table files + 4 index
>files)) = 80 fds; 100 threads uses 800.
I am reasonably sure that Open_files does not reflect how many threads
are accessing each table. Just from observation, I see that Open_files
remains pretty constant (except for the drop I mentioned above,
after which it remains constant, just at a lower level), even though
the number of threads connected/running jumps up and down. I assume
that the server is keeping references to the files open and handing them
off to threads as needed, or something along those lines.
mike
