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Inherit max_safe_fds to child processes in EXEC_BACKEND mode.

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Postmaster sets max_safe_fds by testing how many open file descriptors it
can open, and that is normally inherited by all child processes at fork().
Not so on EXEC_BACKEND, ie. Windows, however. Because of that, we
effectively ignored max_files_per_process on Windows, and always assumed
a conservative default of 32 simultaneous open files. That could have an
impact on performance, if you need to access a lot of different files
in a query. After this patch, the value is passed to child processes by
save/restore_backend_variables() among many other global variables.

It has been like this forever, but given the lack of complaints about it,
I'm not backpatching this.
This commit is contained in:
Heikki Linnakangas
2012-03-29 08:19:11 +03:00
parent d2c1740dc2
commit 5762a4d909
3 changed files with 9 additions and 1 deletions
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2
src/backend/storage/file/fd.c
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@ -103,7 +103,7 @@ int max_files_per_process = 1000;
* Note: the value of max_files_per_process is taken into account while
* setting this variable, and so need not be tested separately.
*/
static int max_safe_fds = 32; /* default if not changed */
int max_safe_fds = 32; /* default if not changed */
/* Debugging.... */