8 More Discussions You Might Find Interesting
1. UNIX for Beginners Questions & Answers
Hi,
I have a code that will show one day ahead, how to make it show two days ahead
p-dev1-db-tst:/$ day=$(TZ=IST-24 date +%d)
p-dev1-db-tst:/$ echo $day
17
p-dev1-db-tst:/$
Regards, Adam (5 Replies)
Discussion started by: answer
5 Replies
2. AIX
Hello!
I have a LPAR with 51GB RAM
topas shows 21% of memory for client pages (~11Gb)
svmon -G show 2906772 client pages in use (~11Gb)
but then i try to investigate per process client memory usage
svmon -P -O filtertype=client
and summarize inuse column, i get only 347880 pages... (1 Reply)
Discussion started by: sys
1 Replies
3. AIX
Hi,
I have a bit of a NFS problem on AiX 6.1 : When I set the mount to cio and dio - needed for a database app - Everything slows down. The following is copying 700mb, top one is a normal mount bottom one is a mount with the cio/dio option enabled :
# ./a.sh
Wed Jan 11 11:41:24 GMT 2012... (5 Replies)
Discussion started by: AJCG1976
5 Replies
4. Red Hat
Hi Friends,
Please help me to understand, how to enable async disk IO and Direct disk IO in ext3 filesystem on rhel5.
Regards,
Arumon (0 Replies)
Discussion started by: arumon
0 Replies
5. AIX
Hi all,
Can anyone define the difference between jfs and jfs2 filesystem as well as usage of jfs log files....
Thanks.... (7 Replies)
Discussion started by: sumathi.k
7 Replies
6. Shell Programming and Scripting
I would like to search a router config file for "ip address $ip", once found, I want to grab the line just before that contains "interface $interfacetype"
basically saying, 10.3.127.9 is assigned to "Loopback1" given the below as an example.
interface Loopback1
ip address 10.3.127.9... (1 Reply)
Discussion started by: popeye
1 Replies
7. AIX
hi all,
can sumbody give me a link which gives the basic layout of JFS, JFS2 and the veritas file system.
and i also want to know about the data structures used in this filsystem
thanx in advance (0 Replies)
Discussion started by: anwerreyaz
0 Replies
8. HP-UX
One cool thing about unix is that it predicts disk blocks that you may need and tries to have them in core before you need them. Over the years, various unix vendors tried various algorithms to improve performance. HP has patented their latest algorithm...
Multi-threaded Read Ahead Prediction... (0 Replies)
Discussion started by: Perderabo
0 Replies
drv_usecwait(9F) Kernel Functions for Drivers drv_usecwait(9F)
NAME
drv_usecwait - busy-wait for specified interval
SYNOPSIS
#include <sys/types.h>
#include <sys/ddi.h>
void drv_usecwait(clock_t microsecs);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
microsecs The number of microseconds to busy-wait.
DESCRIPTION
drv_usecwait() gives drivers a means of busy-waiting for a specified microsecond count. The amount of time spent busy-waiting may be
greater than the microsecond count but will minimally be the number of microseconds specified.
delay(9F) can be used by a driver to delay for a specified number of system ticks, but it has two limitations. First, the granularity of
the wait time is limited to one clock tick, which may be more time than is needed for the delay. Second, delay(9F) may only be invoked
from user context and hence cannot be used at interrupt time or system initialization.
Often, drivers need to delay for only a few microseconds, waiting for a write to a device register to be picked up by the device. In this
case, even in user context, delay(9F) produces too long a wait period.
CONTEXT
drv_usecwait() can be called from user or interrupt context.
SEE ALSO
delay(9F), timeout(9F), untimeout(9F)
Writing Device Drivers
NOTES
The driver wastes processor time by making this call since drv_usecwait() does not block but simply busy-waits. The driver should only make
calls to drv_usecwait() as needed, and only for as much time as needed. drv_usecwait() does not mask out interrupts.
SunOS 5.10 12 Nov 1992 drv_usecwait(9F)