Posted by jpluimers on 2019/02/14
Interesting read [WayBack] Mysterious Case Of Wrong Value.
In order to capture by value (which in C++ you can specify), you need an intermediate function like Dalija describes:
function CreateFunction(Value: Integer): TFunc<Integer>;
begin
Result :=
function: Integer
begin
Result := Value;
end;
end;
Via: [WayBack] Dalija Prasnikar – Google+
–jeroen
Posted in Delphi, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2019/02/14
In the mean time I’ve made a bit of progress on btrfs free space. It’s complicated. Still.
Let me start with an example system that has details further below.
btrfs quota rescan /In short: the used 6.6 Gibibyte (which matches 6.9 Gigabyte) does not match the 11 Gibibyte. A situation very similar to [WayBack] Disk usage is more than double the snapshots exclusive data — Linux BTRFS.
Reminder to self: try
bedupthat is supposed to deduplicate btrfs data: [WayBack] Re: Disk usage is more than double the snapshots exclusive data — Linux BTRFS
- Repository g2p/bedup: Btrfs deduplication
- Not sure which package is needed (
bedup,python3-bedupnorburpare found)
I need to check out on de-duplication (as I know this particular machine has quite a bit of duplicate data).
But first lets get the size down a bit with this series of commands:
sftp-host:~ # btrfs balance start -dusage=0 -musage=0 /
Done, had to relocate 0 out of 18 chunks
sftp-host:~ # btrfs balance start -dusage=10 -musage=10 /
Done, had to relocate 1 out of 18 chunks
sftp-host:~ # btrfs balance start -dusage=20 -musage=20 /
Done, had to relocate 1 out of 18 chunks
sftp-host:~ # btrfs balance start -dusage=30 -musage=30 /
Done, had to relocate 2 out of 18 chunks
sftp-host:~ # btrfs balance start -dusage=40 -musage=40 /
Done, had to relocate 1 out of 17 chunks
sftp-host:~ # btrfs balance start -dusage=50 -musage=40 /
Done, had to relocate 2 out of 17 chunks
sftp-host:~ # btrfs balance start -dusage=60 -musage=40 /
Done, had to relocate 2 out of 17 chunks
sftp-host:~ # btrfs balance start -dusage=60 -musage=60 /
sftp-host:~ # btrfs filesystem show
Label: none uuid: 6492a1c6-5fbc-4938-bf11-57d6194e6b8f
Total devices 1 FS bytes used 6.61GiB
devid 1 size 10.00GiB used 8.88GiB path /dev/sda2
sftp-host:~ # btrfs filesystem df /
Data, single: total=7.82GiB, used=6.35GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=512.00MiB, used=263.47MiB
GlobalReserve, single: total=22.67MiB, used=0.00B
Compare this to the initial situation:
sftp-host:~ # btrfs filesystem show
Label: none uuid: 6492a1c6-5fbc-4938-bf11-57d6194e6b8f
Total devices 1 FS bytes used 6.61GiB
devid 1 size 10.00GiB used 10.00GiB path /dev/sda2
sftp-host:~ # btrfs filesystem df /
Data, single: total=8.94GiB, used=6.35GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=512.00MiB, used=264.27MiB
GlobalReserve, single: total=23.48MiB, used=0.00B
Now you see that:
Continue with steps closer to 99 (which is a percentage) and if that succeeds try this:
btrfs balance start --full-balance /
In my experience it needs at least 60% free dh -f disk space to run to completion. If it fails, it’s no problem: it merges the final almost full blocks. But those blocks will be split soon anyway because of file system write activity.
You can even get a nicer view by executing btrfs filesystem usage -T / (which I did after continuing up to 99):
Overall:
Device size: 10.00GiB
Device allocated: 8.22GiB
Device unallocated: 1.78GiB
Device missing: 0.00B
Used: 7.00GiB
Free (estimated): 2.72GiB (min: 1.83GiB)
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 24.55MiB (used: 48.00KiB)
Data Metadata System
Id Path single DUP DUP Unallocated
-- --------- ------- --------- -------- -----------
1 /dev/sda2 7.41GiB 768.00MiB 64.00MiB 1.78GiB
-- --------- ------- --------- -------- -----------
Total 7.41GiB 384.00MiB 32.00MiB 1.78GiB
Used 6.47GiB 269.88MiB 16.00KiB
Three things to try now:
-dusage and -musage.-dusage and -musage in different btrfs balance start commands.
sftp-host:~ # df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 176M 0 176M 0% /dev
tmpfs 182M 0 182M 0% /dev/shm
tmpfs 182M 868K 181M 1% /run
tmpfs 182M 0 182M 0% /sys/fs/cgroup
/dev/sda2 11G 6.9G 2.6G 73% /
/dev/sda2 11G 6.9G 2.6G 73% /var/spool
/dev/sda2 11G 6.9G 2.6G 73% /tmp
/dev/sda2 11G 6.9G 2.6G 73% /boot/grub2/i386-pc
/dev/sda2 11G 6.9G 2.6G 73% /boot/grub2/x86_64-efi
/dev/sda2 11G 6.9G 2.6G 73% /var/crash
/dev/sda2 11G 6.9G 2.6G 73% /var/lib/named
/dev/sda2 11G 6.9G 2.6G 73% /var/opt
/dev/sda2 11G 6.9G 2.6G 73% /var/lib/mailman
/dev/sda2 11G 6.9G 2.6G 73% /var/tmp
/dev/sda2 11G 6.9G 2.6G 73% /var/log
/dev/sda2 11G 6.9G 2.6G 73% /var/lib/pgsql
/dev/sda2 11G 6.9G 2.6G 73% /var/lib/machines
/dev/sda2 11G 6.9G 2.6G 73% /srv
/dev/sda2 11G 6.9G 2.6G 73% /usr/local
/dev/sda2 11G 6.9G 2.6G 73% /opt
/dev/sda2 11G 6.9G 2.6G 73% /.snapshots
/dev/sda3 5.5G 36M 5.5G 1% /home
tmpfs 37M 0 37M 0% /run/user/1000
sftp-host:~ # btrfs filesystem show
Label: none uuid: 6492a1c6-5fbc-4938-bf11-57d6194e6b8f
Total devices 1 FS bytes used 6.61GiB
devid 1 size 10.00GiB used 10.00GiB path /dev/sda2
sftp-host:~ # btrfs filesystem df /
Data, single: total=8.94GiB, used=6.35GiB
System, DUP: total=32.00MiB, used=16.00KiB
Metadata, DUP: total=512.00MiB, used=264.27MiB
GlobalReserve, single: total=23.48MiB, used=0.00B
sftp-host:~ # btrfs qgroup show /
qgroupid rfer excl
-------- ---- ----
0/5 16.00KiB 16.00KiB
0/257 1.05MiB 1.05MiB
0/258 2.55GiB 51.11MiB
0/259 2.36MiB 2.36MiB
0/260 16.00KiB 16.00KiB
0/261 16.00KiB 16.00KiB
0/262 16.00KiB 16.00KiB
0/263 36.00KiB 36.00KiB
0/264 16.00KiB 16.00KiB
0/265 16.00KiB 16.00KiB
0/266 16.00KiB 16.00KiB
0/267 16.00KiB 16.00KiB
0/268 16.00KiB 16.00KiB
0/269 533.83MiB 533.83MiB
0/270 16.00KiB 16.00KiB
0/271 48.00KiB 48.00KiB
0/272 16.00KiB 16.00KiB
0/289 16.00KiB 16.00KiB
0/401 2.80GiB 396.91MiB
0/402 2.55GiB 9.57MiB
0/403 2.55GiB 12.91MiB
0/404 2.54GiB 676.00KiB
0/405 2.54GiB 660.00KiB
0/406 2.81GiB 60.34MiB
0/407 2.55GiB 8.66MiB
0/408 2.55GiB 4.57MiB
0/409 2.56GiB 24.31MiB
0/410 2.55GiB 7.28MiB
0/411 2.57GiB 20.55MiB
255/289 16.00KiB 16.00KiB
sftp-host:~ # !~
~/Versioned/btrfs-size/btrfs-size.sh
===============================================================================================
Snapshot / Subvolume ID Total Exclusive Data
===============================================================================================
257 gen 505741 top level 5 path .snapshots 257 1.05MB 1.05MB
258 gen 505796 top level 257 path .snapshots/1/snapshot 258 2.55GB 51.11MB
259 gen 505736 top level 5 path boot/grub2/i386-pc 259 2.36MB 2.36MB
260 gen 452028 top level 5 path boot/grub2/x86_64-efi 260 16.00KB 16.00KB
261 gen 452028 top level 5 path opt 261 16.00KB 16.00KB
262 gen 505720 top level 5 path srv 262 16.00KB 16.00KB
263 gen 505791 top level 5 path tmp 263 36.00KB 36.00KB
264 gen 505717 top level 5 path usr/local 264 16.00KB 16.00KB
265 gen 452028 top level 5 path var/crash 265 16.00KB 16.00KB
266 gen 452028 top level 5 path var/lib/mailman 266 16.00KB 16.00KB
267 gen 452028 top level 5 path var/lib/named 267 16.00KB 16.00KB
268 gen 452028 top level 5 path var/lib/pgsql 268 16.00KB 16.00KB
269 gen 505795 top level 5 path var/log 269 533.83MB 533.83MB
270 gen 452028 top level 5 path var/opt 270 16.00KB 16.00KB
271 gen 505796 top level 5 path var/spool 271 48.00KB 48.00KB
272 gen 505771 top level 5 path var/tmp 272 16.00KB 16.00KB
289 gen 452028 top level 5 path var/lib/machines 289 16.00KB 16.00KB
401 gen 451786 top level 257 path .snapshots/92/snapshot 401 2.81GB 396.91MB
402 gen 465358 top level 257 path .snapshots/93/snapshot 402 2.55GB 9.57MB
403 gen 465363 top level 257 path .snapshots/94/snapshot 403 2.55GB 12.91MB
404 gen 471598 top level 257 path .snapshots/95/snapshot 404 2.54GB 676.00KB
405 gen 471603 top level 257 path .snapshots/96/snapshot 405 2.54GB 660.00KB
406 gen 471658 top level 257 path .snapshots/97/snapshot 406 2.81GB 60.34MB
407 gen 487231 top level 257 path .snapshots/98/snapshot 407 2.55GB 8.66MB
408 gen 490073 top level 257 path .snapshots/99/snapshot 408 2.55GB 4.57MB
409 gen 490081 top level 257 path .snapshots/100/snapshot 409 2.56GB 24.31MB
410 gen 505715 top level 257 path .snapshots/101/snapshot 410 2.55GB 7.28MB
411 gen 505739 top level 257 path .snapshots/102/snapshot 411 2.57GB 20.55MB
===============================================================================================
Exclusive Total: 1.11GB
sftp-host:~ #
–jeroen
Posted in *nix, *nix-tools, btrfs, File-Systems, Power User | Leave a Comment »
Posted by jpluimers on 2019/02/14
Somehow I’ve been doing Unix like work off and on for most of my life. So I know many ancient shell shortcuts (like Ctrl-E for end-of-line and Ctrl-A for start-of-line) by heart.
Many don’t, or even list shortcuts as if they are for the shell, but in fact aren’t.
So here are some links that distinguish between various kinds of keyboard shortcuts and give some insight in the history of these shortcuts (that go back into the 1970s, yes I’m that old).
–jeroen
via:
Posted in *nix, *nix-tools, Development, Power User, Software Development | Leave a Comment »
