Experimental Physics and
Industrial Control System

Hi, all!

Im doing some proof of concepts with areaDetector cloned directly from master (commit 78fae55898b9028e756eb080367cd6aad8913b54) and the plugins together with EPICS_BASE 7.

When using the HDF5 plugin and saving with the capture mode, documentation (https://areadetector.github.io/master/ADCore/NDPluginFile.html?highlight=allocate) tells me a buffer will be allocated in memory before saving occurs. Consequently, when allocated buffer is bigger than available memory, application freezes my machine.

The thing is: after the saving occurs, the buffer doesnt seem to be de-allocated. I say that because htop shows memory usage growing continuously when acquire is happening with capture mode on, but memory usage does not decrease once saving is done. I tried using the <PREFIX>FlushNow PV but i only get this error:

epics> dbpf 13SIM2:HDF1:FlushNow 1 2023/05/03 20:35:34.577 13SIM2:HDF1:FlushNow devBusyAsyn::processCallbackOutput process error

Is this the correct usage of the PV? I also tried using <PREFIX>NumFramesFlush, but got no result.
Is there any recommended way i can de-allocate this buffer whenever i want? Until now, i need to restart the application every time i want my memory back.

Thanks in advance for any help,

Marco