Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Fri, 23 Sep 2016 12:51:24 +0000

> Am I right in thinking this should work with NDArrays of different data types or dimensions, 
> at least if the driver or plugin maintained different NDArrayPool instances?

That is correct, there is no restriction on the dimensions or datatypes.  There is no need to maintain different NDArrayPool instances.  The datatype and dimensions of an array from the pool are always reset to those requested.  If the memory in the existing array is sufficient it just uses that buffer, if not it frees and reallocates.

This means that there is potentially a small performance penalty because if the array data buffer found in the pool is too small it will free and allocate memory.  Over time all of the arrays in the pool will probably be sized to hold the largest array and then no more reallocation will be done.  

Mark

________________________________________
From: Pearson, Matthew R. [[email protected]]
Sent: Friday, September 23, 2016 7:41 AM
To: Mark Rivers
Cc: Hinxx; [email protected] list
Subject: Re: areaDetector plugin with multiple outputs

Hi Mark,

Am I right in thinking this should work with NDArrays of different data types or dimensions, at least if the driver or plugin maintained different NDArrayPool instances?

Cheers,
Matt

> On Sep 23, 2016, at 8:04 AM, Mark Rivers <[email protected]> wrote:
>
> Hi Hinko,
>
>> To answer my own question, I think the NDPluginTimeSeries::doTimeSeriesCallbacks() does what I'm after.
>
> Yes, that is correct.  Each NDArray callbacks is done with a different asyn "addr".  So the plugin must pass the flag ASYN_MULTIDEVICE in the constructor and downstream plugins must subscribe for callbacks using the appropriate "addr".
>
> This is a search to see what plugins call doCallbacksGenericPointer with a non-zero final argument:
>
> NDPluginCircularBuff.cpp:              doCallbacksGenericPointer(preBuffer_->readFromStart(), NDArrayData, 0);
> NDPluginCircularBuff.cpp:                doCallbacksGenericPointer(preBuffer_->readNext(), NDArrayData, 0);
> NDPluginCircularBuff.cpp:          doCallbacksGenericPointer(pArrayCpy, NDArrayData, 0);
> NDPluginColorConvert.cpp:    doCallbacksGenericPointer(this->pArrays[0], NDArrayData, 0);
> NDPluginFFT.cpp:    doCallbacksGenericPointer(pArrayOut, NDArrayData, 0);
> NDPluginFile.cpp:    doCallbacksGenericPointer(pArray, NDArrayData, 0);
> NDPluginFile.cpp:      doCallbacksGenericPointer(pArrayOut, NDArrayData, 0);
> NDPluginOverlay.cpp:    doCallbacksGenericPointer(this->pArrays[0], NDArrayData, 0);
> NDPluginProcess.cpp:        doCallbacksGenericPointer( pArrayOut, NDArrayData, 0);
> NDPluginROI.cpp:    doCallbacksGenericPointer(this->pArrays[0], NDArrayData, 0);
> NDPluginROIStat.cpp:      doCallbacksGenericPointer(pArrayOut, NDArrayData, 0);
> NDPluginStats.cpp:            doCallbacksGenericPointer(pArrayOut, NDArrayData, 0);
> NDPluginTimeSeries.cpp:    doCallbacksGenericPointer(pArrayOut, NDArrayData, numSignals_);
> NDPluginTimeSeries.cpp:      doCallbacksGenericPointer(pArray, NDArrayData, signal);
> NDPluginTransform.cpp:  doCallbacksGenericPointer(transformedArray, NDArrayData,0);
> NDPosPlugin.cpp:      doCallbacksGenericPointer(this->pArrays[0], NDArrayData, 0);
>
> So of the standard plugins in ADCore only NDPluginTimeSeries does this.
>
> Mark
>
> ________________________________
> From: [email protected] [[email protected]] on behalf of Hinxx [[email protected]]
> Sent: Friday, September 23, 2016 6:44 AM
> To: [email protected]
> Subject: Re: areaDetector plugin with multiple outputs
>
> To answer my own question, I think the NDPluginTimeSeries::doTimeSeriesCallbacks() does what I'm after.
>
> On 09/23/2016 10:41 AM, Hinxx wrote:
> Hi,
>
> I would like to have a single input array into areaDetector plugin and have the plugin deliver multiple arrays as output. Is this possible? Are there any examples?
> I would then like to feed the output arrays into other areaDetector plugins.
>
> Thanks,
> Hinko
>
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System