execution-time

问题 Is there a command in java to measure the execution time ? Something like System.out.println(execution.time); in the end of the code. 回答1: Here is a complete and little modified example on how you could do that: public class ExecutionTimer { private long start; private long end; public ExecutionTimer() { reset(); start = System.currentTimeMillis(); } public void end() { end = System.currentTimeMillis(); } public long duration(){ return (end-start); } public void reset() { start = 0; end = 0;

问题 I read my university class theoretically the order of growth of functions and tried implementing it practically at home. Although the order of growth turned out to be exact the same as in textbooks but their executing time changes with every single time I execute the program. Why is that? Source Code import time import math from tabulate import tabulate n=eval(input("Enter the value of n: ")); t1=time.time() a=12 t2=time.time() A=t2-t1 t3=time.time() b=n t4=time.time() B=t4-t3 t5=time.time()

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: how to get load time in milliseconds or microseconds in mysql I'm comparing a few different approaches to getting some data in mysql, directly at the console, using the SQL_NO_CACHE option to make sure mysql keeps running the full query every time. Mysql gives me the execution time back in seconds, to two decimal places. I'd really like to get the result back in milliseconds (ideally to one or two decimal places

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: how to get load time in milliseconds or microseconds in mysql I'm comparing a few different approaches to getting some data in mysql, directly at the console, using the SQL_NO_CACHE option to make sure mysql keeps running the full query every time. Mysql gives me the execution time back in seconds, to two decimal places. I'd really like to get the result back in milliseconds (ideally to one or two decimal places

问题 I am trying to use TimingLogger for checking time consumed for a particular method and its statements. But Android TimingLogger is not able to print logs. 回答1: If the Log.isLoggable is not enabled to at least the Log.VERBOSE level for that tag at creation time then the addSplit and dumpToLog call will do nothing. If you simply looking for logs as explained in https://developer.android.com, you will not be able to see logs. So use below command in adb: adb shell setprop log.tag.MyTag VERBOSE

问题 I am trying to use TimingLogger for checking time consumed for a particular method and its statements. But Android TimingLogger is not able to print logs. 回答1: If the Log.isLoggable is not enabled to at least the Log.VERBOSE level for that tag at creation time then the addSplit and dumpToLog call will do nothing. If you simply looking for logs as explained in https://developer.android.com, you will not be able to see logs. So use below command in adb: adb shell setprop log.tag.MyTag VERBOSE

问题 I've got a problem. I'm writing a benchmark and I have a function than is either done in 2 seconds or after ~5 minutes(depending on the input data). And I would like to stop that function if it's executed for more than 3 seconds... How can I do it? Thanks a lot! 回答1: The best way would be that your function can check its execution time often enough to decide to stop it it takes too long. If this is not the case, then run the function in a separate thread. In your main thread start a 3 seconds

问题 I try to track down an error in a R-script that does call a C++ program. The R tells me, that my C++ returned NA - but that does not seems to be the case when I look through the program. There is nothing called that would result in NA in R. Hence my question, if R may never capture the output from the C++ program, because return 0 is called before all output has been written to the console. My program does writes some numbers to the console. One number per line, the last line ends with endl .

问题 (related to Finding the lowest unused unique id in a list and Getting unused unique values on a SQL table) Suppose I have a table containing on id column and some others (they don't make any difference here): +-----+-----+ | id |other| +-----+-----+ The id has numerical increasing value. My goal is to get the lowest unused id and creating that row. So of course for the first time I run it will return 0 and the the row of this row would have been created. After a few executions it will look

问题 import sys import ttk from Tkinter import * from timeit import default_timer as timer def sum(a, b): for i in range(10): c = a + b print "Sum", c time.sleep(5) return c mGui = Tk() mGui.title('Progress') mpb = ttk.Progressbar(mGui,orient ="horizontal", length = 200, mode ="determinate") mpb.pack() mpb.start() mpb["maximum"] = 100 Start_Timer=timer() sum(3,4) Stop_Timer=timer() Execution_Time=Stop_Timer-Start_Timer mpb["value"] = Execution_Time mGui.mainloop() I have a function which