https://bugs.kde.org/show_bug.cgi?id=422336
--- Comment #13 from Martin Steigerwald <mar...@lichtvoll.de> ---
Strace output when maildir resources takes ages to complete a synchronization:
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 55
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 50
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 46
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 41
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 37
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2, 31
<unfinished ...>
[pid 7815] write(5, "\1\0\0\0\0\0\0\0", 8) = 8
[pid 7806] <... poll resumed>) = 1 ([{fd=5, revents=POLLIN}])
[pid 7806] read(5, "\1\0\0\0\0\0\0\0", 16) = 8
[pid 7806] poll([{fd=5, events=POLLIN}, {fd=13, events=POLLIN}], 2,
26^Cstrace: Process 7806 detached
<detached ...>
It goes on like that in rapid succession. 10 second statistic:
% timeout 10 strace -cp 7806
strace: Process 7806 attached
strace: Process 7806 detached
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
75,59 0,052635 32 1618 poll
24,25 0,016883 11 1531 read
0,16 0,000111 4 24 futex
0,00 0,000000 0 1 restart_syscall
------ ----------- ----------- --------- --------- ----------------
100.00 0,069629 3174 total
[…]/proc/7806> ls -l fd/5
lrwx------ 1 martin martin 64 Jun 9 13:57 fd/5 -> 'anon_inode:[eventfd]'
[…]/proc/7806> ls -l fd/13
lr-x------ 1 martin martin 64 Jun 9 13:57 fd/13 -> anon_inode:inotify
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