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witty-crayon-22786

03/14/2023, 9:49 PM
hey folks, quick survey: what does 
df -h $(mktemp)
report on your machine?
on a MacBook Air circa 2020:
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$ df -h $(mktemp)
Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk1s2  932Gi  499Gi  406Gi    56% 5976558 9762001602    0%   /System/Volumes/Data
c

curved-television-6568

03/14/2023, 9:50 PM
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df -h $TMPDIR
Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk3s5  926Gi  229Gi  684Gi    26% 7771220 7167110440    0%   /System/Volumes/Data
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witty-crayon-22786

03/14/2023, 9:50 PM
on an ubuntu 
18.04.5
EC2 node:
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$ df -h $(mktemp)
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p1  125G   76G   49G  62% /
c

curved-television-6568

03/14/2023, 9:52 PM
what was TMPDIR on the ec2 node?
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witty-crayon-22786

03/14/2023, 9:54 PM
…doh. good question. it was undefined. let me update the instructions here.
c

curved-television-6568

03/14/2023, 9:54 PM
on another EC2 
t3a.large
node we have
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tmpfs            3.9G     0  3.9G   0% /dev/shm
tmpfs            788M  832K  787M   1% /run
tmpfs            5.0M     0  5.0M   0% /run/lock
tmpfs            3.9G     0  3.9G   0% /sys/fs/cgroup
no mount point for 
/tmp
but it exists, so guess it belong to root
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/dev/root         12G  4.3G  7.2G  38% /
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witty-crayon-22786

03/14/2023, 9:56 PM
@curved-television-6568: updated the instructions
👀 1
b

bitter-ability-32190

03/14/2023, 9:56 PM
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$ df -h $(mktemp)
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p2  1.9T  550G  1.3T  31% /
Not tempfs, huh
c

curved-television-6568

03/14/2023, 9:57 PM
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ssm-user@ip-10-0-245-77:$ df -h $(mktemp)
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        12G  4.3G  7.2G  38% /
h

happy-kitchen-89482

03/14/2023, 9:57 PM
On my m2:
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$ df -h $(mktemp)
Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk3s5  926Gi  167Gi  728Gi    19% 3667175 7635004040    0%   /System/Volumes/Data
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witty-crayon-22786

03/14/2023, 9:58 PM
from playing with it, 
tmpfs
will fail with 
Os { code: 28, kind: StorageFull, message: "No space left on device" }
rather than overcommitting past its allocated size
w

wide-midnight-78598

03/15/2023, 12:50 AM
2018 Mac Mini (x86)
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% df -h $(mktemp)
Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk1s2  466Gi  353Gi  100Gi    78% 5291240 1045388760    1%   /System/Volumes/Data
👍 1
p

proud-dentist-22844

03/15/2023, 2:51 AM
On my Gentoo Linux box
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$ df -h $(mktemp)
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1       688G  569G   85G  88% /tmp
👍 1
c

curved-manchester-66006

03/15/2023, 1:45 PM
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$ df -h $(mktemp)
Filesystem        Size  Used Avail Use% Mounted on
tank/ROOT/gentoo   42G   26G   16G  62% /
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witty-crayon-22786

03/15/2023, 5:11 PM
thanks everyone! now i am interested in learning the history of moving away from 
tmpfs
for `/tmp`… one hypothesis is that hard drives have gotten fast enough that the downsides of 
tmpfs
(running out of space) outweigh the benefits?
but if anyone knows, please share with the class 😃
😄 1
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