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What is using heavy CPU ?

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    #1

    What is using heavy CPU ?

    I monitor CPU usage. I have a WEB/SQL that has a lot of components. 70 remote users. 200 tablets.

    SOMETHING is running for 1-2 minutes with really heavy CPU.

    I get the log message below, but if I could find what Grid or UX is the source, I can find/fix the CPU punishment.

    It is not (yet) hurting the users and it is relatively rare.

    HOW CAN I DETECT WHAT COMPONENT IS BURNING CPU TIME? Jiving it with the Access.Log is inconclusive.

    SQL time is low, but Alpha Server time pins the meter for about 2 minutes.



    This it my XBasic.Txt from the Server (Current AppServer release as of today.)
    =================================================================
    Thu Feb 09 11:14:48 2017
    Thread priority reduced.
    Thread was busy 95% of the last 20 seconds.
    Raw Data: 326522180251717,89934576,326522305631490,91837787,2006076,1903211,20047877,19094522
    The script causing this behavior is using a lot of CPU time.
    You may want to review the page to make sure you have optimized any XBasic scripting.
    Long running and processor intensive scripts tend to tie up available threads and adversely affect the perceived performance for multiple users.


    Execution Stack:
    0#1 evaluate_shared_private(
    0#37 OOhttpdServerClientMIME(ptemp,"AppServerMain")
    0#2 A5WCallResult = evaluate_a5w_to_response(page_contents,Response,quote(" " + eval_settings.global.Request.ScriptName),eval_settings,EVALUATE_A5W_TIMEOUT,RequestBundle.RequestInfo.Filename.Path)
    0#180 x_out = a5_ajax_dialog2(tmpl)
    ==========================================================
    Thu Feb 09 11:15:08 2017
    Thread priority restored to normal after being lowered for 20 seconds due to heavy usage.


    Execution Stack:
    0#1 evaluate_shared_private(
    0#37 OOhttpdServerClientMIME(ptemp,"AppServerMain")
    0#2 A5WCallResult = evaluate_a5w_to_response(page_contents,Response,quote(" " + eval_settings.global.Request.ScriptName),eval_settings,EVALUATE_A5W_TIMEOUT,RequestBundle.RequestInfo.Filename.Path)
    0#180 x_out = a5_ajax_dialog2(tmpl)
    ==========================================================
    Carl ~ Dallas, TX
    I'm so old that pool balls came with Roman Numerals
    Tags: None
    #2
    Re: What is using heavy CPU ?

    Certainly someone else has CPU challenges now and then.

    What is a good way to determine what it so intense on CPU?

    Again rare, but as I use AlwaysUp, I''d rather fix it than have AlwaysUp restart AppServer.
    Carl ~ Dallas, TX
    I'm so old that pool balls came with Roman Numerals

    Comment

      #3
      Re: What is using heavy CPU ?

      In your build are you calling a child component from the parent to refresh a child List in a UX?
      Insanity: doing the same thing over and over again and expecting different results.
      Albert Einstein, (attributed)
      US (German-born) physicist (1879 - 1955)

      Comment

        #4
        Re: What is using heavy CPU ?

        No, and I'm not sure if it is a grid or a UX.

        I have 70 users and 200 tablets and something one or more of them are doing hits the CPU for about 20-25 seconds at 95%+.

        All I'd love to see is a clue to the component that's having all the fun.

        Instead of:
        The script causing this behavior is using a lot of CPU time.
        You may want to review the page to make sure you have optimized any XBasic scripting.

        I'd love:
        A script executed by "grid_Transactions_guidguidguidguid" is causing this behavior is using a lot of CPU time.
        You may want to review the page to make sure you have optimized any XBasic scripting.
        Carl ~ Dallas, TX
        I'm so old that pool balls came with Roman Numerals

        Comment

          #5
          Re: What is using heavy CPU ?

          You can turn on the HTTP Raw log and match the time stamp in the xbasic error log to the timestamp in the raw log header and then get the name of the component from the query string in the body. The error indicated it is in a UX component, so look for the value in the query string for "__dialogFilename"

          You have not indicated what build you are using. The latest release builds have changes to reduce the memory footprint and CPU load, particularly when using UX. If you have a lot of UX, you should consider pre-render. Not only is it significantly faster, it reduces processor load.

          However, if the 70 users and 200 mobile users are moderate to heavy users, it is very likely the system is in overload. In overload, almost any request could push the CPU to 100%. If you have the access log on, you can get a rough measure of load using the function "a5w_analyzewebaccesslogs()". This will calculate and chart the number of requests and can be run from the server interactive window. Most systems will begin to slow in the 150 requests per minute range, although there can be significant differences between applications based on design.

          Comment

            #6
            Re: What is using heavy CPU ?

            I just turned on HTTP logging last evening in hope of just that!

            Developer and AppServer builds are current as of today, but I have not republished all components.

            I republished a few components and one of them acted very different even though I merely changed some styling. A little unnerving.

            All of the users are light. A tablet does 3 to 5 transactions a day, and the Web users are light, too.

            I watch the Resource Monitor and other than Mister HOG, who goes 20-30 seconds at 95-100%, the graph is mere blips here and there and generally floating along at 3-5%.

            SPEAKING OF THE DEVIL, the graph is showing Mister HOG is at work, and so I ... never mind, false alarm.

            If the HTTP log will ID the possible culprit, I can take it from there.
            Carl ~ Dallas, TX
            I'm so old that pool balls came with Roman Numerals

            Comment

              #7
              Re: What is using heavy CPU ?

              You need to be careful using pre-release... I have had issues with the last 3.. so tread your own path, but there are is a risk as the download page warns... just saying..
              Insanity: doing the same thing over and over again and expecting different results.
              Albert Einstein, (attributed)
              US (German-born) physicist (1879 - 1955)

              Comment

                #8
                Re: What is using heavy CPU ?

                I don't use pre-release. I'm current at Build 4119 both Dev and AppServer.

                My guess d' jour is that I have a PhoneGap app that will synchronize a large list.

                From the HTTP log I saw one user send a 3-meg transaction which looks to be a full list.

                I've Identified the tablet and will be looking for others that might be similarly inclined.

                I damn well will improve my "who is doing what & when" logging data in the next release of the tablet software.

                It looks like I will be reading HTTP logs for a few days. Sigh.
                Carl ~ Dallas, TX
                I'm so old that pool balls came with Roman Numerals

                Comment

                  #9
                  Re: What is using heavy CPU ?

                  Good ..
                  Insanity: doing the same thing over and over again and expecting different results.
                  Albert Einstein, (attributed)
                  US (German-born) physicist (1879 - 1955)

                  Comment

                    #10
                    Re: What is using heavy CPU ?

                    HTTP logs aren't telling me anything particularly useful.

                    XBasic log says essentially " .... something is using CPU, you might want to make the script run better." No S**t Sherlock!

                    AlwaysUp will restart the AppServer after 15 minutes of 95%+ CPU usage. There is NOTHING going on that should last over 2 or 3 seconds, and most should be a mere blip.

                    Frustrated to the max.
                    Carl ~ Dallas, TX
                    I'm so old that pool balls came with Roman Numerals

                    Comment

                      #11
                      Re: What is using heavy CPU ?

                      Ask Selwyn directly - if its possible for the message to name the process.
                      Insanity: doing the same thing over and over again and expecting different results.
                      Albert Einstein, (attributed)
                      US (German-born) physicist (1879 - 1955)

                      Comment

                        #12
                        Re: What is using heavy CPU ?

                        this line is specific, 'to make sure you have optimized any XBasic scripting' could be a clue, it may not be your xbasic, it may be the systems.
                        Insanity: doing the same thing over and over again and expecting different results.
                        Albert Einstein, (attributed)
                        US (German-born) physicist (1879 - 1955)

                        Comment

                          #13
                          Re: What is using heavy CPU ?

                          Will do. But I turned OFF HTTP logging and much of my CPU load faded away!
                          I'd consider jumping off a cliff, but there aren't many cliffs in Dallas.

                          I do think it is probable that it is system XBasic routines; I just can't identify who is sucking up all the suds.

                          One discovered culprit is an older PhoneGap app without any embedded (dynamically loaded) UX components and it seems to slam the CPU.

                          I promise I'll share anything definitive I encounter. I believe there is more than one thief.

                          G'day, mate to All Y'All!
                          Carl ~ Dallas, TX
                          I'm so old that pool balls came with Roman Numerals

                          Comment

                            #14
                            Re: What is using heavy CPU ?

                            It's well documented that the logging has a hefty load (may be the xbasic I was suggesting) and should only be used when necessary..
                            Insanity: doing the same thing over and over again and expecting different results.
                            Albert Einstein, (attributed)
                            US (German-born) physicist (1879 - 1955)

                            Comment

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