add indexer benchmark + bump default num cores from 4 to 5

and make the mtag deps build better on fedora

bin/mtag/install-deps.sh

@@ -250,8 +250,9 @@ install_vamp() {
 		rm -- *.tar.gz
 		cd beatroot-vamp-v1.0
 		[ -e ~/pe/vamp-sdk ] &&
-			sed -ri 's`^(CFLAGS :=.*)`\1 -I'$HOME'/pe/vamp-sdk/include`' Makefile.linux
-		make -f Makefile.linux -j4 LDFLAGS=-L$HOME/pe/vamp-sdk/lib
+			sed -ri 's`^(CFLAGS :=.*)`\1 -I'$HOME'/pe/vamp-sdk/include`' Makefile.linux ||
+			sed -ri 's`^(CFLAGS :=.*)`\1 -I/usr/include/vamp-sdk`' Makefile.linux
+		make -f Makefile.linux -j4 LDFLAGS="-L$HOME/pe/vamp-sdk/lib -L/usr/lib64"
 		# /home/ed/vamp /home/ed/.vamp /usr/local/lib/vamp
 		mkdir ~/vamp
 		cp -pv beatroot-vamp.* ~/vamp/

copyparty/__main__.py

@@ -1200,7 +1200,10 @@ def run_argparse(
     fk_salt = get_fk_salt(cert_path)
     ah_salt = get_ah_salt()
 
-    hcores = min(CORES, 4)  # optimal on py3.11 @ r5-4500U
+    # alpine peaks at 5 threads for some reason,
+    # all others scale past that (but try to avoid SMT),
+    # 5 should be plenty anyways (3 GiB/s on most machines)
+    hcores = min(CORES, 5 if CORES > 8 else 4)
 
     tty = os.environ.get("TERM", "").lower() == "linux"
 

scripts/bench/filehash.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+set -euo pipefail
+
+# check how fast copyparty is able to hash files during indexing
+# assuming an infinitely fast HDD to read from (alternatively,
+# checks whether you will be bottlenecked by CPU or HDD)
+#
+# uses copyparty's default config of using, well, it's complicated:
+# * if you have more than 8 cores, then 5 threads,
+# * if you have between 4 and 8, then 4 threads,
+# * anything less and it takes your number of cores
+#
+# can be adjusted with --hash-mt (but alpine caps out at 5)
+
+[ $# -ge 1 ] || {
+	echo 'need arg 1: path to copyparty-sfx.py'
+	echo ' (remaining args will be passed on to copyparty,'
+	echo '  for example to tweak the hasher settings)'
+	exit 1
+}
+sfx="$1"
+shift
+sfx="$(realpath "$sfx" || readlink -e "$sfx" || echo "$sfx")"
+awk=$(which gawk || which awk)
+
+# try to use /dev/shm to avoid hitting filesystems at all,
+# otherwise fallback to mktemp which probably uses /tmp
+td=/dev/shm/cppbenchtmp
+mkdir $td || td=$(mktemp -d)
+trap "rm -rf $td" INT TERM EXIT
+cd $td
+
+echo creating 256 MiB testfile in $td
+head -c $((1024*1024*256)) /dev/urandom > 1
+
+echo creating 127 symlinks to it
+for n in $(seq 2 128); do ln -s 1 $n; done
+
+echo warming up cache
+cat 1 >/dev/null
+
+echo ok lets go
+python3 "$sfx" -p39204 -e2dsa --dbd=yolo --exit=idx -lo=t "$@"
+
+echo and the results are...
+$awk '/1 volumes in / {printf "%s MiB/s\n", 256*128/$(NF-1)}' <t
+
+echo deleting $td and exiting
+
+##
+## some results:
+
+# MiB/s @ cpu or device  (copyparty, pythonver, distro/os)  // comment
+
+#  3340 @ Ryzen 5 4500U  (cpp 1.9.5, py 3.11.5, fedora 38)  // --hash-mt=6; laptop
+#  2696 @ Ryzen 5 4500U  (cpp 1.9.5, py 3.11.5, fedora 38)  // --hash-mt=4 (old-default)
+#  2202 @ Ryzen 5 4500U  (cpp 1.9.5, py 3.11.5, docker-alpine 3.18.3) ??? alpine slow
+#  2719 @ Ryzen 5 4500U  (cpp 1.9.5, py 3.11.2, docker-debian 12.1)
+
+#  5544 @ Intel i5-12500 (cpp 1.9.5, py 3.11.2, debian 12.0)  // --hash-mt=12; desktop
+#  5197 @ Ryzen 7 3700X  (cpp 1.9.5, py 3.9.18, freebsd 13.2)  // --hash-mt=8; 2u server
+#  2606 @ Ryzen 7 3700X  (cpp 1.9.5, py 3.9.18, freebsd 13.2)  // --hash-mt=4 (old-default)
+#  1436 @ Ryzen 5 5500U  (cpp 1.9.5, py 3.11.4, alpine 3.18.3)  // nuc
+#  1065 @ Pixel 7        (cpp 1.9.5, py 3.11.5, termux 2023-09)
+
+# notes,
+# podman run --rm -it --shm-size 512m --entrypoint /bin/ash localhost/copyparty-min