From: "Emilio G. Cota" <cota@braap.org>
To: Richard Henderson <rth@twiddle.net>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v4 26/35] tests: add atomic_add-bench
Date: Fri, 16 Sep 2016 19:54:21 -0400 [thread overview]
Message-ID: <20160916235421.GA18670@flamenco> (raw)
In-Reply-To: <1474048017-26696-27-git-send-email-rth@twiddle.net>
On Fri, Sep 16, 2016 at 10:46:48 -0700, Richard Henderson wrote:
> From: "Emilio G. Cota" <cota@braap.org>
>
> With this microbenchmark we can measure the overhead of emulating atomic
> instructions with a configurable degree of contention.
>
> The benchmark spawns $n threads, each performing $o atomic ops (additions)
> in a loop. Each atomic operation is performed on a different cache line
> (assuming lines are 64b long) that is randomly selected from a range [0, $r).
>
> [ Note: each $foo corresponds to a -foo flag ]
Hi Richard,
As I mentioned yesterday I have an updated version of this
patch: http://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03450.html
[ The major change is to run for a certain number of seconds, instead
of a fixed number of operations. ]
I'll send the full updated patch as a reply to this message to make
it easier to pick up.
Thanks,
Emilio
next prev parent reply other threads:[~2016-09-16 23:54 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 17:46 [Qemu-devel] [PATCH v4 00/35] cmpxchg-based emulation of atomics Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 01/35] atomics: add atomic_xor Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 02/35] atomics: add atomic_op_fetch variants Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 03/35] exec: Avoid direct references to Int128 parts Richard Henderson
2016-10-04 8:44 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 04/35] int128: Use __int128 if available Richard Henderson
2016-10-04 8:45 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 05/35] int128: Add int128_make128 Richard Henderson
2016-10-04 8:46 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 07/35] HACK: Always enable parallel_cpus Richard Henderson
2016-10-04 13:29 ` Alex Bennée
2016-10-05 18:17 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 08/35] cputlb: Replace SHIFT with DATA_SIZE Richard Henderson
2016-10-04 8:47 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 09/35] cputlb: Move probe_write out of softmmu_template.h Richard Henderson
2016-10-04 8:47 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 10/35] cputlb: Remove includes from softmmu_template.h Richard Henderson
2016-10-04 8:49 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 11/35] cputlb: Move most of iotlb code out of line Richard Henderson
2016-10-04 11:00 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 12/35] cputlb: Tidy some macros Richard Henderson
2016-10-04 11:07 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 13/35] tcg: Add atomic helpers Richard Henderson
2016-10-03 19:42 ` Alex Bennée
2016-10-05 0:02 ` Emilio G. Cota
2016-10-05 11:17 ` Alex Bennée
2016-10-05 18:08 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 14/35] tcg: Add atomic128 helpers Richard Henderson
2016-10-05 11:44 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 15/35] tcg: Add CONFIG_ATOMIC64 Richard Henderson
2016-10-04 15:47 ` Alex Bennée
2016-10-04 15:58 ` Peter Maydell
2016-10-05 17:49 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 16/35] tcg: Emit barriers with parallel_cpus Richard Henderson
2016-10-05 11:44 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 17/35] target-i386: emulate LOCK'ed cmpxchg using cmpxchg helpers Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 18/35] target-i386: emulate LOCK'ed OP instructions using atomic helpers Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 19/35] target-i386: emulate LOCK'ed INC using atomic helper Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 20/35] target-i386: emulate LOCK'ed NOT " Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 21/35] target-i386: emulate LOCK'ed NEG using cmpxchg helper Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 22/35] target-i386: emulate LOCK'ed XADD using atomic helper Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 23/35] target-i386: emulate LOCK'ed BTX ops using atomic helpers Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 24/35] target-i386: emulate XCHG using atomic helper Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 25/35] target-i386: remove helper_lock() Richard Henderson
2016-10-05 11:46 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 26/35] tests: add atomic_add-bench Richard Henderson
2016-09-16 23:54 ` Emilio G. Cota [this message]
2016-09-16 23:57 ` [Qemu-devel] [PATCH] " Emilio G. Cota
2016-09-17 1:01 ` [Qemu-devel] [PATCH v4 26/35] " Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 27/35] target-arm: Rearrange aa32 load and store functions Richard Henderson
2016-10-05 13:37 ` Alex Bennée
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 28/35] target-arm: emulate LL/SC using cmpxchg helpers Richard Henderson
2016-10-05 13:40 ` Alex Bennée
2016-10-05 17:41 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 29/35] target-arm: emulate SWP with atomic_xchg helper Richard Henderson
2016-10-05 13:35 ` Alex Bennée
2016-10-05 17:44 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 30/35] target-arm: emulate aarch64's LL/SC using cmpxchg helpers Richard Henderson
2016-09-17 0:16 ` Emilio G. Cota
2016-09-17 0:40 ` Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 31/35] linux-user: remove handling of ARM's EXCP_STREX Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 32/35] linux-user: remove handling of aarch64's EXCP_STREX Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 33/35] target-arm: remove EXCP_STREX + cpu_exclusive_{test, info} Richard Henderson
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 34/35] target-alpha: Introduce MMU_PHYS_IDX Richard Henderson
2016-10-05 0:11 ` Emilio G. Cota
2016-09-16 17:46 ` [Qemu-devel] [PATCH v4 35/35] target-alpha: Emulate LL/SC using cmpxchg helpers Richard Henderson
2016-10-05 0:11 ` Emilio G. Cota
2016-10-03 19:19 ` [Qemu-devel] [PATCH v4 00/35] cmpxchg-based emulation of atomics Alex Bennée
2016-10-05 13:43 ` Alex Bennée
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160916235421.GA18670@flamenco \
--to=cota@braap.org \
--cc=qemu-devel@nongnu.org \
--cc=rth@twiddle.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).