12-15-2010
If you want help, you should provide complete system details, including hardware, software (OS and applications), etc.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
can someone tell me a good site to go to in order to learn this. please do not recommen nay books because i dont have interest in that. if you know of any good sites with good straight forward explanation on how to split loads on machines that has excessive loading, please let me know
Also,... (1 Reply)
Discussion started by: TRUEST
1 Replies
2. Filesystems, Disks and Memory
Hi all,
long time ago I posted something, but now, it is needed again :(
Currently, I am handling with a big NFS Server for more than 200 clients, this sever has to work with 256 NFSDs. Because of this huge amount of NFSDs, there are thousands of small write accesses down to the disk and... (3 Replies)
Discussion started by: malcom
3 Replies
3. UNIX for Dummies Questions & Answers
Hi to all,
I'm interested in finding an introduction about Performance Tuning under Unix (or Linux); can somebody please point me in the right direction?
Best regards (1 Reply)
Discussion started by: domyalex
1 Replies
4. Shell Programming and Scripting
Sorry,
This is out of scope of this group.But I require the clarification pretty urgently.
My Oracle database is parallely enabled.
Still,in a particular table queries do not work "parallely" always.
How is this? (9 Replies)
Discussion started by: kthri
9 Replies
5. Shell Programming and Scripting
Hi All,
In last one week, i have posted many questions in this portal. At last i am succeeded to make my 1st unix script.
following are 2 points where my script is taking tooooo long.
1. Print the total number of records excluding header & footer. I have found that awk 'END{print NR -... (2 Replies)
Discussion started by: Amit.Sagpariya
2 Replies
6. UNIX for Advanced & Expert Users
Hi,
I am facing a strange issue. Application is deployed in a cluster with 2 Unix nodes (with same configuration). On one node the application is working fine but on another node we see this behavior I found using vmstat- when the server is not yet started everything is OK; when you start the... (3 Replies)
Discussion started by: ash.abrol
3 Replies
7. Solaris
Dear all,
I have a Local zone , where users feel that performance is not good.
Is it wise to collect the inputs from the local zone rather than taking from the global zone.
And also Can I tune from Global zone , so that it will reflect in local zone.
Rgds
rj (2 Replies)
Discussion started by: jegaraman
2 Replies
8. Tips and Tutorials
Overview:
Introduction
What Does Success Mean?
What Does Performance Mean?
Every Picture is Worth a Thousand Words
Work Like a Physicist
Work Like You Walk - One Step at a Time
Learn to Know Your System
Choose Your Weapons!
Tools of the Trade 1 - vmstat
A Little Theory Along the Way -... (1 Reply)
Discussion started by: bakunin
1 Replies
9. AIX
I have a IBM Power9 server coupled with a NVMe StorWize V7000 GEN3 storage, doing some benchmarks and noticing that single thread I/O (80% Read / 20% Write, common OLTP I/O profile) seems slow.
./xdisk -R0 -r80 -b 8k -M 1 -f /usr1/testing -t60 -OD -V
BS Proc AIO read% IO Flag IO/s ... (8 Replies)
Discussion started by: c3rb3rus
8 Replies
LEARN ABOUT OPENSOLARIS
posix_madvise
posix_madvise(3C) Standard C Library Functions posix_madvise(3C)
NAME
posix_madvise - memory advisory information
SYNOPSIS
#include <sys/mman.h>
int posix_madvise(void *addr, size_t len, int advice);
DESCRIPTION
The posix_madvise() function advises the system on the expected behavior of the application with respect to the data in the memory starting
at address addr, and continuing for len bytes. The system may use this information to optimize handling of the specified data. The
posix_madvise() function has no effect on the semantics of access to memory in the specified range, although it may affect the performance
of access.
The advice to be applied to the memory range is specified by the advice parameter and may be one of the following values:
POSIX_MADV_NORMAL Specifies that the application has no advice to give on its behavior with respect to the specified range. It is
the default characteristic if no advice is given for a range of memory.
POSIX_MADV_SEQUENTIAL Specifies that the application expects to access the specified range sequentially from lower addresses to higher
addresses.
POSIX_MADV_RANDOM Specifies that the application expects to access the specified range in a random order.
POSIX_MADV_WILLNEED Specifies that the application expects to access the specified range in the near future.
POSIX_MADV_DONTNEED Specifies that the application expects that it will not access the specified range in the near future.
These values are defined in <sys/mman.h>
RETURN VALUES
Upon successful completion, posix_madvise() returns zero. Otherwise, an error number is returned to indicate the error.
ERRORS
The posix_madvise() function will fail if:
EINVAL The value of advice is invalid.
ENOMEM Addresses in the range starting at addr and continuing for len bytes are partly or completely outside the range allowed for the
address space of the calling process.
The posix_madvise() function may fail if:
EINVAL The value of len is zero.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
|Standard |See standards(5). |
+-----------------------------+-----------------------------+
SEE ALSO
mmap(2), madvise(3C), posix_madvise(3C), attributes(5), standards(5)
SunOS 5.11 14 Jul 2008 posix_madvise(3C)