Collatz testing in 4c/8t i7-3770 system
Run Time CPU Time Credit
301.72 4.97 30,903.39
311.19 4.73 32,869.79
311.57 4.59 31,015.35
277.69 11.88 30,968.73
333.21 18.30 32,658.67

Using this config and app_config.xml...
verbose=1
kernels_per_reduction=48
threads=8
lut_size=17
sleep=1
reduce_cpu=0
sieve_size=28

<app_config>
<project_max_concurrent>1</project_max_concurrent>
<app>
<name>collatz_sieve</name>
<gpu_versions>
<gpu_usage>1</gpu_usage>
<cpu_usage>1</cpu_usage>
</gpu_versions>
</app>
</app_config>