Hi,
Is there a command I can use to find out how many CPU's and what type are on my server? (I was told to use cat /proc/cpuinfo)
Also, how do I know what kind of bus speeds are on my server?
Thanks in advance:) (3 Replies)
Hi all,
I cannot change root owned files/directories even though I am logged in as
root.
>drwxr-xr-x 11 root root 4096 Oct 25 14:00 prodbkp
>root / # chown oracle prodbkp
prodbkp: Not owner
>id
uid=0(root) gid=3(sys) groups=0(root)
please assist.
thanks (0 Replies)
Need to find the CPU speed of HP UX for a non root login.
echo "itick_per_usec/D" | adb /stand/vmunix /dev/mem | tail -1 will give the following for non root users
ERROR: cannot open `/dev/mem', errno = 13, Permission denied (2 Replies)
Need to find CPU Speed of zLinux.
The commands like cat /proc/cpuinfo and /usr/bin/cpufreq-info does not gave me the expected results.
/usr/bin/cpufreq-info prints the
....
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
analyzing CPU 1:
no or unknown cpufreq... (1 Reply)
I get my CPU speed use pstat APIs
use this program serach google and just test it
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/pstat.h>
#define CPU_ID 0
#define HZ_PER_MHZ 1000000
int main()
{
struct pst_processor pst;
union pstun pu;
... (0 Replies)
Please let me know if there is any way I can find out (either via command line or SMF) the following:
1.CPU model (eg. Pentium 4,Celeron)
2.CPU speed (eg. 1GHz)
for this I could get the output through psrinfo -v, but still is there any other way?
3.Hard disk model (eg. Seagate).
When I... (9 Replies)
I have "inherited" a OmniOS (illumos based) server.
I noticed rsync is significantly slower in respect to my reference, FreeBSD 12-CURRENT, running on exactly same hardware.
Using same hardware, same command with same source and target disks, OmniOS r151026 gives:
test@omniosce:~# time... (11 Replies)
Discussion started by: priyadarshan
11 Replies
LEARN ABOUT NETBSD
percpu_foreach
PERCPU(9) BSD Kernel Developer's Manual PERCPU(9)NAME
percpu, percpu_alloc, percpu_free, percpu_getref, percpu_putref, percpu_foreach -- per-CPU storage allocator
SYNOPSIS
#include <sys/percpu.h>
typedef void (*percpu_callback_t)(void *, void *, struct cpu_info *);
percpu_t *
percpu_alloc(size_t size);
void
percpu_free(percpu_t *pc, size_t size);
void *
percpu_getref(percpu_t *pc);
void
percpu_putref(percpu_t *pc);
void
percpu_foreach(percpu_t *pc, percpu_callback_t cb, void *arg);
DESCRIPTION
The machine-independent percpu interface provides per-CPU, CPU-local memory reservations to kernel subsystems. percpu_alloc(size) reserves
on each CPU an independent memory region of size bytes that is local to that CPU, returning a handle (percpu_t) to those regions. A thread
may subsequently ask for a pointer, p, to the region held by the percpu_t on the thread's current CPU. Until the thread relinquishes the
pointer, or voluntarily sleeps, the thread may read or write the region at p without causing interprocessor memory synchronization.
FUNCTIONS
percpu_alloc(size)
Call this in thread context to allocate size bytes of local storage on each CPU. The storage is initialized with zeroes. Treat
this as an expensive operation. percpu_alloc() returns NULL on failure, and a handle for the per-CPU storage on success.
percpu_free(pc, size)
Call this in thread context to return to the system the per-CPU storage held by pc. size should match the size passed to
percpu_alloc(). When percpu_free() returns, pc is undefined. Treat this as an expensive operation.
percpu_getref(pc)
Disable preemption and return a pointer to the storage held by pc on the local CPU. Use percpu_getref() in either thread or inter-
rupt context. Follow each percpu_getref() call with a matching call to percpu_putref().
percpu_putref(pc)
Indicate that the thread is finished with the pointer returned by the matching call to percpu_getref(). Re-enables preemption.
percpu_foreach(pc, cb, arg)
On each CPU, for ci the corresponding struct cpu_info * and p the CPU-local storage held by pc, run (*cb)(p, arg, ci). Call this in
thread context. cb should be non-blocking and fast. Do not rely on cb to be run on the CPUs in any particular order.
CODE REFERENCES
The percpu interface is implemented within the file sys/kern/subr_percpu.c.
SEE ALSO atomic_ops(3), kmem(9), pcq(9), pool_cache(9), xcall(9)HISTORY
The percpu interface first appeared in NetBSD 6.0.
AUTHORS
YAMAMOTO Takashi <yamt@NetBSD.org>
BSD January 23, 2010 BSD