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Any tips on debugging techniques for out of memory?

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  • undefined
    dc42 administrators @DonStauffer
    last edited by 31 Jul 2024, 05:51

    @DonStauffer yes that's the one. It's the same as Never Used RAM in the M122 report.

    Duet WiFi hardware designer and firmware engineer
    Please do not ask me for Duet support via PM or email, use the forum
    http://www.escher3d.com, https://miscsolutions.wordpress.com

    undefined 1 Reply Last reply 31 Jul 2024, 05:52 Reply Quote 0
    • undefined
      DonStauffer @dc42
      last edited by 31 Jul 2024, 05:52

      @dc42 Thanks. I'll look at it, though my immediate problem seems to be solved. But undoubtedly I'll run out of memory again at some point. But I'm pretty happy now.

      undefined 1 Reply Last reply 31 Jul 2024, 05:53 Reply Quote 0
      • undefined
        dc42 administrators @DonStauffer
        last edited by 31 Jul 2024, 05:53

        @DonStauffer I'd be interested to know whether you have less or more free memory after running a print with 3.6 alpha compared to 3.5.2.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        undefined 2 Replies Last reply 31 Jul 2024, 05:54 Reply Quote 0
        • undefined
          DonStauffer @dc42
          last edited by 31 Jul 2024, 05:54

          @dc42 I'm a little afraid to install an alpha though. Is reverting easy?

          undefined 1 Reply Last reply 31 Jul 2024, 06:02 Reply Quote 0
          • undefined
            dc42 administrators @DonStauffer
            last edited by 31 Jul 2024, 06:02

            @DonStauffer assuming you are running in standalone mode not SBC mode, reverting is very easy. To make it even easier you can install just the 3.6 Duet2CombinedFirmware.bin file and continue running DWC 3.5.2. You can ignore the warning about incompatible software versions in this case.

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

            undefined 1 Reply Last reply 1 Aug 2024, 00:05 Reply Quote 0
            • undefined
              gloomyandy @DonStauffer
              last edited by 31 Jul 2024, 07:01

              @DonStauffer Just running M122 in the console should provide an idea of what the memory situation is before the print starts and after your startup code has run.

              undefined 1 Reply Last reply 31 Jul 2024, 23:59 Reply Quote 0
              • undefined
                DonStauffer @gloomyandy
                last edited by 31 Jul 2024, 23:59

                @gloomyandy Echoing boards[0].freeRam at various places throughout a small, 15 minute, 8-layer print job with tool changes, it looks like this (no units given; bytes?):

                Machine turn-on: 8544
                Partway through job startup: 8520
                Before purge in job startup: 4000
                After purge: 920
                Beginning of Layer 1: 920
                Layer 2: 848
                Layer 3: 848
                Layer 4: 848
                Layer 5: 848
                Layer 5 before tool change: 464
                Layer 6: 72
                Layer 6 before tool change: 72
                Layer 7: 72
                Layer 7 before tool change: 72
                Layer 8: 72
                Layer 8 before tool change: 72
                After job finished: 72

                It seems like I'm grazing the treetops. Most of my global data is created from config.g, so I'm not really sure why my startup script uses so much memory compared to the job proper.

                1 Reply Last reply Reply Quote 0
                • undefined
                  DonStauffer @dc42
                  last edited by 1 Aug 2024, 00:05

                  @dc42 OK, I'll do that. I have the details on free memory echoing throughout a job and I recorded them. So I'll have something to compare it with.

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    DonStauffer @dc42
                    last edited by 1 Aug 2024, 00:39

                    @dc42 Same GCode file as the free RAM I posted for RRF 3.5.2, but after installing 3.6 alpha 2:

                    After upgrade: 22624
                    I couldn't believe that so I did an M999 and looked again: 22600 (where are my 24 bytes?)
                    Partway through job startup: 22600
                    Before purge in job startup: 16840
                    After purge: 14472
                    Beginning of Layer 1: 14472
                    Layer 2: 14472
                    Layer 3: 14304
                    Layer 4: 14280
                    Layer 5: 14280
                    Layer 5 before tool change: 13512
                    Layer 6: 13096
                    Layer 6 before tool change: 13096
                    Layer 7: 13096
                    Layer 7 before tool change: 13096
                    Layer 8: 13096
                    Layer 8 before tool change: 13096
                    After job finished: 13096

                    What wizardry is this?!

                    undefined 1 Reply Last reply 1 Aug 2024, 04:41 Reply Quote 0
                    • undefined
                      oliof @DonStauffer
                      last edited by 1 Aug 2024, 04:41

                      @DonStauffer probably the work noted at https://github.com/Duet3D/RepRapFirmware/blob/bd8d9119d49ba425864f2280b005875b368746c0/src/Todo-next.txt#L25

                      <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

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