This thread is over four years old, and it still annoys me that the accepted answer criticizes the question rather than answering it. There are many valid reasons you would want to limit the CPU time taken by your program, I can list a few off the top of my head. It might seem like … Read more
If a profiler is not applicable in your setup, you may try to identify the thread following steps in this post. Basically, there are three steps: run top -H and get PID of the thread with highest CPU. convert the PID to hex. look for thread with the matching HEX PID in your thread dump.
GNU Coreutils includes the timeout command, installed by default on many systems. https://www.gnu.org/software/coreutils/manual/html_node/timeout-invocation.html To watch free -m for one minute, then kill it by sending a TERM signal: timeout 1m watch free -m
Update, Spring 2018: I wrote this response in 2010 and since then, a whole lot of things have changed in the world of a web backend developer. Namely, the advent of the “cloud” turning services such as one-click load balancers and autoscaling into commodities have made the actual mechanics of scaling your application much easier … Read more
I use this function to calculate cpu usage. Hope it can help you. private float readUsage() { try { RandomAccessFile reader = new RandomAccessFile(“/proc/stat”, “r”); String load = reader.readLine(); String[] toks = load.split(” +”); // Split on one or more spaces long idle1 = Long.parseLong(toks[4]); long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[5]) + Long.parseLong(toks[6]) … Read more
Diagnosing In terms of diagnosing what App Pool is causing trouble, you can: Select the server Go to IIS > Worker Processes This should bring up a menu like this so you can determine which App Pool is running amok. From there you can simply restart the the app pool and 9 times out of … Read more
From this post: To get the entire PC CPU and Memory usage: using System.Diagnostics; Then declare globally: private PerformanceCounter theCPUCounter = new PerformanceCounter(“Processor”, “% Processor Time”, “_Total”); Then to get the CPU time, simply call the NextValue() method: this.theCPUCounter.NextValue(); This will get you the CPU usage As for memory usage, same thing applies I believe: … Read more
According the htop source code, my assumptions looks like they are valid: (see static inline double LinuxProcessList_scanCPUTime(LinuxProcessList* this) function at LinuxProcessList.c) // Guest time is already accounted in usertime usertime = usertime – guest; # As you see here, it subtracts guest from user time nicetime = nicetime – guestnice; # and guest_nice from nice … Read more
This query uses DMV’s to identify the most costly queries by CPU SELECT TOP 20 qs.sql_handle, qs.execution_count, qs.total_worker_time AS Total_CPU, total_CPU_inSeconds = –Converted from microseconds qs.total_worker_time/1000000, average_CPU_inSeconds = –Converted from microseconds (qs.total_worker_time/1000000) / qs.execution_count, qs.total_elapsed_time, total_elapsed_time_inSeconds = –Converted from microseconds qs.total_elapsed_time/1000000, st.text, qp.query_plan FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st CROSS APPLY sys.dm_exec_query_plan … Read more
There’s a special task called the idle task that runs when no other task can be run. The % usage is just the percentage of the time we’re not running the idle task. The OS will keep a running total of the time spent running the idle task: when we switch to the idle task, … Read more