Nuwan Senanayake

you might experience a slow performance in ubuntu 16.04 after resuming back from a sleep or hibernate. reason for this is it doesn't move away from powersave mode automatically. intel_pstate driver is the one making this problem, so we have to disable it and use acpi-cpufreq  driver. first lets check weather your competer is on powersave.  cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor If your answer is powersave we have to move it to performance state. get your cpu info by cat /proc/cpuinfo | grep MHz  probabaly you seeing 4 cores lets update scaling governers     echo 'performance' > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor     echo 'performance' > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor     echo 'performance' > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor     echo 'performance' > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor now your computer running as

These days I am working on a task to improve the performance of a wso2telco analytics which is based wso2 DAS. Our product does data summarizing using apache spark. When the data increases it hangs even though we have applied wso2 incremental processing. Hence we decided to do one level data summarizing on real time as soon as data arrives at wso2 siddhi event processor. spark will do summarize per hour while siddhi will summarize per minute. To summarize data in real time we can use siddhi window feature. it can hold the events arrived up to a specified time and then release all the accumulated events at once. Since the events received are released at once we can use summarizing methods to summarize them. Following describes few attempts how I  tried to do this. Attempt 01 This was the attempt suggested by wso2 support team https://github.com/wso2/analytics-apim/blob/master/features/org.wso2.analytics.apim.feature/src/main/resources/template-manager/executionplans/APIMAn