OS starts BOINC via boincmgr.exe /a /s
I want to pass additional argument to boinc client (--skip_cpu_benchmarks ). How to do this at boot time?

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Not via BOINC Manager (BM). I don't know why, but most of the arguments don't work through BM.

May I first ask why you don't want to run benchmarks?
Whatever the answer, a batch file is the way.

First make sure BM doesn't start at boot-up. Either change HKEY_CURRENT_USER\Software\Space Sciences Laboratory, U.C. Berkeley\BOINC Manager\DisableAutoStart to 1, or BOINC Manager->Advanced view->Options->Uncheck "Run Manager at login?"->OK.
Next change HKEY_CURRENT_USER\Software\Space Sciences Laboratory, U.C. Berkeley\BOINC Manager\AutomaticallyShutdownClient to 0 (zero).

Then make a batch file with in it:

@ECHO OFF
\path\to\BOINC executable directory\boinc.exe --skip_cpu_benchmarks --detach
\path\to\BOINC executable directory\boincmgr.exe

--detach will close the command line window, but will leave the client running.

Save the file and add a shortcut to it to your Windows StartUp folder.

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Thanks.
I want to disable benchmarks cause they are plain waste of computational time on my host. I participate in projects that don't need benchmarks.
Also I want to see uninterrupted run for ATI AstroPulse I developing now. AP tasks very rare these days and when even single task I managed to get was restarted because of benchmarking... it's annoying.

[Probably I could just edit registry entry that runs boincmgr.exe replacing boincmgr with boinc.exe with corresponding keys]

BTW, is it possible to put this and other command-line options in config file or they should always be specified as command line arguments only?

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Thanks.
I want to disable benchmarks cause they are plain waste of computational time on my host. I participate in projects that don't need benchmarks.
Also I want to see uninterrupted run for ATI AstroPulse I developing now. AP tasks very rare these days and when even single task I managed to get was restarted because of benchmarking... it's annoying.

[Probably I could just edit registry entry that runs boincmgr.exe replacing boincmgr with boinc.exe with corresponding keys]

BTW, is it possible to put this and other command-line options in config file or they should always be specified as command line arguments only?

Boinc 6.10.43 doesn't clear GPU memory during benchmarks, app just pauses while benchmark done.

Claggy

BTW, is it possible to put this and other command-line options in config file or they should always be specified as command line arguments only?

Nope, they are only available from the command line.

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