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Full Discussion: unable to allocate enough memory
Top Forums UNIX for Advanced & Expert Users unable to allocate enough memory Post 302190737 by rein on Wednesday 30th of April 2008 11:15:34 AM
Old 04-30-2008
unable to allocate enough memory
On SunOS 5.8 I get an error when starting a large Java process with over 2Gb memory.

Code:
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 enough consecutive memory blocks available.

top reports the following:

Code:
load averages:  0.81,  0.91,  1.26                                   17:03:16
284 processes: 283 sleeping, 1 on cpu
CPU states: 90.4% idle,  6.0% user,  2.4% kernel,  1.1% iowait,  0.0% swap
Memory: 32G real, 11G free, 28G swap in use, 2491M swap free

Thus even though we have 11Gb out of 32Gb free on our 6CPU system we can't allocate enough memory.

uptime reports:
Code:
5:13pm  up 237 day(s), 9 min(s),  19 users,  load average: 0.93, 1.16, 1.27

Is it possible that the memory is too fragmented? How can we tell? or how can we fix this?
 

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LEARN ABOUT LINUX

uptime

UPTIME(1)							Linux User's Manual							 UPTIME(1)

NAME

       uptime - Tell how long the system has been running.

SYNOPSIS

       uptime
       uptime [-V]

DESCRIPTION

       uptime  gives  a one line display of the following information.	The current time, how long the system has been running, how many users are
       currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

       This is the same information contained in the header line displayed by w(1).

       System load averages is the average number of processes that are either in a runnable or uninterruptable state.	A process  in  a  runnable
       state  is either using the CPU or waiting to use the CPU. A process in uninterruptable state is waiting for some I/O access, eg waiting for
       disk.  The averages are taken over the three time intervals.  Load averages are not normalized for the number of CPUs in  a  system,  so  a
       load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.

FILES

       /var/run/utmp
	      information about who is currently logged on

       /proc  process information

AUTHORS

       uptime was written by Larry Greenfield <greenfie@gauss.rutgers.edu> and Michael K. Johnson <johnsonm@sunsite.unc.edu>.

       Please send bug reports to <albert@users.sf.net>

SEE ALSO

       ps(1), top(1), utmp(5), w(1)

Cohesive Systems						    26 Jan 1993 							 UPTIME(1)
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