Re: [Ganglia-developers] Fwd: Getting started with developing a C++ DSO module
Kim,
I got the tarball to which you'd put up the link earlier on in the mailing
list. I got your module to work no problem there!
But, I have a question:
All the Ganglia modules have a metric array. The mod_cpu has this:
static Ganglia_25metric cpu_metric_info[] =
{
{0, cpu_num,1200, GANGLIA_VALUE_UNSIGNED_SHORT, CPUs, zero,
%hu, UDP_HEADER_SIZE+8, Total number of CPUs},
{0, cpu_speed, 1200, GANGLIA_VALUE_UNSIGNED_INT, MHz, zero,
%u, UDP_HEADER_SIZE+8, CPU Speed in terms of MHz},
{0, cpu_user, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level},
{0, cpu_nice, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level with nice priority},
{0, cpu_system, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the system level},
{0, cpu_idle, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle and the system did not have an outstanding disk I/O request},
{0, cpu_aidle, 3800, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percent of time since boot idle CPU},
{0, cpu_wio, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle during which the system had an outstanding disk I/O request},
{0, cpu_intr, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, cpu_intr},
{0, cpu_sintr,90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, cpu_sintr},
{0, NULL}
};
Now, what if the number of metrics that my module monitors changes? Ie If I
want to monitor 5 metrics today but 10 tomorrow- Is it possible to
dynamically initialize the metrics somehow?
Will the following work:
For (how many ever metrics)
{
cpu_metric_info[i]= appropriate string
}
And put this for loop in the metric_init function..
Will that do the trick?
Thanks,
Sylvester
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Re: [Ganglia-developers] Fwd: Getting started with developing a C++ DSO module
There are more qualified people on this list to answer your question
about dynamically setting metric callbacks.
But a quick glance through gmond.c reveals that it might not be
possible with the current framework.
When gmond starts up, it calls the function setup_metric_callbacks(),
which steps through linked list of mmodule objects (core/DSO) and
registers callbacks based on your metric_info array. This happens in
the beginning within the main() block. So unless you are planning to
bounce the gmond each day and have it initialize the metric_info array
differently each time, you won't be able to do this during runtime.
Hope that helps.
JB
On Mon, Nov 16, 2009 at 5:04 PM, Sylvester Steele
sylvesterste...@gmail.com wrote:
Kim,
I got the tarball to which you'd put up the link earlier on in the mailing
list. I got your module to work no problem there!
But, I have a question:
All the Ganglia modules have a metric array. The mod_cpu has this:
static Ganglia_25metric cpu_metric_info[] =
{
{0, cpu_num, 1200, GANGLIA_VALUE_UNSIGNED_SHORT, CPUs, zero,
%hu, UDP_HEADER_SIZE+8, Total number of CPUs},
{0, cpu_speed, 1200, GANGLIA_VALUE_UNSIGNED_INT, MHz, zero,
%u, UDP_HEADER_SIZE+8, CPU Speed in terms of MHz},
{0, cpu_user, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level},
{0, cpu_nice, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level with nice priority},
{0, cpu_system, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the system level},
{0, cpu_idle, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle and the system did not have an outstanding disk I/O request},
{0, cpu_aidle, 3800, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percent of time since boot idle CPU},
{0, cpu_wio, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle during which the system had an outstanding disk I/O request},
{0, cpu_intr, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, cpu_intr},
{0, cpu_sintr, 90, GANGLIA_VALUE_FLOAT, %, both,
%.1f, UDP_HEADER_SIZE+8, cpu_sintr},
{0, NULL}
};
Now, what if the number of metrics that my module monitors changes? Ie If I
want to monitor 5 metrics today but 10 tomorrow- Is it possible to
dynamically initialize the metrics somehow?
Will the following work:
For (how many ever metrics)
{
cpu_metric_info[i]= appropriate string
}
And put this for loop in the metric_init function..
Will that do the trick?
Thanks,
Sylvester
--
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trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
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what you do best, core application coding. Discover what's new with
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Re: [Ganglia-developers] Fwd: Getting started with developing a C++ DSO module
On 11/16/2009 at 3:04 PM, in message 002c01ca6708$d7770020$866500...@com,
Sylvester Steele sylvesterste...@gmail.com wrote:
Kim,
I got the tarball to which you'd put up the link earlier on in the mailing
list. I got your module to work no problem there!
But, I have a question:
All the Ganglia modules have a metric array. The mod_cpu has this:
static Ganglia_25metric cpu_metric_info[] =
{
{0, cpu_num,1200, GANGLIA_VALUE_UNSIGNED_SHORT, CPUs, zero,
%hu, UDP_HEADER_SIZE+8, Total number of CPUs},
{0, cpu_speed, 1200, GANGLIA_VALUE_UNSIGNED_INT, MHz, zero,
%u, UDP_HEADER_SIZE+8, CPU Speed in terms of MHz},
{0, cpu_user, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level},
{0, cpu_nice, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the user level with nice priority},
{0, cpu_system, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of CPU utilization that occurred
while executing at the system level},
{0, cpu_idle, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle and the system did not have an outstanding disk I/O request},
{0, cpu_aidle, 3800, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percent of time since boot idle CPU},
{0, cpu_wio, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, Percentage of time that the CPU or CPUs were
idle during which the system had an outstanding disk I/O request},
{0, cpu_intr, 90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, cpu_intr},
{0, cpu_sintr,90, GANGLIA_VALUE_FLOAT, %,both,
%.1f, UDP_HEADER_SIZE+8, cpu_sintr},
{0, NULL}
};
Now, what if the number of metrics that my module monitors changes? Ie If I
want to monitor 5 metrics today but 10 tomorrow- Is it possible to
dynamically initialize the metrics somehow?
Will the following work:
For (how many ever metrics)
{
cpu_metric_info[i]= appropriate string
}
And put this for loop in the metric_init function..
Will that do the trick?
Take a look at the pyth_metric_init() function in the mod_python.c module. At
the end of the function, mod_python takes all of the metric definitions and
pushes them into an APR array. Then it sets the metric_info field of the
module structure with the metric_info-elts value.
python_module.metrics_info = (Ganglia_25metric *)metric_info-elts;
Basically it is just a matter of calling the APR function
apr_array_push(metric_info); for each metric definition and then filling in the
structure that is returned.
Brad
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Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
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