It's based on knowing only Windows API calls. There is an API there, VirtualAlloc that allocates virtual -per the description anyway- memory (swapfile space).
On SunOS 5.8 I get an error when starting a large Java process with over 2Gb memory.
Error occurred during initialization of VM
Could not reserve enough space for object heap
When stopping several other Java processes we can start this process. This seems to indicate that we don't have... (11 Replies)
Hi,
I have 2 systems with same hardware and software. One system is giving me error "Error occurred during initialization of VM Could not reserve enough space for object " when I tried to increase JBoss App's heap size to 2GB while the other system is running fine without any issue. Is there... (5 Replies)
hi... i want to find oracle allocate how many memory really..
i execute this code to list memory on unix system : ps -eo pmem,args | sort -k 1 -r -n
outputs ;
%mem command
12.9|ora_smon_RTX
12.9|ora_s000_RTX
12.9|ora_reco_RTX
12.9|ora_qmnc_RTX... (2 Replies)
Hi,
In my proj, one process was running for 2 days. after 2 days its throwing an error message "shmget failed cannot allocate memory". the same problem happened every time.i.e. i can reproduce the same issue if my process is running for every 2 days for a same operation.Within this 2 days there... (1 Reply)
Hi,
In my proj, one process was running for 2 days. after 2 days its throwing an error message "shmget failed cannot allocate memory". the same problem happened every time.i.e. i can reproduce the same issue if my process is running for every 2 days for a same operation.Within this 2 days there... (1 Reply)
Hi,
In my proj, one process was running for 2 days. after 2 days its throwing an error message "shmget failed cannot allocate memory". the same problem happened every time.i.e. i can reproduce the same issue if my process is running for every 2 days for a same operation.Within this 2 days there... (1 Reply)
hi
I want to take string as a input from user and the string is very very length. From the lengthy string i have to substring take first 16 letters, then next 8 letters,................... Please guide me how to write program to take lengthy string from user and sub string it.
Thanks (4 Replies)
On SunOS 10 get an error when starting a large Java process with over 2Gb memory.
Error occurred during initialization of VM
Could not reserve enough space for object heap
i have 32G memory !! , swap = 31G
Please any advice !!! (3 Replies)
Hi , experts.
I work on Linux station (RedHat 5.7), regular user, but have root password.
%> uname -a
Linux ran1log06 2.6.18-238.1.1.el5 #1 SMP Tue Jan 4 13:32:19 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
%> cat /etc/issue
Red Hat Enterprise Linux Client release 5.7 (Tikanga)
Kernel \r on... (5 Replies)
Discussion started by: baruchgu
5 Replies
LEARN ABOUT REDHAT
mremap
MREMAP(2) Linux Programmer's Manual MREMAP(2)NAME
mremap - re-map a virtual memory address
SYNOPSIS
#include <unistd.h>
#include <sys/mman.h>
void * mremap(void *old_address, size_t old_size , size_t new_size, unsigned long flags);
DESCRIPTION
mremap expands (or shrinks) an existing memory mapping, potentially moving it at the same time (controlled by the flags argument and the
available virtual address space).
old_address is the old address of the virtual memory block that you want to expand (or shrink). Note that old_address has to be page
aligned. old_size is the old size of the virtual memory block. new_size is the requested size of the virtual memory block after the
resize.
The flags argument is a bitmap of flags.
In Linux the memory is divided into pages. A user process has (one or) several linear virtual memory segments. Each virtual memory seg-
ment has one or more mappings to real memory pages (in the page table). Each virtual memory segment has its own protection (access
rights), which may cause a segmentation violation if the memory is accessed incorrectly (e.g., writing to a read-only segment). Accessing
virtual memory outside of the segments will also cause a segmentation violation.
mremap uses the Linux page table scheme. mremap changes the mapping between virtual addresses and memory pages. This can be used to
implement a very efficient realloc.
FLAGS
MREMAP_MAYMOVE
indicates if the operation should fail, or change the virtual address if the resize cannot be done at the current virtual address.
RETURN VALUE
On success mremap returns a pointer to the new virtual memory area. On error, -1 is returned, and errno is set appropriately.
ERRORS
EINVAL An invalid argument was given. Most likely old_address was not page aligned.
EFAULT "Segmentation fault." Some address in the range old_address to old_address+old_size is an invalid virtual memory address for this
process. You can also get EFAULT even if there exist mappings that cover the whole address space requested, but those mappings are
of different types.
EAGAIN The memory segment is locked and cannot be re-mapped.
ENOMEM The memory area cannot be expanded at the current virtual address, and the MREMAP_MAYMOVE flag is not set in flags. Or, there is
not enough (virtual) memory available.
NOTES
With current glibc includes, in order to get the definition of MREMAP_MAYMOVE, you need to define _GNU_SOURCE before including
<sys/mman.h>.
CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable. 4.2BSD had a (never actually implemented)
mremap(2) call with completely different semantics.
SEE ALSO getpagesize(2), realloc(3), malloc(3), brk(2), sbrk(2), mmap(2)
Your favorite OS text book for more information on paged memory. (Modern Operating Systems by Andrew S. Tannenbaum, Inside Linux by Ran-
dolf Bentson, The Design of the UNIX Operating System by Maurice J. Bach.)
Linux 1.3.87 1996-04-12 MREMAP(2)