Re: Any clue why "df -m" vs. "du -xsAm" get such different results for the tmpfs in question (403 MiBytes vs. 101 MiBytes)?

[I've deleted prior parts of the exchange.]

I finally have a hypothesis with some evidence about what
primarily contributes to the 400 or so "1M-blocks Used" in:

# df -mi /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/
Filesystem 1M-blocks Used Avail Capacity iused   ifree %iused  Mounted on
tmpfs           1024  400   623    39%  103659 3828501    3%   /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p

--where the poudriere-devel is using USE_TMPFS="data" for a
"bulk -a -c" (that has been running for a little over 2 weeks
now and is past 1/3 done).

Taking a quick estimate of the file count in . . ./ref/.p/var/cache/
I get:

# ls -Tla /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/ | wc
   82146  821452 7942485

Taking 82146*4096 I get: 336,470,016
Taking 336,470,016 / 1024 / 1024 I get around: 320 Mi

By contrast:

# du -xsAm /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/
46	/usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/

But:

# du -xsm /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/
295	/usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/

and:

# du -xsm /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/
319	/usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/

This is all after having done a swapoff for the 2 swap partitions
and a swap on for both and then waiting a while with the "bulk -a -c"
still running throughout and after. (So under 82 MiBytes is in
use in swap space at this point.)

poudriere's tmpfs usage reporting does not seem to cover this
area's tmpfs usage. But, at least for "bulk -a -c" kinds of
activity, it ends up being the majority of the tmpfs usage for
USE_TMPFS="data" types of configuration.

For reference:

# ls -Tla /usr/local/poudriere/data/.m/main-CA7-bulk_a-default/ref/.p/var/cache/ | more
total 301234
drwxr-xr-x  2 root  wheel  5257152 May 28 02:31:26 2022 .
drwxr-xr-x  4 root  wheel      128 May 28 01:56:42 2022 ..
-rw-r--r--  1 root  wheel        2 May 28 02:26:40 2022 builder_active%01
-rw-r--r--  1 root  wheel        2 May 28 02:31:24 2022 builder_active%02
-rw-r--r--  1 root  wheel        2 May 28 02:31:26 2022 builder_active%03
-rw-r--r--  1 root  wheel        2 May 28 02:31:26 2022 builder_active%04
-rw-r--r--  1 root  wheel       18 May 28 01:56:51 2022 originspec-pkgname%accessibility_accerciser
-rw-r--r--  1 root  wheel       19 May 28 01:56:51 2022 originspec-pkgname%accessibility_at-spi2-atk
-rw-r--r--  1 root  wheel       20 May 28 01:56:51 2022 originspec-pkgname%accessibility_at-spi2-core
-rw-r--r--  1 root  wheel       11 May 28 01:56:51 2022 originspec-pkgname%accessibility_atk
-rw-r--r--  1 root  wheel       13 May 28 01:56:51 2022 originspec-pkgname%accessibility_atkmm
-rw-r--r--  1 root  wheel       17 May 28 01:56:51 2022 originspec-pkgname%accessibility_caribou
. . .
-rw-r--r--  1 root  wheel       17 May 28 01:56:55 2022 pkgname-originspec%zutils-1.11
-rw-r--r--  1 root  wheel       15 May 28 02:03:32 2022 pkgname-originspec%zxfer-1.1.7
-rw-r--r--  1 root  wheel       14 May 28 02:03:00 2022 pkgname-originspec%zxid-1.42_1
-rw-r--r--  1 root  wheel       19 May 28 02:04:03 2022 pkgname-originspec%zxing-cpp-1.3.0
-rw-r--r--  1 root  wheel       12 May 28 01:59:41 2022 pkgname-originspec%zydis-3.1.0
-rw-r--r--  1 root  wheel       18 May 28 01:57:13 2022 pkgname-originspec%zynaddsubfx-3.0.6,2
-rw-r--r--  1 root  wheel        9 May 28 02:02:07 2022 pkgname-originspec%zyre-2.0.1
-rw-r--r--  1 root  wheel       14 May 28 01:59:41 2022 pkgname-originspec%zziplib-0.13.72_1
-rw-r--r--  1 root  wheel       14 May 28 02:03:00 2022 pkgname-originspec%zzuf-0.13_1
-rw-r--r--  1 root  wheel       13 May 28 01:56:45 2022 ports_metadata%top_git_hash
-rw-r--r--  1 root  wheel        4 May 28 01:56:49 2022 ports_metadata%top_unclean



===
Mark Millard
marklmi at yahoo.com