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70 lines
2.7 KiB
Plaintext
70 lines
2.7 KiB
Plaintext
#!/bin/cat
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$Id: FAQ.Memory.txt,v 1.8 2018/08/31 13:29:53 gilles Exp gilles $
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This document is also available online at
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https://imapsync.lamiral.info/FAQ.d/
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https://imapsync.lamiral.info/FAQ.d/FAQ.Memory.txt
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=======================================================================
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Imapsync tips about memory issues.
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=======================================================================
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=======================================================================
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Q. I got an "Out of memory" error message then imapsync crashes.
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How to fix that?
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R0. Add option --debugmemory to debug memory issues.
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On Windows this option uses a DOS command similar to:
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tasklist /NH /FO CSV | findstr imapsync
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On Unix it uses:
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ps -o vsz -p PID_of_imapsync # value is in KB
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Similar to:
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ps -ax -o vsz,comm | grep imapsync
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Use those commands in a DOS window or a Unix shell in order
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to monitor a imapsync run you know it will crash.
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The goal is to detect the memory limit, when and how it happens.
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* Is the "final" amount near the total RAM available or
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just a small part of it?
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* Does the rise of memory consumption happens suddenly
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or along the sync?
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R1. It's probably a very big message on the host1 account.
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Before imapsync release 1.688 memory usage is at least 5 times
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the biggest message size. then 2 times with release 1.688.
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So a 700 MB message will crunch 3.5 GB of memory.
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Starting with 1.688 it will crunch 1.4 GB of memory.
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R2. To check if the problem is a big message crunching to much
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memory, add --maxsize 50_000_000, this will limit the message
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size treated to 50 MB. If the sync succeed while limiting
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messages sizes it's probably is a big message crunching to much
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memory issue. Possible solutions:
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* Try on another host
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* Buy memory
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* Build imapsync.exe binary 64bits
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R3. If R2 shows that the memory issue is not a big message crunching
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too much memory, then it can be imapsync using too much memory
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to identify messages (a very big folder served by a
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very talkative imap server). A possible solution is to use
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the option --useuid. If it still fails, I have no clue.
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If you have time, drop me a note.
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R4. Usually "Out of memory" errors are related to old days,
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to old Mail::IMAPClient module releases, before 3.26.
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At that time memory usage was around 17 times the biggest message.
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Look at imapsync output first lines to get the Mail::IMAPClient
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release used. Then upgrade Mail::IMAPClient Perl module if needed.
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=======================================================================
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=======================================================================
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