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Field / Description
Tuning Formula or Default Value
(Default value is provided if there is no
tuning formula)
Maximum Permanent Generation Size
(MB)
Controls the maximum size of the
permanent generation heap allocated to the
server JVM. It stores all the class code and
class-like data.
The value of the parameter should be large
enough to fit all the classes that are
concurrently loaded. Sometimes, it is
difficult to determine the actual value of this
parameter because generally, this region is
smaller and expands slowly, and the
utilization is commonly observed at 99-100
percent of its current capacity. If you have
not configured this region correctly, the JVM
might fail with the error.
Based on your operating system and
architecture, the parameters are provided in
the following list:
v HP-UX 32-bit: (HP-UX.MAX_PERM_SIZE)
v HP-UX 64-bit: (HP-UX-
64.MAX_PERM_SIZE)
v IBM AIX 32-bit: (AIX.MAX_PERM_SIZE)
v IBM AIX 64-bit: (AIX-
64.MAX_PERM_SIZE)
v Sun Solaris 32-bit:
(SunOS.MAX_PERM_SIZE)
v Sun Solaris 64-bit: (SunOS-
64.MAX_PERM_SIZE)
v Linux 32-bit: (Linux.MAX_PERM_SIZE)
v Linux 64-bit: (Linux-64.MAX_PERM_SIZE)
v Windows 32-bit:
(Windows.MAX_PERM_SIZE)
v Windows 64-bit: (Windows-
64.MAX_PERM_SIZE)
v IBM iSeries OS/400:
(OS400.MAX_PERM_SIZE)
v IBM OS/390: (OS390.MAX_PERM_SIZE)
tuning.properties Property:
[operating system].MAX_PERM_SIZE
Based on your operating system and
architecture, Sterling B2B Integrator allocates
the following values (in MB):
v HP-UX (32-bit and 64-bit): 512
v IBM AIX (32-bit and 64-bit): 384
v Sun Solaris (32-bit and 64-bit): 384
v Linux (32-bit and 64-bit): 384
v Windows 32-bit: 256
v Windows 64-bit: 384
v IBM iSeries OS/400: 384
v IBM OS/390: 384
Performance Management 135