10 More Discussions You Might Find Interesting
1. Red Hat
Hi, I have a Linux distribution ( Oralce Enterprise Linux 5.3 i.e. Redhat ) that I have installed. It works fine when I used 2*512Mb dimms or replace them with a single 1Gb dimm. However when I try to go above 1 Gb the bootup and general performance deteriorates badly. The BIOS picks up the memory... (3 Replies)
Discussion started by: jimthompson
This is my 1st post here. I am facing a rather weired problem. I have a C++ binary running on HP-UX. The output of top as well as glance shows periodic increase in memory. But when i use gdb to detect it, i dont get the desired output...gdb says...no leaks found. Just to mention that I have... (2 Replies)
Discussion started by: kshk123
I have a scenario like the client has to search for the active server.There will be many servers.But not all server are active.And at a time not more than one server will be active.
The client will be in active state always i.e, it should always search for an active server until it gets one.I... (1 Reply)
Discussion started by: vigneshinbox
4. Shell Programming and Scripting
how the data from disk is loaded into memory and then it supplied to tcp/ip packet.
how i can trace the no of pages loaded in memory by that process and rate of context switch for that process. (1 Reply)
Discussion started by: amar20
i am building open source software on a solaris 8 machine
for couple of days i am getting error messages like
out of memory
no more processes and then build is failing
i tried with rebooting the machine but then after couple of days same problem is arising again.
can any one... (1 Reply)
Discussion started by: mobydick
On HP-UX, there is a problem about shared memory. The code open the data file and use the "mmap" system call to map into the shared memory, when the contents are make changes, there is no effective on shared memory. The codes look like the following:
...... (0 Replies)
Discussion started by: Frank2004
Hi, I try to marshal a unsigned int and a char * into a buffer, and then unmarshal them later to get them out. I need to put the char * in the front and unsigned int at the end of the buffer. However, my system always give me "BUS ERROR". I am using Sun Sparcs Sloris 2.10.
My code to marshal... (6 Replies)
Discussion started by: nj302
Hi, I am writing a C program under SCO Unix. I have a memory stack problem but do not know how to go about fixing it. I have tried running INSURE but that does not detect any problems.
Essentially the problem is that the memory address shifts on return from a routine. I pass a pointer to... (3 Replies)
Discussion started by: jkeagy
9. Filesystems, Disks and Memory
One of java programs in our machine allocates 256M of heap memory and max of 512 memory(Tomcat to be specific).
Our ulimit per process is 32M.How can a process allocates such a big amount of memory
ps v output is
PGIN SIZE RSS LIM TSIZ TRS %CPU %MEM COMMAND
24 220776 220892... (0 Replies)
Discussion started by: ganti
I have a server with a very little memory leak (29 bytes) as reported by Purify.
Itīs a pooled server, so each process lives forever accepting conections.But top or ps commands show that used memory it is always increasing much more than 29 bytes (30K mor or less) in each conection.
How... (0 Replies)
Discussion started by: Pablo J. Royo
core_addshmem_read(5) File Formats Manual core_addshmem_read(5)
core_addshmem_read - determines the inclusion of readable shared memory in a process core dump
The tunable was added in response to a problem where a customer was limited in debugging a user-level process crash because shared memory
segments were not written as part of the core file.
Upon core dump, the sections of user memory labeled as shared read-only are written (along with the normal data sections) if this tunable
is set to and left out if it is set to
Who is Expected to Change This Tunable?
Restrictions on Changing
Changes to this tunable take effect immediately.
When Should the Value of This Tunable Be Raised?
When you wish to include read-only shared memory segments in user core files due to debugging needs by developers or maintainers on the
What Are the Side Effects of Raising the Value?
User process core files would increase in most cases (most applications use at least some shared memory). This could be a problem on sys-
tems where disk space is at a premium.
When Should the Value of This Tunable Be Lowered?
When there is no need for debugging core files where shared memory corruption or data values are in question.
What Are the Side Effects of Lowering the Value?
Core files will tend to be smaller.
What Other Tunable Values Should Be Changed at the Same Time?
Certainly think about which does the same thing for read/write shared memory segments.
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
was developed by HP.
Tunable Kernel Parameters core_addshmem_read(5)