Re: [Freeipmi-devel] Recreating SDR cache before reading sensors information

[Dinh Khac Thanh]

Hi Kaiwang,

Thanks for your reply. I tested with/without recreating the cache before getting the sensor data. It works fine when the cache is recreated, e.g:
CPU1 Temp 46 C nominal 
CPU2 Temp N/A unavailable 

... 
Fan11 N/A unavailable 
Intrusion N/A unavailable 
PS Status N/A unavailable

but not when the cache is reused:

PS Status N/A unavailable 
PS Status N/A unavailable 
PS Status N/A unavailable 

...
PS Status N/A unavailable

The number of records in both cases are 30.
The code is based on ipmi-sensors.c

Best regards
Thanh

On Fri, Feb 24, 2012 at 9:12 PM, Kaiwang Chen <address@hidden> wrote:

2012/2/24 Dinh Khac Thanh <address@hidden>:

> Hi,
>
> I am working on a monitoring application that needs to get sensor
> information via IPMI every 10 seconds. I have skimmed through the source
> code for ipmi-sensors to learn how to use freeipmi.
>
> My question is: If I am using the same IPMI session to get sensor data, do I
> need to recreate the SDR cache every time before reading the data?

I believe not. The cache is checked before real ipmi traffic, and it's
a noop when the cache exists and is up to date. There is one sdr cache
per ipmi node, which defaults  to
~/.freeipmi/sdr-cache/sdr-cache-<localhost>.<ipminode>

The logic resides in common code path defined in
common/toolsdr/tool-sdr-cache-common.c:sdr_cache_create_and_load(),
which is called by run_cmd_args(), which in turn called by
_ipmi_sensors(). You can find _ipmi_sensors as callback in main
function. All of them are in ipmi-sensors/ipmi-sensors.c, in the
trunk(revision 8603).


>
> Best regards
> Thanh
>
> _______________________________________________
> Freeipmi-devel mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/freeipmi-devel
>

Thanks,
Kaiwang

-- 
Dinh Khac Thanh
You can do anything, but not everything
You miss 100 percent of the shots you never take