# Linux singer 6.12.40-0-lts x86_64
# /dev/shm and /tmp are tmpfs
# as user, nsm here:
#   touch /dev/shm/mempool.dat.new
# as root:
#   cd /home/nsm/.bitcoin
#   mount -o rw,bind /dev/shm/mempool.dat.new mempool.dat.new
# everything else here that follows
# is run as an unprivileged user
+ date -u
Mon Sep 15 02:32:34 UTC 2025
+ head -1
+ bitcoind -version
Bitcoin Core daemon version v29.99.0-5103a96f40b7
+ bitcoin-cli echo hello
+ grep .
[
  "hello"
]
+ mountpoint /home/nsm/.bitcoin/mempool.dat.new
/home/nsm/.bitcoin/mempool.dat.new is a mountpoint
+ bitcoin-cli getmempoolinfo
+ nicecat.sh /tmp/gmi-main.json
{
  "loaded": true,
  "size": 65980,
  "bytes": 41674100,
  "usage": 231069696,
  "total_fee": 0.07442830,
  "maxmempool": 300000000,
  "mempoolminfee": 0.00000001,
  "minrelaytxfee": 0.00000001,
  "incrementalrelayfee": 0.00000001,
  "unbroadcastcount": 0,
  "fullrbf": true,
  "permitbaremultisig": true,
  "maxdatacarriersize": 512
}
+ : following is getrawmempool, just shortened
+ grm.sh
+ safecat.sh /dev/shm/mymempool.txt
+ : Following non-zero exit is intended.
+ : On bitcoind side it looks like this:
+ : Failed to dump mempool: Rename failed. Continuing anyway.
+ time bitcoin-cli savemempool
error code: -1
error message:
Unable to dump mempool to disk
Command exited with non-zero status 1
real	0m 1.01s
user	0m 0.00s
sys	0m 0.00s
+ f=/dev/shm/mempool.dat.new
+ t=/dev/shm/mempool.dat.tmp
+ cp /dev/shm/mempool.dat.new /dev/shm/mempool.dat.tmp
+ : UNIX fixes this, file descriptor stays
+ : i n memory when used even after file was
+ : successfully unlinked from filesystem
+ : GNU is Not Unix anyway
+ mv /dev/shm/mempool.dat.tmp /dev/shm/mempool.copy
+ ln -s /dev/shm/mempool.copy /dev/shm/mempool.copy.dat
ln: failed to create symbolic link '/dev/shm/mempool.copy.dat': File exists
+ cd /dev/shm
+ ls -ilh mempool.copy mempool.dat.new
554583 -rw-r--r-- 1 nsm nsm 124M Sep 15 02:32 mempool.copy
   152 -rw-r--r-- 1 nsm nsm 124M Sep 15 02:32 mempool.dat.new
+ cd /home/nsm/web/ln
+ ls -l mymempool-log.txt mymempool.dat mymempool.txt mymempoolhere.sh.txt
lrwxrwxrwx 1 nsm nsm   22 Feb 21  2025 mymempool-log.txt -> /dev/shm/mymempool.log
lrwxrwxrwx 1 nsm nsm   21 Dec 10  2024 mymempool.dat -> /dev/shm/mempool.copy
lrwxrwxrwx 1 nsm nsm   22 Feb 18  2025 mymempool.txt -> /dev/shm/mymempool.txt
-rwx------ 1 nsm nsm 1445 May 14 16:46 mymempoolhere.sh.txt
+ date -u
Mon Sep 15 02:32:36 UTC 2025