the least EPICS_CA_MAX_ARRAY used for EIGER2 4M detector

[Zhibang Shen via Tech-talk <tech-talk at aps.anl.gov>]

Hi,

I am facing a problem with EPICS_CA_MAX_ARRAY_BYTES while using ADViewer monitoring Eiger2 4M detector.

I have followed the installation instruction of ADEiger and it works well. But if I set EPICS_CA_MAX_ARRAY_BYTES=10,000,000, ADViewer reports the exception of pendIO timed out. I also followed the troubleshooting to see whether all the configuration are properly set. The ArrayCallback PVs of cam1: and image1: are both set to Enable, and EPICS_CA_MAX_ARRAY is set to 40,000,000. I also tried EPICS_CA_MAX_ARRAY_BYTES=100,000,000 but it does not work either.

The pixel number of Eiger2 4M detector is 2068x2162=4,471,016. And the image bit depth is set to 32. I think the least EPICS_CA_MAX_ARRAY should be 2068x2162x4=17,884,064, then EPICS_CA_MAX_ARRAY_BYTES=40,000,000 should work. But it doesn't. I don't know why.

Could someone help me with this issue? Thanks in advance for any help.

Best regards,

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Zhibang Shen

Institute of High Energy Physics, Chinese Academy of Sciences

19B Yuquan Road, Shijingshan District, Beijing, China

100049