Maximum number of threads per user Post: 21822

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Top Forums UNIX for Advanced & Expert Users Maximum number of threads per user Post 21822 by hugo_perez on Thursday 23rd of May 2002 10:29:18 AM

05-23-2002

Registered User

File: /etc/system

parameter: segkpsize

Description:

Specify the amount of kernel pageable memory
available. This memory is used primarily for
kernel thread stacks. Increasing this number
allows either larger stacks for the same number
of threads or more threads. This parameter can
only be set on systems running 64-bit kernels
Systems running 64-bit kernels use a default
stack size of 24 Kbytes.

Data Type: Unsigned long

Default: 64-bit kernels, 2 Gbytes
32-bit kernels, 512 Mbytes

Range: 64-bit kernels, 512 Mbytes - 24 Gbytes
32-bit kernels, 512 Mbytes

Units: Mbytes

Dynamic? No

Validation:
Value is compared to minimum and maximum
sizes (512 Mbytes and 24 Gbytes for 64-bit
systems) and if smaller than the minimum or
larger than the maximum, it is reset to 2 Gbytes
and a message to that effect is displayed.
The actual size used in creation of the cache is
the lesser of the value specified in segkpsize
after the constraints checking and 50% of
physical memory.

When to Change: This is one of the steps necessary to support largenumbers of processes on a system. The default
size of 2 Gbytes, assuming at least 1 Gbyte of
physical memory is present, allows creation of
24-Kbyte stacks for more than 87,000 kernel
threads. The size of a stack in a 64-bit kernel is
the same whether the process is a 32-bit process
or a 64-bit process. If more than this number is
needed, segkpsize can be increased assuming
sufficient physical memory exists.

See also nfs:nfs_max_threads if you use NFS.

Regards. Hugo.

hugo_perez

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sys_attrs_net

sys_attrs_net(5)						File Formats Manual						  sys_attrs_net(5)

NAME

       sys_attrs_net - net subsystem attributes

DESCRIPTION

       This  reference page lists and describes attributes for the Network (net) kernel subsystem. Refer to the sys_attrs(5) reference page for an
       introduction to the topic of kernel subsystem attributes.

	      Enables (1) or disables (0) traffic control on all network interfaces on the system.

	      Default value: 0 (disabled)

	      Minimum value: 0

	      Maximum value: 1

	      Maximum number of mbufs enqueued on an interface's output queue before packets are dropped.

	      Default value: 1024 (bytes)

	      Minimum value: 1024

	      Maximum value: 65535

	      The default maximum transmission unit (MTU) for all loopback (lo) interfaces.

	      Default value: 4096 (bytes)

	      Minimum value: 68

	      Maximum value: 65535

	      Maximum number of loopback (lo) interfaces on a system. The interfaces are numbered sequentially starting with 0 (for example, lo0).

	      Default value: 1 (interface)

	      Minimum value: 1

	      Maximum value: 16581375 (or until memory is exhausted)

	      Enables (1) or disables (0) fair allocation of netisr protocol threads. When enabled (1), only 1 netisr thread runs for each  proto-
	      col queue.

	      Default value: 1 (enabled)

	      Minimum value: 0

	      Maximum value: 1

	      The priority of the netisr protocol threads.

	      Default value: 33

	      Minimum value: 0

	      Maximum value: 63

	      Number of network threads configured in a system.

	      Default  value: n (Based on the number of CPUs in a system.  For a system with one processor, the value is 1.  For a multiprocessing
	      system, the value is 1 plus the number of processors.)

	      Minimum value: 1

	      Maximum value: 50

	      Number of packets (packet threshold) above which another netisr thread is started.

	      Default value: 1 (packet)

	      Minimum value: 1

	      Maximum value: INT_MAX, or 2 billion

	      Number of packet filter devices on a system.

	      Default value: 256 (devices), if PACKETFILTER option is configured in the kernel; otherwise, 0

	      Minimum value: 256

	      Maximum value: 4096

	      Number of serial line internet protocol (SLIP) lines.

	      Default value: 1 (line)

	      Minimum value: 1

	      Maximum value: 50

	      Depth of the kernel cache used by the screend facility.

	      Default value: 8 (entries)

	      Minimum value: 8

	      Maximum value: 16

	      Width of the kernel cache used by the screend facility.

	      Default value: 8 (entries)

	      Minimum value: 8

	      Maximum value: 4096

	      Maximum number of packets pending allowed in the screend facility queue.

	      Default value: 32 (packets)

	      Minimum value: 32

	      Maximum value: 16384

SEE ALSO

       sys_attrs(5)

       System Configuration and Tuning

																  sys_attrs_net(5)