From 03ca96ccc3fb2679ef1142d9c2d9752e97902212 Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Sun, 31 Oct 2021 06:24:11 +0100
Subject: [PATCH] performance tips

---
 README.md     | 16 ++++++++++++++++
 docs/notes.sh |  7 +++++++
 2 files changed, 23 insertions(+)

diff --git a/README.md b/README.md
index 72487a45..2dc79938 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,7 @@ turn your phone or raspi into a portable file server with resumable uploads/down
 * [up2k](#up2k) - quick outline of the up2k protocol, see [uploading](#uploading) for the web-client
     * [why chunk-hashes](#why-chunk-hashes) - a single sha512 would be better, right?
 * [performance](#performance) - defaults are usually fine - expect `8 GiB/s` download, `1 GiB/s` upload
+    * [client-side](#client-side) - when uploading files
 * [security](#security) - some notes on hardening
     * [gotchas](#gotchas) - behavior that might be unexpected
 * [recovering from crashes](#recovering-from-crashes)
@@ -860,6 +861,21 @@ below are some tweaks roughly ordered by usefulness:
   ...however it adds an overhead to internal communication so it might be a net loss, see if it works 4 u
 
 
+## client-side
+
+when uploading files,
+
+* chrome is recommended, at least compared to firefox:
+  * up to 90% faster when hashing, especially on SSDs
+  * up to 40% faster when uploading over extremely fast internets
+  * but [up2k.py](https://github.com/9001/copyparty/blob/hovudstraum/bin/up2k.py) can be 40% faster than chrome again
+
+* if you're cpu-bottlenecked, or the browser is maxing a cpu core:
+  * up to 30% faster uploads if you hide the upload status list by switching away from the `[🚀]` up2k ui-tab (or closing it)
+    * switching to another browser-tab also works but that makes firefox stop updating the favicon
+  * unlikely to be a problem, but can happen when uploding many small files, or your internet is too fast, or PC too slow
+
+
 # security
 
 some notes on hardening
diff --git a/docs/notes.sh b/docs/notes.sh
index 4e6a715a..968c63c7 100644
--- a/docs/notes.sh
+++ b/docs/notes.sh
@@ -38,6 +38,13 @@ para() { for s in 1 2 3 4 5 6 7 8 12 16 24 32 48 64; do echo $s; for r in {1..4}
 avg() { awk 'function pr(ncsz) {if (nsmp>0) {printf "%3s %s\n", csz, sum/nsmp} csz=$1;sum=0;nsmp=0} {sub(/\r$/,"")} /^[0-9]+$/ {pr($1);next} / MiB/ {sub(/ MiB.*/,"");sub(/.* /,"");sum+=$1;nsmp++} END {pr(0)}' "$1"; }
 
 
+##
+## time between first and last upload
+
+python3 -um copyparty -nw -v srv::rw -i 127.0.0.1 2>&1 | tee log 
+cat log | awk '!/"purl"/{next} {s=$1;sub(/[^m]+m/,"");gsub(/:/," ");t=60*(60*$1+$2)+$3} !a{a=t;sa=s} {b=t;sb=s} END {print b-a,sa,sb}'
+
+
 ##
 ## bad filenames