Here is imapsync 1.977 on host staging, a linux system with 8.9/15.7 free GiB of RAM
with Perl 5.26.1 and Mail::IMAPClient 3.42
Transfer started at Mon Jun 19 17:52:54 2023
PID is 32321 my PPID is 32320
Log file is LOG_imapsync/2023_06_19_17_52_54_706_user01@ox.zepto.international_user3@ox.zepto.international.txt ( to change it, use --logfile path ; or use --nolog to turn off logging )
Load is 0.05 0.23 0.31 1/593 on 6 cores
Current directory is /var/www/html/email-migraton-services
Real user id is contabo (uid 1000)
Effective user id is contabo (euid 1000)
$RCSfile: imapsync,v $ $Revision: 1.977 $ $Date: 2019/12/23 20:18:02 $ 
Command line used, run by /usr/bin/perl:
/usr/bin/imapsync --host1 sm01.eastasia.cloudapp.azure.com --user1 user01@ox.zepto.international --password1 MASKED --host2 imap.ox.io --user2 user3@ox.zepto.international --password2 MASKED --ssl2 --maxage 5
Temp directory is /tmp ( to change it use --tmpdir dirpath )
kill -QUIT 32321 # special behavior: call to sub catch_exit
kill -TERM 32321 # special behavior: call to sub catch_exit
kill -INT 32321 # special behavior: call to sub catch_reconnect
kill -HUP 32321 # special behavior: call to sub catch_print
kill -USR1 32321 # special behavior: call to sub toggle_sleep
File /tmp/imapsync.pid does not exist
PID file is /tmp/imapsync.pid ( to change it, use --pidfile filepath ; to avoid it use --pidfile "" )
Could not open /tmp/imapsync.pid for writing. Check permissions or disk space: No such file or directory
Exiting with return value 8 (EXIT_PID_FILE_ERROR) 0/50 nb_errors/max_errors