ARGOMENTO:

#!/bin/bash

nthreads=$(nproc)
xmledit="xmlstarlet ed --inplace"
boinccmd=boinccmd #./boinccmd
path_boinc_client=/your/path/to/boinc
prefsXml=global_prefs_override.xml
cd $path_boinc_client

while true
do
	FoldingRunning=$(pgrep FahCore_22 >/dev/null && echo 1 || echo 0)
	QuarantineRunning=$(pgrep autodock_gpu_32 >/dev/null && echo 1 || echo 0)
	if [ $FoldingRunning -eq 1 -o $QuarantineRunning -eq 1 ]
	then
		echo "Folding/Quarantine running"
		pct=$(echo "scale=6; 100*($nthreads-1)/$nthreads" | bc | awk '{printf "%.6f\n", $0}')
		$xmledit -u '/global_preferences/max_ncpus_pct' -v $pct $prefsXml
		sed -e '/^<?xml/d' $prefsXml > $prefsXml.tmp && mv $prefsXml.tmp $prefsXml
		echo "Setting "$(echo "scale=1;$pct/1" | bc)"% BOINC CPUs"
		$boinccmd --read_global_prefs_override
		echo "Suspending BOINC GPU"
		$boinccmd --set_gpu_mode never
	else
		echo "No other GPU DC projects running"
		pct="100.000000"
		$xmledit -u '/global_preferences/max_ncpus_pct' -v $pct $prefsXml
		sed -e '/^<?xml/d' $prefsXml > $prefsXml.tmp && mv $prefsXml.tmp $prefsXml
		echo "Setting "$(echo "scale=1;$pct/1" | bc)"% BOINC CPUs"
		$boinccmd --read_global_prefs_override
		echo "Resuming BOINC GPU"
		$boinccmd --set_gpu_mode always #auto
	fi
	sleep 300
done

The command-line options for boinc are intended for debugging.
The recommended command-line interface is a separate program,'boinccmd'.
Run boinccmd in the same directory as boinc.

Usage: boinc [options]
    --abort_jobs_on_exit           when client exits, abort and report jobs
    --allow_remote_gui_rpc         allow remote GUI RPC connections
    --allow_multiple_clients       allow >1 instances per host
    --attach_project <URL> <key>   attach to a project
    --check_all_logins             for idle detection, check remote logins too
    --daemon                       run as daemon (Unix)
    --detach_console               detach from console (Windows)
    --detach_project <URL>         detach from a project
    --dir <path>                   use given dir as BOINC home
    --exit_after_app_start N       exit N seconds after an app starts
    --exit_after_finish            exit right after finishing a job
    --exit_before_start            exit right before starting a job
    --exit_before_upload           exit right before starting an upload 
    --exit_when_idle               exit when there are no results
    --fetch_minimal_work           fetch only 1 job per device
    --file_xfer_giveup_period N    give up on file xfers after N sec
    --gui_rpc_port <port>          port for GUI RPCs
    --gui_rpc_unix_domain          use Unix domain for GUI RPCs
    --help                         show options
    --insecure                     disable app sandboxing (Unix)
    --master_fetch_interval N      limiting period of master retry
    --master_fetch_period N        reload master URL after N RPC failures
    --master_fetch_retry_cap N     exponential backoff limit
    --no_gpus                      don't check for GPUs
    --no_gui_rpc                   don't allow GUI RPC, don't make socket
    --no_info_fetch                don't fetch project list or client version info
    --no_priority_change           run apps at same priority as client
    --pers_giveup N                giveup time for persistent file xfer
    --pers_retry_delay_max N       max for file xfer exponential backoff
    --pers_retry_delay_min N       min for file xfer exponential backoff
    --redirectio                   redirect stdout and stderr to log files
    --reset_project <URL>          reset (clear) a project
    --retry_cap N                  exponential backoff limit
    --run_cpu_benchmarks           run the CPU benchmarks
    --run_by_updater               set by updater
    --sched_retry_delay_max N      max for RPC exponential backoff
    --sched_retry_delay_min N      min for RPC exponential backoff
    --show_projects                show attached projects
    --skip_cpu_benchmarks          don't run CPU benchmarks
    --start_delay X                delay starting apps for X secs
    --suppress_net_info            don't send network addrs to server
    --unsigned_apps_ok             allow unsigned apps (for testing)
    --update_prefs <URL>           contact a project to update preferences
    --version                      show version info