Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #201
Difficulty: Easy
Perl is implemented as a core interpreter, written in C, together with a large collection of modules, written in Perl and C.
True or False?
Linux & Unix Commands - Search Man Pages

nstrevent(5) [hpux man page]

NSTREVENT(5)							File Formats Manual						      NSTREVENT(5)

NAME
NSTREVENT - maximum number of outstanding STREAMS bufcalls VALUES
Failsafe Default Allowed values Recommended values DESCRIPTION
This tunable limits the maximum number of outstanding that are allowed to exist in the system at any given time. This tunable is intended to protect the system against resource overload caused by the combination of modules running in all streams issu- ing an excessive number of The value selected should be equal to or greater than the combined maximum number of that can be reasonably expected during normal operation from all streams on the system. are used by STREAMS modules in low memory situations. Who Is Expected to Change This Tunable? Any customer. Restrictions on Changing Changes to this tunable take effect at next reboot. When Should the Value of This Tunable Be Raised? When the system has a lot of low memory situations. What Are the Side Effects of Raising the Value of This Tunable? If too big a number is chosen, the STREAMS subsystem preallocates more memory for internal data structures than may be needed. This reduces the amount of memory available to applications and the system. When Should the Value of This Tunable Be Lowered? If the tunable is increased for a particular STREAMS module/driver, this tunable can be lowered when that STREAMS module/driver is removed. It should be returned to its previous value. However, HP does not recommend a value lower than the default value. What Are the Side Effects of Lowering the Value of This Tunable? During low memory situations, it will bring down system performance. What Other Tunable Should Be Changed at the Same Time as This One? None. WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. Tunable Kernel Parameters NSTREVENT(5)

Check Out this Related Man Page

tcphashsz(5)							File Formats Manual						      tcphashsz(5)

NAME
tcphashsz - determines the size of the networking hash tables VALUES
Failsafe Default Allowed values Recommended values A value of 0 (default) will adjust the in proportion to the number of cores in the system. If is set to a non zero value, it should be specified as a power of two. Otherwise, it will be rounded down to the nearest power of two. DESCRIPTION
This variable is used to set the size of the networking hash tables. HP recommends that the value of be set to 0 so that the system can choose an optimal value. A system that is going to have a large number of connections on it all of the time may see some benefit of increasing this value, beyond the number determined by the system. If this tunable is not set to zero, then it needs to be a power of two. If it is not specified as a power of two, then it is rounded down to the nearest power of two. If this tunable is set in the range of 1 to 255, then it will be increased to 256. Who Is Expected to Change This Tunable? Anyone. Restrictions on Changing Changes to this tunable take effect at the next reboot. When Should the Value of This Tunable Be Raised? This value may be raised in the case of a machine with a large number of connections that last for an extended period of time. What Are the Side Effects of Raising the Value? More memory is used when this value is raised. When Should the Value of This Tunable Be Lowered? If a system is tight on memory and it has just a few connections on it, then lowering the value may reclaim some memory. What Are the Side Effects of Lowering the Value? If is set too low, the system will have long hash chains which will slow it down. What Other Tunables Should Be Changed at the Same Time? None. WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. Tunable Kernel Parameters tcphashsz(5)

Featured Tech Videos