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--- public:stuff [2022/10/07 00:26]
canvon Add Windows fork problems, with a link to (blog about ansible which linked me to) CygWin highlights: Process Creation
+++ public:stuff [2022/10/19 00:47] (current)
canvon [Speed test] Fix breaking the following section
@@ Line 1: / Line 1: @@
 ====== Stuff ======
-Some miscellaneous stuff that doesn't fit otherwise into the structure...
+Some miscellaneous stuff that doesn't fit otherwise into [[.:start|the structure]]...
-For example, [[#speed_test|speed test by ''timeout'' + ''dd'']], [[#windows_fork_problems]]...
+For example, [[#speed_test|speed test by ''timeout'' + ''dd'']], [[#video_file_comparison_using_mpv|video file comparison using mpv]], [[#windows_fork_problems|Windows fork problems]]...
@@ Line 11: / Line 11: @@
 root@ubuntu:~# timeout --foreground -s INT 60s dd if=/dev/sda bs=4096 of=/dev/null  # ad-hoc USB3 storage speed test...
 </code>
+The idea is to not measure transfer duration of a fixed size, but to let it run through until a fixed time has passed (and then look at the transfer speed). For this, we wrap the ''dd'' invocation into the ''timeout'' command.
+The problem, then, was that ''dd'' didn't output **anything** when run under ''timeout''.
+The solution was to use //both// of ''--foreground'' and ''-s INT'' (after the timeout expires, fire signal SIGINT at the wrapped process) //together//. This restored dd's output-at-end, which will now tell the overall transfer speed, as previously expected.
+===== Video file comparison using mpv =====
+To just get the console output of ''mpv'' where it describes the file played (so we can run a wdiff over the saved outputs of similar files): (Previously, it used to be ''mplayer --identify'' or somesuch.)
+<code>
+$ mpv --vo=null --ao=null --frames=1 ...
+</code>
 ===== Windows fork problems =====

canvon notes

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