* [libre-riscv-dev] Fwd: [OpenPOWER-HDL-Cores] POWER9 ISA opcode usage statistics
[not found] ` <CAO3ALPwjLPh8y_UAucNxZ0Zc9TjgQZmPgTq8M4fuQLhiUioThg@mail.gmail.com>
@ 2020-05-24 1:01 ` Luke Kenneth Casson Leighton
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From: Luke Kenneth Casson Leighton @ 2020-05-24 1:01 UTC (permalink / raw)
To: Libre-RISCV General Development
can someone please capture this in a bugreport?
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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
---------- Forwarded message ---------
From: Forest Crossman <cyrozap@gmail.com>
Date: Sun, May 24, 2020 at 12:31 AM
Subject: Re: [OpenPOWER-HDL-Cores] POWER9 ISA opcode usage statistics
To: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Cc: <openpower-hdl-cores@mailinglist.openpowerfoundation.org>
> whilst i appreciate that these statistics will be use-case-specific
> for certain workloads, does anyone know of any studies that have
> already been done, or of any libre-licensed tools that help with the
> same?
I realize it's been over three weeks since you posted this question,
so maybe you've found an answer already, but I had an idea on how to
do it so I decided to try it. I ended up with the following bash
script: https://paste.debian.net/hidden/10201ca1
I ran that script on my Talos II running Debian 8 and got the
following results: https://paste.debian.net/hidden/13696b59
Note that Debian for ppc64el is built without `-mcpu=power9`, so these
statistics won't include any POWER9 instructions. If you want to get
the stats for that, you'll want to build Debian (or another popular
distro) with the `-mcpu=power9` flag to make sure the POWER9
instructions and optimizations are enabled. It also might be a good
idea to gather instruction statistics for the kernel as well, since
kernel code might have a different distribution than the userspace
code I sampled.
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