The function should be terminated by a signal. Is this feasible
Executing function is not visible to the kernel but the process in which its wrapped is available to the external world for communication. I guess this is what you meant right?
Keeping pinging for the load average often if it exceeds or equals commit suicide or restart
On user complains about the performance of web application, as a part application support, we use following commands to see the CPU utilization in the UNIX using ‘sar' command. Some times it goes below 20 and even reaches 0.
HLW$~> sar -u 10 60
SunOS HLW 5.8 Generic_117350-14 sun4u ... (2 Replies)
Hi, iam new to AIX and had a basic question.
I was asked to give a chart of CPU utilization in percentage for every hour.
where can i look for information and which column should i look at?
I would be very thankful if somebody could respond.
Thanks!
karthik (1 Reply)
Dear friends,
I am doing a report daily for all most 30 more serves... i need to check out CPU utlization bu (top command, 100 - (ideal value))
and Memory utilization too
could some one help me how can i get it directly, if scripts also no problem..
i will very thankful if some one... (3 Replies)
Hi to All,
Would you please help me.
I would like to know, In Unix How to know CPU utilization for every process.
Thanks in Advance.
Thanks,
Divyang (3 Replies)
hi,
i want to know cpu utilizatiion per process per cpu..for single processor also if multicore in linux ..to use these values in shell script to kill processes exceeding cpu utilization.ps (pcpu) command does not give exact values..top does not give persistant values..psstat,vmstat..does njot... (3 Replies)
I know how to check the CPU utilization and memory space
like:
vmstat
top
free
What i want ot check on my linux system is...
how much CPU are available on my system and do i need to put extra CPU.
Also need to check the hardware configuration and the space related to the same
... (3 Replies)
Hi,
any commande on AIX 6.1 that shows me total CPU utilization ?
I saw curt in documentation but there should be a trace file before.
Thank you. (1 Reply)
Hi,
i am new to linux/RHEL 6.0 and i have two questions.
1) How to get the CPU utilization and Memory Utilization of all Services running currently?
2) How to get the CPU utilization and Memory Utilization of all Applications running currently?
Please help me to find the script.
... (2 Replies)
Discussion started by: nossam
2 Replies
LEARN ABOUT DEBIAN
sam_overview
SAM_OVERVIEW(8) Corosync Cluster Engine Programmer's Manual SAM_OVERVIEW(8)NAME
sam_overview - Overview of the Simple Availability Manager
OVERVIEW
The SAM library provide a tool to check the health of an application. The main purpose of SAM is to restart a local process when it fails
to respond to a healthcheck request in a configured time interval.
During sam_initialize(3), a duplicate copy of the process is created using the fork(3) system call. This duplicate process copy contains
the logic for executing the SAM server. The SAM server is responsible for requesting healthchecks from the active process, and controlling
the lifecycle of the active process when it fails. If the active process fails to respond to the healthcheck request sent by the SAM
server, it will be sent a user configurable signal (default SIGTERM) to request shutdown of the application. After a configured time
interval, the process will be forcibly killed by being sent a SIGKILL signal. Once the active process terminates, the SAM server will cre-
ate a new active process.
The Simple Availability Manager is meant to be used in conjunction with the cpg service. Used together, it is possible to restart a cpg
process that fails healthchecking during operation.
The main features of SAM include:
o A configurable recovery policy.
o A configurable time interval for health check operations.
o A notification via signal before recovery action is taken.
o A mechanism to indicate to the application the number of times an active process has been created by the SAM server.
o Both application driven health checking and event driven health checking.
Initializing SAM
The SAM library is initialized by sam_initialize(3). sam_initalize(3) may only be called once per process. Calling it more then once has
undefined results and is not recommended or tested.
Setting warning callback
User configurable signal (default SIGTERM) is sent to the application when a recovery action is planned. The application can use the sig-
nal(3) system call to monitor for this signal.
There are no special constraints on what SAM apis may be called in a warning callback. After time_interval expires, a SIGKILL signal is
sent to the active process to force its termination.
Registering the active process
The active process is registered with SAM by calling sam_register(3). This function should only be called one time in a process. After a
recovery action is taken, the new active process will begin execution at the next line of code in a user process after sam_register(3).
Enabling event driven healthchecking
Two types of healthchecking are available to the user. The first model is one where the user application healthchecks during its normal
operation. It is never requested to healtcheck, and if the active process doesn't respond within the time interval, the process will be
restarted.
A more useful mechanism for healthchecking is event driven healthchecking. Because this model is directed by the SAM server, It isn't nec-
essary to guess or add timers to the active process to signal a healthcheck operation is successful. To use event driven healthchecking,
the sam_hc_callback_register(3) function should be executed.
BUGS SEE ALSO sam_initialize(3), sam_finalize(3), sam_start(3), sam_stop(3), sam_register(3), sam_warn_signal_set(3), sam_hc_send(3), sam_hc_call-
back_register(3)corosync Man Page 12/01/2009 SAM_OVERVIEW(8)