03-10-2009
Quote:
Originally Posted by
scotbuff
I hear you, cheap boss, development environment. The HP-UX servers were dumped in my lap after our old admin quit.
You can have your boss read this thread.
The days of using swap were because memory was expensive. Memory is very cheap now. Money should not be the reason to sacrifice performance for a few dollars of memory.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
When i re-updated my system i set my swap at 500 MB. I have 256 in ram and have never even gone into the 250 mb of swap that i had originally configured. How do I reduce the swap? (3 Replies)
Discussion started by: macdonto
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Is it really so that if swap will be located in the begining of hard drive, than it will work faster? (1 Reply)
Discussion started by: Ty3
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3. Solaris
So with solaris 10 are people not using the old /tmp as a regular UFS filesystem and making /tmp part of swap or tmpfs... what are peoples thoughts on this? (5 Replies)
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4. Solaris
When i try to type swap -l ,nothing come out but blinking.
May i know what is the problem and solutions ?
thanks (6 Replies)
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5. Solaris
Hello and thanks in advance.
I have a Sun box with raid 1 on the O/S disks using solaris svm.
I want to unmirror my swap partition, and add the slice on the second disk as an additional swap device. This would give me twice as much swap space.
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6. Red Hat
free -m : 1023 total swap space
created default partition /dev/sdb1 50M using fdisk. i did write the changes.
#mkswap /dev/sdb1
#swapon /dev/sdb1
free -m : 1078 total swap space
this shows that the swap is on
Question : i did not change the type LINUX SWAP (82) in fdisk.
so why is... (5 Replies)
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7. HP-UX
Hi
I have an integrity machine rx7620 and rx8640 running hp-ux 11.31. I'm planning to fine tune the system:
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Hi,
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Hi,
Can somebody please help here, since iam just a beginner.
According to my book knowledge.
the Avalilable memory calculated by swap -l (includes only swap) should be small as compared to swap -s value(includes Virtual memory=swap +physical).
but this is quite opposite in my case.
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Hi Solaris Folks :),
I need to calculate the swap usage on solaris server, please let me understand the output of below swap -s and swap -l commands.
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total: 1774912k bytes allocated + 240616k reserved = 2015528k used, 14542512k available
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LEARN ABOUT X11R4
sysinfo
SYSINFO(2) Linux Programmer's Manual SYSINFO(2)
NAME
sysinfo - return system information
SYNOPSIS
#include <sys/sysinfo.h>
int sysinfo(struct sysinfo *info);
DESCRIPTION
sysinfo() returns certain statistics on memory and swap usage, as well as the load average.
Until Linux 2.3.16, sysinfo() returned information in the following structure:
struct sysinfo {
long uptime; /* Seconds since boot */
unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
unsigned long totalram; /* Total usable main memory size */
unsigned long freeram; /* Available memory size */
unsigned long sharedram; /* Amount of shared memory */
unsigned long bufferram; /* Memory used by buffers */
unsigned long totalswap; /* Total swap space size */
unsigned long freeswap; /* Swap space still available */
unsigned short procs; /* Number of current processes */
char _f[22]; /* Pads structure to 64 bytes */
};
In the above structure, the sizes of the memory and swap fields are given in bytes.
Since Linux 2.3.23 (i386) and Linux 2.3.48 (all architectures) the structure is:
struct sysinfo {
long uptime; /* Seconds since boot */
unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
unsigned long totalram; /* Total usable main memory size */
unsigned long freeram; /* Available memory size */
unsigned long sharedram; /* Amount of shared memory */
unsigned long bufferram; /* Memory used by buffers */
unsigned long totalswap; /* Total swap space size */
unsigned long freeswap; /* Swap space still available */
unsigned short procs; /* Number of current processes */
unsigned long totalhigh; /* Total high memory size */
unsigned long freehigh; /* Available high memory size */
unsigned int mem_unit; /* Memory unit size in bytes */
char _f[20-2*sizeof(long)-sizeof(int)];
/* Padding to 64 bytes */
};
In the above structure, sizes of the memory and swap fields are given as multiples of mem_unit bytes.
RETURN VALUE
On success, sysinfo() returns zero. On error, -1 is returned, and errno is set to indicate the cause of the error.
ERRORS
EFAULT info is not a valid address.
VERSIONS
sysinfo() first appeared in Linux 0.98.pl6.
CONFORMING TO
This function is Linux-specific, and should not be used in programs intended to be portable.
NOTES
All of the information provided by this system call is also available via /proc/meminfo and /proc/loadavg.
SEE ALSO
proc(5)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 SYSINFO(2)