01-09-2003
Backgrounding process with higher priority
I have been troubleshooting a mysterious performance problem with the nightly batch programs on our primary system for quite some time and just found something very interesting. All batch processes are running with a nice value of 24. I don't know what the default is on other systems but I do know that on HP-UX the default is 20.
I then did some investigating to find out that all processes that run in the background with an "&" automatically run with an offset of (+)4. And this coincides with the problems we've been seeing that when users start logging on in the morning the batch times increase significantly.
Does anyone have any suggestions on how to fix this? Is there a default setting I can change for this. We actually want the batch to finish as quickly as possible and if anything should be running with an offset of -4.
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LEARN ABOUT DEBIAN
iob_new
iob_new(3) Library Functions Manual iob_new(3)
NAME
iob_new - create new I/O batch
SYNTAX
#include <iob.h>
io_batch* iob_new(int hint_entries);
DESCRIPTION
iob_new creates a new I/O batch with enough space allocated for hint_entries entries (buffers or files). This is purely a performance
hint, if you are unsure just pass 1.
You can add buffers, strings and files to an I/O batch and then send it all at once using iob_send.
The benefit of the I/O batch API is that it exploits platform specific APIs like FreeBSD's sendfile. The file contents will always be sent
in a way that allows the operating systems to perform zero copy TCP, and the buffers will always be sent using as few syscalls as possible
and avoiding unnecessary copying (using writev).
RETURN VALUE
iob_new returns a pointer to an I/O batch data structure. If there was a memory allocation error, it returns NULL instead.
SEE ALSO
iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3)
iob_new(3)