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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 DEBIAN

xsysinfo

XSYSINFO(1x)							 Debian GNU/Linux						      XSYSINFO(1x)

NAME

       xsysinfo - Display Linux kernel parameters in graphical form

SYNOPSIS

       xsysinfo [-help] [-update n] [-[no]title] [-[no]labels] [-[no]loadavg] [-[no]load] [-[no]mem] [-[no]swap] [-[no]smp]

DESCRIPTION

       Xsysinfo  is  an  X application to display some Linux kernel parameters in graphical form. It is like a mix of top, free and xload with the
       difference that the values are shown in form of a horizontal bar. The displayed values are: CPU load average, CPU  load,  memory  and  swap
       sizes (details see below).

OPTIONS

       -update n
	      Set update rate to n milli-seconds

       -title Show title string

       -notitle
	      Don't show title string

       -labels
	      Show gauge labels

       -nolabels
	      Don't show gauge labels

       -loadavg
	      Show CPU load average value

       -noloadavg
	      Don't show CPU load average value

       -load  Show CPU load value

       -noload
	      Don't show CPU load value

       -smp   Show separate SMP loads

       -nosmp Don't show separate SMP loads.

       -mem   Show memory info

       -nomem Don't show memory info

       -swap  Show swap info

       -noswap
	      Don't show swap info

       -help  Display options

DISPLAY

       Xsysinfo display the following values:

       CPU load average
	      CPU load average between 0.000-8.000. The gauge's bar is subdivided into segments, where one segment represents a load value of 1.0.
	      The bar's full length is automatically scaled, depending on the displayed value.

       CPU load
	      percentage CPU load time to CPU idle time subdivided in three segments: user load, system load and nice load. On an SMP  system  the
	      -smp option replaces the single total load meter with a separate meter for each processor.

       Memory The  memory  gauge's  bar is subdivided into two segments with the amount of physical memory, which is used by processes on the left
	      and physical memory used for the page and buffer cache on the right. The length of the whole bar, which is the sum of these two val-
	      ues, shows the amount of physical memory currently used by the system.

       Swap   The percentage of swap space used by the system to total amount of swap space.

AUTHORS

       Xsyinfo	is written by Gabor Herr <herr@iti.informatik.th-darmstadt.de> and currently maintained by Ronald Wahl <ronald.wahl@informatik.tu-
       chemnitz.de>.

       This manual page was created by Roland Rosenfeld <roland@spinnaker.de> for the Debian GNU/Linux system (but may be used by others).

Debian Project							   December 2005						      XSYSINFO(1x)
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